Merge branch 'master' into scripting

Conflicts:
	src/actor.h
	src/fragglescript/t_func.cpp
	src/g_doom/a_bossbrain.cpp
	src/g_doom/a_revenant.cpp
	src/g_heretic/a_hereticartifacts.cpp
	src/g_heretic/a_hereticweaps.cpp
	src/g_heretic/a_knight.cpp
	src/g_hexen/a_bishop.cpp
	src/g_hexen/a_clericholy.cpp
	src/g_hexen/a_dragon.cpp
	src/g_hexen/a_firedemon.cpp
	src/g_hexen/a_flechette.cpp
	src/g_hexen/a_heresiarch.cpp
	src/g_hexen/a_hexenspecialdecs.cpp
	src/g_hexen/a_iceguy.cpp
	src/g_hexen/a_korax.cpp
	src/g_hexen/a_magelightning.cpp
	src/g_hexen/a_serpent.cpp
	src/g_hexen/a_spike.cpp
	src/g_hexen/a_wraith.cpp
	src/g_raven/a_minotaur.cpp
	src/g_shared/a_bridge.cpp
	src/g_shared/a_pickups.cpp
	src/g_shared/a_randomspawner.cpp
	src/g_strife/a_alienspectres.cpp
	src/g_strife/a_crusader.cpp
	src/g_strife/a_entityboss.cpp
	src/g_strife/a_inquisitor.cpp
	src/g_strife/a_loremaster.cpp
	src/g_strife/a_programmer.cpp
	src/g_strife/a_sentinel.cpp
	src/g_strife/a_spectral.cpp
	src/g_strife/a_strifestuff.cpp
	src/g_strife/a_strifeweapons.cpp
	src/g_strife/a_thingstoblowup.cpp
	src/p_local.h
	src/r_utility.cpp

src/GuillotineBinPack.cpp

@@ -144,7 +144,9 @@ void GuillotineBinPack::Insert(TArray<RectSize> &rects, TArray<Rect> &dst, bool
 		usedRectangles.Push(newNode);
 
 		// Check that we're really producing correct packings here.
+#ifdef _DEBUG
 		assert(disjointRects.Add(newNode) == true);
+#endif
 	}
 }
 
@@ -355,8 +357,9 @@ Rect GuillotineBinPack::Insert(int width, int height, bool merge, FreeRectChoice
 	usedRectangles.Push(newRect);
 
 	// Check that we're really producing correct packings here.
+#ifdef _DEBUG
 	assert(disjointRects.Add(newRect) == true);
-
+#endif
 	return newRect;
 }
 
@@ -442,7 +445,9 @@ Rect GuillotineBinPack::FindPositionForNewNode(int width, int height, FreeRectCh
 			bestNode.height = height;
 			bestScore = INT_MIN;
 			*nodeIndex = i;
+#ifdef _DEBUG
 			assert(disjointRects.Disjoint(bestNode));
+#endif
 			break;
 		}
 		// If this is a perfect fit sideways, choose it.
@@ -470,7 +475,9 @@ Rect GuillotineBinPack::FindPositionForNewNode(int width, int height, FreeRectCh
 				bestNode.height = height;
 				bestScore = score;
 				*nodeIndex = i;
+#ifdef _DEBUG
 				assert(disjointRects.Disjoint(bestNode));
+#endif
 			}
 		}
 		// Does the rectangle fit sideways?
@@ -575,8 +582,10 @@ void GuillotineBinPack::SplitFreeRectAlongAxis(const Rect &freeRect, const Rect
 	if (right.width > 0 && right.height > 0)
 		freeRectangles.Push(right);
 
+#ifdef _DEBUG
 	assert(disjointRects.Disjoint(bottom));
 	assert(disjointRects.Disjoint(right));
+#endif
 }
 
 void GuillotineBinPack::MergeFreeList()

src/SkylineBinPack.cpp

@@ -69,7 +69,9 @@ void SkylineBinPack::Insert(TArray<RectSize> &rects, TArray<Rect> &dst)
 			int score2;
 			int index;
 			newNode = FindPositionForNewNodeMinWaste(rects[i].width, rects[i].height, score2, score1, index);
+#ifdef _DEBUG
 			assert(disjointRects.Disjoint(newNode));
+#endif
 			if (newNode.height != 0)
 			{
 				if (score1 < bestScore1 || (score1 == bestScore1 && score2 < bestScore2))
@@ -87,8 +89,8 @@ void SkylineBinPack::Insert(TArray<RectSize> &rects, TArray<Rect> &dst)
 			return;
 
 		// Perform the actual packing.
-		assert(disjointRects.Disjoint(bestNode));
 #ifdef _DEBUG
+		assert(disjointRects.Disjoint(bestNode));
 		disjointRects.Add(bestNode);
 #endif
 		AddSkylineLevel(bestSkylineIndex, bestNode);
@@ -103,7 +105,9 @@ Rect SkylineBinPack::Insert(int width, int height)
 	// First try to pack this rectangle into the waste map, if it fits.
 	Rect node = wasteMap.Insert(width, height, true, GuillotineBinPack::RectBestShortSideFit, 
 		GuillotineBinPack::SplitMaximizeArea);
+#ifdef _DEBUG
 	assert(disjointRects.Disjoint(node));
+#endif
 
 	if (node.height != 0)
 	{
@@ -113,8 +117,8 @@ Rect SkylineBinPack::Insert(int width, int height)
 		newNode.width = node.width;
 		newNode.height = node.height;
 		usedSurfaceArea += width * height;
-		assert(disjointRects.Disjoint(newNode));
 #ifdef _DEBUG
+		assert(disjointRects.Disjoint(newNode));
 		disjointRects.Add(newNode);
 #endif
 		return newNode;
@@ -190,7 +194,9 @@ void SkylineBinPack::AddWasteMapArea(int skylineNodeIndex, int width, int height
 		waste.width = rightSide - leftSide;
 		waste.height = y - skyLine[skylineNodeIndex].y;
 
+#ifdef _DEBUG
 		assert(disjointRects.Disjoint(waste));
+#endif
 		wasteMap.GetFreeRectangles().Push(waste);
 	}
 }
@@ -264,7 +270,9 @@ Rect SkylineBinPack::InsertBottomLeft(int width, int height)
 
 	if (bestIndex != -1)
 	{
+#ifdef _DEBUG
 		assert(disjointRects.Disjoint(newNode));
+#endif
 		// Perform the actual packing.
 		AddSkylineLevel(bestIndex, newNode);
 
@@ -300,7 +308,9 @@ Rect SkylineBinPack::FindPositionForNewNodeBottomLeft(int width, int height, int
 				newNode.y = y;
 				newNode.width = width;
 				newNode.height = height;
+#ifdef _DEBUG
 				assert(disjointRects.Disjoint(newNode));
+#endif
 			}
 		}
 /*		if (RectangleFits(i, height, width, y))
@@ -331,7 +341,9 @@ Rect SkylineBinPack::InsertMinWaste(int width, int height)
 
 	if (bestIndex != -1)
 	{
+#ifdef _DEBUG
 		assert(disjointRects.Disjoint(newNode));
+#endif
 		// Perform the actual packing.
 		AddSkylineLevel(bestIndex, newNode);
 
@@ -369,7 +381,9 @@ Rect SkylineBinPack::FindPositionForNewNodeMinWaste(int width, int height, int &
 				newNode.y = y;
 				newNode.width = width;
 				newNode.height = height;
+#ifdef _DEBUG
 				assert(disjointRects.Disjoint(newNode));
+#endif
 			}
 		}
 /*		if (RectangleFits(i, height, width, y, wastedArea))

src/actor.h

@@ -924,23 +924,43 @@ public:
 		return ret;
 	}
 
-	fixedvec2 Vec2Offset(fixed_t dx, fixed_t dy) const
+	fixedvec2 Vec2Offset(fixed_t dx, fixed_t dy, bool absolute = false) const
 	{
 		fixedvec2 ret = { x + dx, y + dy };
 		return ret;
 	}
 
-	fixedvec3 Vec3Offset(fixed_t dx, fixed_t dy, fixed_t dz) const
+
+	fixedvec2 Vec2Angle(fixed_t length, angle_t angle, bool absolute = false) const
+	{
+		fixedvec2 ret = { x + FixedMul(length, finecosine[angle >> ANGLETOFINESHIFT]),
+						  y + FixedMul(length, finesine[angle >> ANGLETOFINESHIFT]) };
+		return ret;
+	}
+
+	fixedvec3 Vec3Offset(fixed_t dx, fixed_t dy, fixed_t dz, bool absolute = false) const
 	{
 		fixedvec3 ret = { x + dx, y + dy, z + dz };
 		return ret;
 	}
 
+	fixedvec3 Vec3Angle(fixed_t length, angle_t angle, fixed_t dz, bool absolute = false) const
+	{
+		fixedvec3 ret = { x + FixedMul(length, finecosine[angle >> ANGLETOFINESHIFT]),
+						  y + FixedMul(length, finesine[angle >> ANGLETOFINESHIFT]), z + dz };
+		return ret;
+	}
+
 	void Move(fixed_t dx, fixed_t dy, fixed_t dz)
 	{
 		SetOrigin(x + dx, y + dy, z + dz, true);
 	}
 
+	void SetOrigin(const fixedvec3 & npos, bool moving)
+	{
+		SetOrigin(npos.x, npos.y, npos.z, moving);
+	}
+
 	inline void SetFriendPlayer(player_t *player);
 
 	bool IsVisibleToPlayer() const;
@@ -1200,10 +1220,50 @@ public:
 	{
 		return z;
 	}
-	void SetZ(fixed_t newz)
+	fixedvec3 Pos() const
+	{
+		fixedvec3 ret = { X(), Y(), Z() };
+		return ret;
+	}
+	fixedvec3 InterpolatedPosition(fixed_t ticFrac) const
+	{
+		fixedvec3 ret;
+
+		ret.x = PrevX + FixedMul (ticFrac, X() - PrevX);
+		ret.y = PrevY + FixedMul (ticFrac, Y() - PrevY);
+		ret.z = PrevZ + FixedMul (ticFrac, Z() - PrevZ);
+		return ret;
+	}
+	fixedvec3 PosPlusZ(fixed_t zadd) const
+	{
+		fixedvec3 ret = { X(), Y(), Z() + zadd };
+		return ret;
+	}
+	fixed_t Top() const
+	{
+		return z + height;
+	}
+	void SetZ(fixed_t newz, bool moving = true)
 	{
 		z = newz;
 	}
+	void AddZ(fixed_t newz, bool moving = true)
+	{
+		z += newz;
+	}
+
+	// These are not for general use as they do not link the actor into the world!
+	void SetXY(fixed_t xx, fixed_t yy)
+	{
+		x = xx;
+		y = yy;
+	}
+	void SetXYZ(fixed_t xx, fixed_t yy, fixed_t zz)
+	{
+		x = xx;
+		y = yy;
+		z = zz;
+	}
 
 };
 
@@ -1308,6 +1368,14 @@ inline T *Spawn (const fixedvec3 &pos, replace_t allowreplacement)
 	return static_cast<T *>(AActor::StaticSpawn (RUNTIME_CLASS(T), pos.x, pos.y, pos.z, allowreplacement));
 }
 
+inline fixedvec2 Vec2Angle(fixed_t length, angle_t angle) 
+{
+	fixedvec2 ret = { FixedMul(length, finecosine[angle >> ANGLETOFINESHIFT]),
+						FixedMul(length, finesine[angle >> ANGLETOFINESHIFT]) };
+	return ret;
+}
+
+
 void PrintMiscActorInfo(AActor * query);
 
 #define S_FREETARGMOBJ	1

src/b_func.cpp

@@ -459,7 +459,7 @@ void FCajunMaster::SetBodyAt (fixed_t x, fixed_t y, fixed_t z, int hostnum)
 //Emulates missile travel. Returns distance travelled.
 fixed_t FCajunMaster::FakeFire (AActor *source, AActor *dest, ticcmd_t *cmd)
 {
-	AActor *th = Spawn ("CajunTrace", source->X(), source->Y(), source->Z() + 4*8*FRACUNIT, NO_REPLACE);
+	AActor *th = Spawn ("CajunTrace", source->PosPlusZ(4*8*FRACUNIT), NO_REPLACE);
 	
 	th->target = source;		// where it came from
 

src/d_dehacked.cpp

@@ -3091,7 +3091,7 @@ bool ADehackedPickup::TryPickup (AActor *&toucher)
 	{
 		return false;
 	}
-	RealPickup = static_cast<AInventory *>(Spawn (type, X(), Y(), Z(), NO_REPLACE));
+	RealPickup = static_cast<AInventory *>(Spawn (type, Pos(), NO_REPLACE));
 	if (RealPickup != NULL)
 	{
 		// The internally spawned item should never count towards statistics.

src/d_net.cpp

@@ -2319,10 +2319,7 @@ void Net_DoCommand (int type, BYTE **stream, int player)
 					else
 					{
 						const AActor *def = GetDefaultByType (typeinfo);
-						fixedvec3 spawnpos = source->Vec3Offset(
-							FixedMul (def->radius * 2 + source->radius, finecosine[source->angle>>ANGLETOFINESHIFT]),
-							FixedMul (def->radius * 2 + source->radius, finesine[source->angle>>ANGLETOFINESHIFT]),
-							8 * FRACUNIT);
+						fixedvec3 spawnpos = source->Vec3Angle(def->radius * 2 + source->radius, source->angle, 8 * FRACUNIT);
 
 						AActor *spawned = Spawn (typeinfo, spawnpos, ALLOW_REPLACE);
 						if (spawned != NULL)
@@ -2376,7 +2373,7 @@ void Net_DoCommand (int type, BYTE **stream, int player)
 			s = ReadString (stream);
 
 			if (Trace (players[player].mo->X(), players[player].mo->Y(),
-				players[player].mo->Z() + players[player].mo->height - (players[player].mo->height>>2),
+				players[player].mo->Top() - (players[player].mo->height>>2),
 				players[player].mo->Sector,
 				vx, vy, vz, 172*FRACUNIT, 0, ML_BLOCKEVERYTHING, players[player].mo,
 				trace, TRACE_NoSky))

src/fragglescript/t_func.cpp

@@ -982,7 +982,7 @@ void FParser::SF_ObjX(void)
 	}
 
 	t_return.type = svt_fixed;           // haleyjd: SoM's fixed-point fix
-	t_return.value.f = mo ? mo->x : 0;   // null ptr check
+	t_return.value.f = mo ? mo->X() : 0;   // null ptr check
 }
 
 //==========================================================================
@@ -1005,7 +1005,7 @@ void FParser::SF_ObjY(void)
 	}
 
 	t_return.type = svt_fixed;         // haleyjd
-	t_return.value.f = mo ? mo->y : 0; // null ptr check
+	t_return.value.f = mo ? mo->Y() : 0; // null ptr check
 }
 
 //==========================================================================
@@ -1028,7 +1028,7 @@ void FParser::SF_ObjZ(void)
 	}
 
 	t_return.type = svt_fixed;         // haleyjd
-	t_return.value.f = mo ? mo->z : 0; // null ptr check
+	t_return.value.f = mo ? mo->Z() : 0; // null ptr check
 }
 
 
@@ -1466,8 +1466,8 @@ void FParser::SF_SetCamera(void)
 		angle = t_argc < 2 ? newcamera->angle : (fixed_t)FixedToAngle(fixedvalue(t_argv[1]));
 
 		newcamera->special1=newcamera->angle;
-		newcamera->special2=newcamera->z;
-		newcamera->z = t_argc < 3 ? (newcamera->z + (41 << FRACBITS)) : (intvalue(t_argv[2]) << FRACBITS);
+		newcamera->special2=newcamera->Z();
+		newcamera->SetZ(t_argc < 3 ? (newcamera->Z() + (41 << FRACBITS)) : (intvalue(t_argv[2]) << FRACBITS));
 		newcamera->angle = angle;
 		if(t_argc < 4) newcamera->pitch = 0;
 		else
@@ -1498,7 +1498,7 @@ void FParser::SF_ClearCamera(void)
 	{
 		player->camera=player->mo;
 		cam->angle=cam->special1;
-		cam->z=cam->special2;
+		cam->SetZ(cam->special2);
 	}
 
 }
@@ -3065,7 +3065,7 @@ void FParser::SF_SetWeapon()
 void FParser::SF_MoveCamera(void)
 {
 	fixed_t    x, y, z;  
-	fixed_t    xdist, ydist, zdist, xydist, movespeed;
+	fixed_t    zdist, xydist, movespeed;
 	fixed_t    xstep, ystep, zstep, targetheight;
 	angle_t    anglespeed, anglestep, angledist, targetangle, 
 		mobjangle, bigangle, smallangle;
@@ -3097,9 +3097,8 @@ void FParser::SF_MoveCamera(void)
 		anglespeed   = (angle_t)FixedToAngle(fixedvalue(t_argv[5]));
 		
 		// figure out how big one step will be
-		xdist = target->x - cam->x;
-		ydist = target->y - cam->y;
-		zdist = targetheight - cam->z;
+		fixedvec2 dist = cam->Vec2To(target);
+		zdist = targetheight - cam->Z();
 		
 		// Angle checking...  
 		//    90  
@@ -3170,19 +3169,19 @@ void FParser::SF_MoveCamera(void)
 		else
 			anglestep = anglespeed;
 		
-		if(abs(xstep) >= (abs(xdist) - 1))
-			x = target->x;
+		if(abs(xstep) >= (abs(dist.x) - 1))
+			x = cam->X() + dist.x;
 		else
 		{
-			x = cam->x + xstep;
+			x = cam->X() + xstep;
 			moved = 1;
 		}
 		
-		if(abs(ystep) >= (abs(ydist) - 1))
-			y = target->y;
+		if(abs(ystep) >= (abs(dist.y) - 1))
+			y = cam->Y() + dist.y;
 		else
 		{
-			y = cam->y + ystep;
+			y = cam->Y() + ystep;
 			moved = 1;
 		}
 		
@@ -3190,7 +3189,7 @@ void FParser::SF_MoveCamera(void)
 			z = targetheight;
 		else
 		{
-			z = cam->z + zstep;
+			z = cam->Z() + zstep;
 			moved = 1;
 		}
 		
@@ -3212,12 +3211,12 @@ void FParser::SF_MoveCamera(void)
 
 		cam->radius=8;
 		cam->height=8;
-		if ((x != cam->x || y != cam->y) && !P_TryMove(cam, x, y, true))
+		if ((x != cam->X() || y != cam->Y()) && !P_TryMove(cam, x, y, true))
 		{
 			Printf("Illegal camera move to (%f, %f)\n", x/65536.f, y/65536.f);
 			return;
 		}
-		cam->z = z;
+		cam->SetZ(z);
 
 		t_return.type = svt_int;
 		t_return.value.i = moved;
@@ -3410,13 +3409,10 @@ void FParser::SF_SetObjPosition()
 
 		if (!mobj) return;
 
-		mobj->UnlinkFromWorld();
-
-		mobj->x = intvalue(t_argv[1]) << FRACBITS;
-		if(t_argc >= 3) mobj->y = intvalue(t_argv[2]) << FRACBITS;
-		if(t_argc == 4)	mobj->z = intvalue(t_argv[3]) << FRACBITS;
-
-		mobj->LinkToWorld();
+		mobj->SetOrigin(
+			fixedvalue(t_argv[1]),
+			(t_argc >= 3)? fixedvalue(t_argv[2]) : mobj->Y(),
+			(t_argc >= 4)? fixedvalue(t_argv[3]) : mobj->Z(), false);
 	}
 }
 
@@ -4285,7 +4281,7 @@ void FParser::SF_SpawnShot2(void)
 		
 		t_return.type = svt_mobj;
 
-		AActor *mo = Spawn (pclass, source->x, source->y, source->z+z, ALLOW_REPLACE);
+		AActor *mo = Spawn (pclass, source->PosPlusZ(z), ALLOW_REPLACE);
 		if (mo) 
 		{
 			S_Sound (mo, CHAN_VOICE, mo->SeeSound, 1, ATTN_NORM);

src/g_doom/a_archvile.cpp

@@ -59,7 +59,6 @@ DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_Fire)
 void A_Fire(AActor *self, int height)
 {
 	AActor *dest;
-	angle_t an;
 				
 	dest = self->tracer;
 	if (dest == NULL || self->target == NULL)
@@ -69,11 +68,8 @@ void A_Fire(AActor *self, int height)
 	if (!P_CheckSight (self->target, dest, 0) )
 		return;
 
-	an = dest->angle >> ANGLETOFINESHIFT;
-
-	self->SetOrigin (dest->x + FixedMul (24*FRACUNIT, finecosine[an]),
-					 dest->y + FixedMul (24*FRACUNIT, finesine[an]),
-					 dest->z + height);
+	fixedvec3 newpos = dest->Vec3Angle(24 * FRACUNIT, dest->angle, height);
+	self->SetOrigin(newpos, true);
 }
 
 
@@ -94,8 +90,7 @@ DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_VileTarget)
 
 	A_FaceTarget (self);
 
-	fog = Spawn (fire, self->target->x, self->target->y,
-		self->target->z, ALLOW_REPLACE);
+	fog = Spawn (fire, self->target->Pos(), ALLOW_REPLACE);
 	
 	self->tracer = fog;
 	fog->target = self;
@@ -126,7 +121,6 @@ DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_VileAttack)
 	PARAM_INT_OPT	(flags)		{ flags = 0; }
 
 	AActor *fire, *target;
-	angle_t an;
 		
 	if (NULL == (target = self->target))
 		return 0;
@@ -148,15 +142,13 @@ DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_VileAttack)
 
 	P_TraceBleed (newdam > 0 ? newdam : dmg, target);
 		
-	an = self->angle >> ANGLETOFINESHIFT;
 	fire = self->tracer;
 
 	if (fire != NULL)
 	{
 		// move the fire between the vile and the player
-		fire->SetOrigin (target->x - FixedMul (24*FRACUNIT, finecosine[an]),
-						 target->y - FixedMul (24*FRACUNIT, finesine[an]),
-						 target->z);
+		fixedvec3 pos = target->Vec3Angle(-24 * FRACUNIT, self->angle, target->Z());
+		fire->SetOrigin (pos, true);
 		
 		P_RadiusAttack (fire, self, blastdmg, blastrad, dmgtype, 0);
 	}

src/g_doom/a_bossbrain.cpp

@@ -59,9 +59,9 @@ DEFINE_ACTION_FUNCTION(AActor, A_BrainScream)
 	PARAM_ACTION_PROLOGUE;
 	fixed_t x;
 		
-	for (x = self->x - 196*FRACUNIT; x < self->x + 320*FRACUNIT; x += 8*FRACUNIT)
+	for (x = self->X() - 196*FRACUNIT; x < self->X() + 320*FRACUNIT; x += 8*FRACUNIT)
 	{
-		BrainishExplosion (x, self->y - 320*FRACUNIT,
+		BrainishExplosion (x, self->Y() - 320*FRACUNIT,
 			128 + (pr_brainscream() << (FRACBITS + 1)));
 	}
 	S_Sound (self, CHAN_VOICE, "brain/death", 1, ATTN_NONE);
@@ -71,9 +71,9 @@ DEFINE_ACTION_FUNCTION(AActor, A_BrainScream)
 DEFINE_ACTION_FUNCTION(AActor, A_BrainExplode)
 {
 	PARAM_ACTION_PROLOGUE;
-	fixed_t x = self->x + pr_brainexplode.Random2()*2048;
+	fixed_t x = self->X() + pr_brainexplode.Random2()*2048;
 	fixed_t z = 128 + pr_brainexplode()*2*FRACUNIT;
-	BrainishExplosion (x, self->y, z);
+	BrainishExplosion (x, self->Y(), z);
 	return 0;
 }
 
@@ -150,11 +150,11 @@ DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_BrainSpit)
 			}
 			else if (abs(spit->vely) > abs(spit->velx))
 			{
-				spit->special2 = (targ->y - self->y) / spit->vely;
+				spit->special2 = (targ->Y() - self->Y()) / spit->vely;
 			}
 			else
 			{
-				spit->special2 = (targ->x - self->x) / spit->velx;
+				spit->special2 = (targ->X() - self->X()) / spit->velx;
 			}
 			// [GZ] Calculates when the projectile will have reached destination
 			spit->special2 += level.maptime;
@@ -196,7 +196,7 @@ static void SpawnFly(AActor *self, PClassActor *spawntype, FSoundID sound)
 	
 	if (spawntype != NULL)
 	{
-		fog = Spawn (spawntype, targ->x, targ->y, targ->z, ALLOW_REPLACE);
+		fog = Spawn (spawntype, targ->Pos(), ALLOW_REPLACE);
 		if (fog != NULL) S_Sound (fog, CHAN_BODY, sound, 1, ATTN_NORM);
 	}
 
@@ -267,7 +267,7 @@ static void SpawnFly(AActor *self, PClassActor *spawntype, FSoundID sound)
 	spawntype = PClass::FindActor(SpawnName);
 	if (spawntype != NULL)
 	{
-		newmobj = Spawn (spawntype, targ->x, targ->y, targ->z, ALLOW_REPLACE);
+		newmobj = Spawn (spawntype, targ->Pos(), ALLOW_REPLACE);
 		if (newmobj != NULL)
 		{
 			// Make the new monster hate what the boss eye hates
@@ -286,7 +286,7 @@ static void SpawnFly(AActor *self, PClassActor *spawntype, FSoundID sound)
 			if (!(newmobj->ObjectFlags & OF_EuthanizeMe))
 			{
 				// telefrag anything in this spot
-				P_TeleportMove (newmobj, newmobj->x, newmobj->y, newmobj->z, true);
+				P_TeleportMove (newmobj, newmobj->Pos(), true);
 			}
 			newmobj->flags4 |= MF4_BOSSSPAWNED;
 		}

src/g_doom/a_doomweaps.cpp

@@ -666,8 +666,7 @@ DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_BFGSpray)
 
 		if (linetarget != NULL)
 		{
-			AActor *spray = Spawn(spraytype, linetarget->x, linetarget->y,
-				linetarget->z + (linetarget->height >> 2), ALLOW_REPLACE);
+			AActor *spray = Spawn(spraytype, linetarget->PosPlusZ(linetarget->height >> 2), ALLOW_REPLACE);
 
 			int dmgFlags = 0;
 			FName dmgType = NAME_BFGSplash;

src/g_doom/a_fatso.cpp

@@ -155,7 +155,7 @@ DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_Mushroom)
 	P_CheckSplash(self, 128<<FRACBITS);
 
 	// Now launch mushroom cloud
-	AActor *target = Spawn("Mapspot", 0, 0, 0, NO_REPLACE);	// We need something to aim at.
+	AActor *target = Spawn("Mapspot", self->Pos(), NO_REPLACE);	// We need something to aim at.
 	AActor *master = (flags & MSF_DontHurt) ? (AActor*)(self->target) : self;
 	target->height = self->height;
  	for (i = -n; i <= n; i += 8)
@@ -163,9 +163,10 @@ DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_Mushroom)
  		for (j = -n; j <= n; j += 8)
 		{
 			AActor *mo;
-			target->x = self->x + (i << FRACBITS);    // Aim in many directions from source
-			target->y = self->y + (j << FRACBITS);
-			target->z = self->z + (P_AproxDistance(i,j) * vrange); // Aim up fairly high
+			target->SetXYZ(
+				self->X() + (i << FRACBITS),    // Aim in many directions from source
+				self->Y() + (j << FRACBITS),
+				self->Z() + (P_AproxDistance(i,j) * vrange)); // Aim up fairly high
 			if ((flags & MSF_Classic) || // Flag explicitely set, or no flags and compat options
 				(flags == 0 && (self->state->DefineFlags & SDF_DEHACKED) && (i_compatflags & COMPATF_MUSHROOM)))
 			{	// Use old function for MBF compatibility

src/g_doom/a_lostsoul.cpp

@@ -41,7 +41,7 @@ void A_SkullAttack(AActor *self, fixed_t speed)
 	
 	if (dist < 1)
 		dist = 1;
-	self->velz = (dest->z + (dest->height>>1) - self->z) / dist;
+	self->velz = (dest->Z() + (dest->height>>1) - self->Z()) / dist;
 }
 
 DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_SkullAttack)

src/g_doom/a_painelemental.cpp

@@ -44,17 +44,14 @@ enum PA_Flags
 //
 void A_PainShootSkull (AActor *self, angle_t angle, PClassActor *spawntype, int flags = 0, int limit = -1)
 {
-	fixed_t x, y, z;
-	
 	AActor *other;
-	angle_t an;
 	int prestep;
 
 	if (spawntype == NULL) return;
 	if (self->DamageType == NAME_Massacre) return;
 
 	// [RH] check to make sure it's not too close to the ceiling
-	if (self->z + self->height + 8*FRACUNIT > self->ceilingz)
+	if (self->Top() + 8*FRACUNIT > self->ceilingz)
 	{
 		if (self->flags & MF_FLOAT)
 		{
@@ -85,26 +82,38 @@ void A_PainShootSkull (AActor *self, angle_t angle, PClassActor *spawntype, int
 	}
 
 	// okay, there's room for another one
-	an = angle >> ANGLETOFINESHIFT;
-	
 	prestep = 4*FRACUNIT +
 		3*(self->radius + GetDefaultByType(spawntype)->radius)/2;
 
-	x = self->x + FixedMul (prestep, finecosine[an]);
-	y = self->y + FixedMul (prestep, finesine[an]);
-	z = self->z + 8*FRACUNIT;
+	// NOTE: The following code contains some advance work for line-to-line portals which is currenty inactive.
 
+	fixedvec2 dist = Vec2Angle(prestep, angle);
+	fixedvec3 pos = self->Vec3Offset(dist.x, dist.y, 8 * FRACUNIT, true);
+	fixedvec3 src = self->Pos();
+
+	for (int i = 0; i < 2; i++)
+	{
 		// Check whether the Lost Soul is being fired through a 1-sided	// phares
 		// wall or an impassible line, or a "monsters can't cross" line.//   |
 		// If it is, then we don't allow the spawn.						//   V
 
-	FBoundingBox box(MIN(self->x, x), MIN(self->y, y), MAX(self->x, x), MAX(self->y, y));
+		FBoundingBox box(MIN(src.x, pos.x), MIN(src.y, pos.y), MAX(src.x, pos.x), MAX(src.y, pos.y));
 		FBlockLinesIterator it(box);
 		line_t *ld;
+		bool inportal = false;
 
 		while ((ld = it.Next()))
 		{
-		if (!(ld->flags & ML_TWOSIDED) ||
+			if (ld->isLinePortal() && i == 0)
+			{
+				if (P_PointOnLineSidePrecise(src.x, src.y, ld) == 0 &&
+					P_PointOnLineSidePrecise(pos.x, pos.y, ld) == 1)
+				{
+					// crossed a portal line from front to back, we need to repeat the check on the other side as well.
+					inportal = true;
+				}
+			}
+			else if (!(ld->flags & ML_TWOSIDED) ||
 				(ld->flags & (ML_BLOCKING | ML_BLOCKMONSTERS | ML_BLOCKEVERYTHING)))
 			{
 				if (!(box.Left() > ld->bbox[BOXRIGHT] ||
@@ -112,20 +121,28 @@ void A_PainShootSkull (AActor *self, angle_t angle, PClassActor *spawntype, int
 					box.Top() < ld->bbox[BOXBOTTOM] ||
 					box.Bottom() > ld->bbox[BOXTOP]))
 				{
-				if (P_PointOnLineSidePrecise(self->x,self->y,ld) != P_PointOnLineSidePrecise(x,y,ld))
+					if (P_PointOnLineSidePrecise(src.x, src.y, ld) != P_PointOnLineSidePrecise(pos.x, pos.y, ld))
 						return;  // line blocks trajectory				//   ^
 				}
 			}
 		}
+		if (!inportal) break;
 
-	other = Spawn (spawntype, x, y, z, ALLOW_REPLACE);
+		// recalculate position and redo the check on the other side of the portal
+		pos = self->Vec3Offset(dist.x, dist.y, 8 * FRACUNIT, false);
+		src.x = pos.x - dist.x;
+		src.y = pos.y - dist.y;
+
+	}
+
+	other = Spawn (spawntype, pos.x, pos.y, pos.z, ALLOW_REPLACE);
 
 	// Check to see if the new Lost Soul's z value is above the
 	// ceiling of its new sector, or below the floor. If so, kill it.
 
-	if ((other->z >
-         (other->Sector->ceilingplane.ZatPoint (other->x, other->y) - other->height)) ||
-        (other->z < other->Sector->floorplane.ZatPoint (other->x, other->y)))
+	if ((other->Z() >
+         (other->Sector->HighestCeiling(other) - other->height)) ||
+        (other->Z() < other->Sector->LowestFloor(other)))
 	{
 		// kill it immediately
 		P_DamageMobj (other, self, self, TELEFRAG_DAMAGE, NAME_None);//  ^
@@ -134,7 +151,7 @@ void A_PainShootSkull (AActor *self, angle_t angle, PClassActor *spawntype, int
 
 	// Check for movements.
 
-	if (!P_CheckPosition (other, other->x, other->y))
+	if (!P_CheckPosition (other, other->Pos()))
 	{
 		// kill it immediately
 		P_DamageMobj (other, self, self, TELEFRAG_DAMAGE, NAME_None);		

src/g_doom/a_revenant.cpp

@@ -28,13 +28,12 @@ DEFINE_ACTION_FUNCTION(AActor, A_SkelMissile)
 		return 0;
 				
 	A_FaceTarget (self);
-	missile = P_SpawnMissileZ (self, self->z + 48*FRACUNIT,
+	missile = P_SpawnMissileZ (self, self->Z() + 48*FRACUNIT,
 		self->target, PClass::FindActor("RevenantTracer"));
 
 	if (missile != NULL)
 	{
-		missile->x += missile->velx;
-		missile->y += missile->vely;
+		missile->SetOrigin(missile->Vec3Offset(missile->velx, missile->vely, 0), false);
 		missile->tracer = self->target;
 	}
 	return 0;
@@ -65,10 +64,9 @@ DEFINE_ACTION_FUNCTION(AActor, A_Tracer)
 		return 0;
 	
 	// spawn a puff of smoke behind the rocket
-	P_SpawnPuff (self, PClass::FindActor(NAME_BulletPuff), self->x, self->y, self->z, 0, 3);
+	P_SpawnPuff (self, PClass::FindActor(NAME_BulletPuff), self->X(), self->Y(), self->Z(), 0, 3);
 		
-	smoke = Spawn ("RevenantTracerSmoke", self->x - self->velx,
-		self->y - self->vely, self->z, ALLOW_REPLACE);
+	smoke = Spawn ("RevenantTracerSmoke", self->Vec3Offset(-self->velx, -self->vely, 0), ALLOW_REPLACE);
 	
 	smoke->velz = FRACUNIT;
 	smoke->tics -= pr_tracer()&3;
@@ -114,11 +112,11 @@ DEFINE_ACTION_FUNCTION(AActor, A_Tracer)
 
 		if (dest->height >= 56*FRACUNIT)
 		{
-			slope = (dest->z+40*FRACUNIT - self->z) / dist;
+			slope = (dest->Z()+40*FRACUNIT - self->Z()) / dist;
 		}
 		else
 		{
-			slope = (dest->z + self->height*2/3 - self->z) / dist;
+			slope = (dest->Z() + self->height*2/3 - self->Z()) / dist;
 		}
 
 		if (slope < self->velz)

src/g_heretic/a_chicken.cpp

@@ -45,7 +45,7 @@ void AChickenPlayer::MorphPlayerThink ()
 	{ // Twitch view angle
 		angle += pr_chickenplayerthink.Random2 () << 19;
 	}
-	if ((z <= floorz) && (pr_chickenplayerthink() < 32))
+	if ((Z() <= floorz) && (pr_chickenplayerthink() < 32))
 	{ // Jump and noise
 		velz += JumpZ;
 
@@ -105,7 +105,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_Feathers)
 	}
 	for (i = 0; i < count; i++)
 	{
-		mo = Spawn("Feather", self->x, self->y, self->z+20*FRACUNIT, NO_REPLACE);
+		mo = Spawn("Feather", self->PosPlusZ(20*FRACUNIT), NO_REPLACE);
 		mo->target = self;
 		mo->velx = pr_feathers.Random2() << 8;
 		mo->vely = pr_feathers.Random2() << 8;

src/g_heretic/a_dsparil.cpp

@@ -86,17 +86,17 @@ DEFINE_ACTION_FUNCTION(AActor, A_Srcr1Attack)
 	PClassActor *fx = PClass::FindActor("SorcererFX1");
 	if (self->health > (self->SpawnHealth()/3)*2)
 	{ // Spit one fireball
-		P_SpawnMissileZ (self, self->z + 48*FRACUNIT, self->target, fx );
+		P_SpawnMissileZ (self, self->Z() + 48*FRACUNIT, self->target, fx );
 	}
 	else
 	{ // Spit three fireballs
-		mo = P_SpawnMissileZ (self, self->z + 48*FRACUNIT, self->target, fx);
+		mo = P_SpawnMissileZ (self, self->Z() + 48*FRACUNIT, self->target, fx);
 		if (mo != NULL)
 		{
 			velz = mo->velz;
 			angle = mo->angle;
-			P_SpawnMissileAngleZ (self, self->z + 48*FRACUNIT, fx, angle-ANGLE_1*3, velz);
-			P_SpawnMissileAngleZ (self, self->z + 48*FRACUNIT, fx, angle+ANGLE_1*3, velz);
+			P_SpawnMissileAngleZ (self, self->Z() + 48*FRACUNIT, fx, angle-ANGLE_1*3, velz);
+			P_SpawnMissileAngleZ (self, self->Z() + 48*FRACUNIT, fx, angle+ANGLE_1*3, velz);
 		}
 		if (self->health < self->SpawnHealth()/3)
 		{ // Maybe attack again
@@ -127,7 +127,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_SorcererRise)
 	AActor *mo;
 
 	self->flags &= ~MF_SOLID;
-	mo = Spawn("Sorcerer2", self->x, self->y, self->z, ALLOW_REPLACE);
+	mo = Spawn("Sorcerer2", self->Pos(), ALLOW_REPLACE);
 	mo->Translation = self->Translation;
 	mo->SetState (mo->FindState("Rise"));
 	mo->angle = self->angle;
@@ -152,20 +152,20 @@ void P_DSparilTeleport (AActor *actor)
 	DSpotState *state = DSpotState::GetSpotState();
 	if (state == NULL) return;
 
-	spot = state->GetSpotWithMinMaxDistance(PClass::FindClass("BossSpot"), actor->x, actor->y, 128*FRACUNIT, 0);
+	spot = state->GetSpotWithMinMaxDistance(PClass::FindClass("BossSpot"), actor->X(), actor->Y(), 128*FRACUNIT, 0);
 	if (spot == NULL) return;
 
-	prevX = actor->x;
-	prevY = actor->y;
-	prevZ = actor->z;
-	if (P_TeleportMove (actor, spot->x, spot->y, spot->z, false))
+	prevX = actor->X();
+	prevY = actor->Y();
+	prevZ = actor->Z();
+	if (P_TeleportMove (actor, spot->Pos(), false))
 	{
 		mo = Spawn("Sorcerer2Telefade", prevX, prevY, prevZ, ALLOW_REPLACE);
 		if (mo) mo->Translation = actor->Translation;
 		S_Sound (mo, CHAN_BODY, "misc/teleport", 1, ATTN_NORM);
 		actor->SetState (actor->FindState("Teleport"));
 		S_Sound (actor, CHAN_BODY, "misc/teleport", 1, ATTN_NORM);
-		actor->z = actor->floorz;
+		actor->SetZ(actor->floorz, false);
 		actor->angle = spot->angle;
 		actor->velx = actor->vely = actor->velz = 0;
 	}
@@ -256,7 +256,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_BlueSpark)
 
 	for (i = 0; i < 2; i++)
 	{
-		mo = Spawn("Sorcerer2FXSpark", self->x, self->y, self->z, ALLOW_REPLACE);
+		mo = Spawn("Sorcerer2FXSpark", self->Pos(), ALLOW_REPLACE);
 		mo->velx = pr_bluespark.Random2() << 9;
 		mo->vely = pr_bluespark.Random2() << 9;
 		mo->velz = FRACUNIT + (pr_bluespark()<<8);
@@ -276,10 +276,10 @@ DEFINE_ACTION_FUNCTION(AActor, A_GenWizard)
 
 	AActor *mo;
 
-	mo = Spawn("Wizard", self->x, self->y, self->z, ALLOW_REPLACE);
+	mo = Spawn("Wizard", self->Pos(), ALLOW_REPLACE);
 	if (mo != NULL)
 	{
-		mo->z -= mo->GetDefault()->height/2;
+		mo->AddZ(-mo->GetDefault()->height / 2, false);
 		if (!P_TestMobjLocation (mo))
 		{ // Didn't fit
 			mo->ClearCounters();
@@ -294,7 +294,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_GenWizard)
 			self->flags &= ~MF_MISSILE;
 			mo->master = self->target;
 			// Heretic did not offset it by TELEFOGHEIGHT, so I won't either.
-			Spawn<ATeleportFog> (self->x, self->y, self->z, ALLOW_REPLACE);
+			Spawn<ATeleportFog> (self->Pos(), ALLOW_REPLACE);
 		}
 	}
 	return 0;

src/g_heretic/a_hereticartifacts.cpp

@@ -49,8 +49,8 @@ DEFINE_ACTION_FUNCTION(AActor, A_TimeBomb)
 {
 	PARAM_ACTION_PROLOGUE;
 
-	self->z += 32*FRACUNIT;
-	self->PrevZ = self->z;	// no interpolation!
+	self->AddZ(32*FRACUNIT, false);
+	self->PrevZ = self->Z();	// no interpolation!
 	self->RenderStyle = STYLE_Add;
 	self->alpha = FRACUNIT;
 	P_RadiusAttack (self, self->target, 128, 128, self->DamageType, RADF_HURTSOURCE);
@@ -72,9 +72,7 @@ bool AArtiTimeBomb::Use (bool pickup)
 {
 	angle_t angle = Owner->angle >> ANGLETOFINESHIFT;
 	AActor *mo = Spawn("ActivatedTimeBomb",
-		Owner->x + 24*finecosine[angle],
-		Owner->y + 24*finesine[angle],
-		Owner->z - Owner->floorclip, ALLOW_REPLACE);
+		Vec3Angle(24*FRACUNIT, Owner->angle, - Owner->floorclip), ALLOW_REPLACE);
 	mo->target = Owner;
 	return true;
 }

src/g_heretic/a_hereticimp.cpp

@@ -46,12 +46,12 @@ DEFINE_ACTION_FUNCTION(AActor, A_ImpExplode)
 
 	self->flags &= ~MF_NOGRAVITY;
 
-	chunk = Spawn("HereticImpChunk1", self->x, self->y, self->z, ALLOW_REPLACE);
+	chunk = Spawn("HereticImpChunk1", self->Pos(), ALLOW_REPLACE);
 	chunk->velx = pr_imp.Random2 () << 10;
 	chunk->vely = pr_imp.Random2 () << 10;
 	chunk->velz = 9*FRACUNIT;
 
-	chunk = Spawn("HereticImpChunk2", self->x, self->y, self->z, ALLOW_REPLACE);
+	chunk = Spawn("HereticImpChunk2", self->Pos(), ALLOW_REPLACE);
 	chunk->velx = pr_imp.Random2 () << 10;
 	chunk->vely = pr_imp.Random2 () << 10;
 	chunk->velz = 9*FRACUNIT;

src/g_heretic/a_hereticmisc.cpp

@@ -57,7 +57,7 @@ DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_PodPain)
 	}
 	for (count = chance > 240 ? 2 : 1; count; count--)
 	{
-		goo = Spawn(gootype, self->x, self->y, self->z + 48*FRACUNIT, ALLOW_REPLACE);
+		goo = Spawn(gootype, self->PosPlusZ(48*FRACUNIT), ALLOW_REPLACE);
 		goo->target = self;
 		goo->velx = pr_podpain.Random2() << 9;
 		goo->vely = pr_podpain.Random2() << 9;
@@ -104,15 +104,13 @@ DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_MakePod)
 	AActor *mo;
 	fixed_t x;
 	fixed_t y;
-	fixed_t z;
 
 	if (self->special1 == MAX_GEN_PODS)
 	{ // Too many generated pods
 		return 0;
 	}
-	x = self->x;
-	y = self->y;
-	z = self->z;
+	x = self->X();
+	y = self->Y();
 	mo = Spawn(podtype, x, y, ONFLOORZ, ALLOW_REPLACE);
 	if (!P_CheckPosition (mo, x, y))
 	{ // Didn't fit
@@ -177,8 +175,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_VolcanoBlast)
 	count = 1 + (pr_blast() % 3);
 	for (i = 0; i < count; i++)
 	{
-		blast = Spawn("VolcanoBlast", self->x, self->y,
-			self->z + 44*FRACUNIT, ALLOW_REPLACE);
+		blast = Spawn("VolcanoBlast", self->PosPlusZ(44*FRACUNIT), ALLOW_REPLACE);
 		blast->target = self;
 		angle = pr_blast () << 24;
 		blast->angle = angle;
@@ -206,17 +203,17 @@ DEFINE_ACTION_FUNCTION(AActor, A_VolcBallImpact)
 	AActor *tiny;
 	angle_t angle;
 
-	if (self->z <= self->floorz)
+	if (self->Z() <= self->floorz)
 	{
 		self->flags |= MF_NOGRAVITY;
 		self->gravity = FRACUNIT;
-		self->z += 28*FRACUNIT;
+		self->AddZ(28*FRACUNIT);
 		//self->velz = 3*FRACUNIT;
 	}
 	P_RadiusAttack (self, self->target, 25, 25, NAME_Fire, RADF_HURTSOURCE);
 	for (i = 0; i < 4; i++)
 	{
-		tiny = Spawn("VolcanoTBlast", self->x, self->y, self->z, ALLOW_REPLACE);
+		tiny = Spawn("VolcanoTBlast", self->Pos(), ALLOW_REPLACE);
 		tiny->target = self;
 		angle = i*ANG90;
 		tiny->angle = angle;

src/g_heretic/a_hereticweaps.cpp

@@ -401,14 +401,13 @@ void FireMacePL1B (AActor *actor)
 		if (!weapon->DepleteAmmo (weapon->bAltFire))
 			return;
 	}
-	ball = Spawn("MaceFX2", actor->x, actor->y, actor->z + 28*FRACUNIT 
-		- actor->floorclip, ALLOW_REPLACE);
+	ball = Spawn("MaceFX2", actor->PosPlusZ(28*FRACUNIT - actor->floorclip), ALLOW_REPLACE);
 	ball->velz = 2*FRACUNIT+/*((player->lookdir)<<(FRACBITS-5))*/
 		finetangent[FINEANGLES/4-(actor->pitch>>ANGLETOFINESHIFT)];
 	angle = actor->angle;
 	ball->target = actor;
 	ball->angle = angle;
-	ball->z += 2*finetangent[FINEANGLES/4-(actor->pitch>>ANGLETOFINESHIFT)];
+	ball->AddZ(2*finetangent[FINEANGLES/4-(actor->pitch>>ANGLETOFINESHIFT)]);
 	angle >>= ANGLETOFINESHIFT;
 	ball->velx = (actor->velx>>1) + FixedMul(ball->Speed, finecosine[angle]);
 	ball->vely = (actor->vely>>1) + FixedMul(ball->Speed, finesine[angle]);
@@ -538,10 +537,12 @@ DEFINE_ACTION_FUNCTION(AActor, A_MaceBallImpact2)
 
 	if (self->flags & MF_INBOUNCE)
 	{
-		fixed_t floordist = self->z - self->floorz;
-		fixed_t ceildist = self->ceilingz - self->z;
+		fixed_t floordist = self->Z() - self->floorz;
+		fixed_t ceildist = self->ceilingz - self->Z();
 		fixed_t vel;
 
+		// NOTE: The assumptions being made here about the plane to use for bouncing off are dead wrong.
+		// http://forum.zdoom.org/viewtopic.php?f=2&t=50449
 		if (floordist <= ceildist)
 		{
 			vel = MulScale32 (self->velz, self->Sector->floorplane.c);
@@ -559,7 +560,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_MaceBallImpact2)
 		self->velz = (self->velz * 192) >> 8;
 		self->SetState (self->SpawnState);
 
-		tiny = Spawn("MaceFX3", self->x, self->y, self->z, ALLOW_REPLACE);
+		tiny = Spawn("MaceFX3", self->Pos(), ALLOW_REPLACE);
 		angle = self->angle+ANG90;
 		tiny->target = self->target;
 		tiny->angle = angle;
@@ -569,7 +570,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_MaceBallImpact2)
 		tiny->velz = self->velz;
 		P_CheckMissileSpawn (tiny, self->radius);
 
-		tiny = Spawn("MaceFX3", self->x, self->y, self->z, ALLOW_REPLACE);
+		tiny = Spawn("MaceFX3", self->Pos(), ALLOW_REPLACE);
 		angle = self->angle-ANG90;
 		tiny->target = self->target;
 		tiny->angle = angle;
@@ -647,17 +648,19 @@ DEFINE_ACTION_FUNCTION(AActor, A_DeathBallImpact)
 	bool newAngle;
 	AActor *linetarget;
 
-	if ((self->z <= self->floorz) && P_HitFloor (self))
+	if ((self->Z() <= self->floorz) && P_HitFloor (self))
 	{ // Landed in some sort of liquid
 		self->Destroy ();
 		return 0;
 	}
 	if (self->flags & MF_INBOUNCE)
 	{
-		fixed_t floordist = self->z - self->floorz;
-		fixed_t ceildist = self->ceilingz - self->z;
+		fixed_t floordist = self->Z() - self->floorz;
+		fixed_t ceildist = self->ceilingz - self->Z();
 		fixed_t vel;
 
+		// NOTE: The assumptions being made here about the plane to use for bouncing off are dead wrong.
+		// http://forum.zdoom.org/viewtopic.php?f=2&t=50449
 		if (floordist <= ceildist)
 		{
 			vel = MulScale32 (self->velz, self->Sector->floorplane.c);
@@ -757,7 +760,7 @@ void ABlasterFX1::Effect ()
 {
 	if (pr_bfx1t() < 64)
 	{
-		Spawn("BlasterSmoke", x, y, MAX<fixed_t> (z - 8 * FRACUNIT, floorz), ALLOW_REPLACE);
+		Spawn("BlasterSmoke", X(), Y(), MAX<fixed_t> (Z() - 8 * FRACUNIT, floorz), ALLOW_REPLACE);
 	}
 }
 
@@ -841,7 +844,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_SpawnRippers)
 
 	for(i = 0; i < 8; i++)
 	{
-		ripper = Spawn<ARipper> (self->x, self->y, self->z, ALLOW_REPLACE);
+		ripper = Spawn<ARipper> (self->Pos(), ALLOW_REPLACE);
 		angle = i*ANG45;
 		ripper->target = self->target;
 		ripper->angle = angle;
@@ -1061,8 +1064,6 @@ DEFINE_ACTION_FUNCTION(AActor, A_SkullRodStorm)
 {
 	PARAM_ACTION_PROLOGUE;
 
-	fixed_t x;
-	fixed_t y;
 	AActor *mo;
 	ARainTracker *tracker;
 
@@ -1093,20 +1094,21 @@ DEFINE_ACTION_FUNCTION(AActor, A_SkullRodStorm)
 	{ // Fudge rain frequency
 		return 0;
 	}
-	x = self->x + ((pr_storm()&127) - 64) * FRACUNIT;
-	y = self->y + ((pr_storm()&127) - 64) * FRACUNIT;
-	mo = Spawn<ARainPillar> (x, y, ONCEILINGZ, ALLOW_REPLACE);
+	fixedvec2 pos = self->Vec2Offset(
+		((pr_storm()&127) - 64) * FRACUNIT,
+		((pr_storm()&127) - 64) * FRACUNIT);
+	mo = Spawn<ARainPillar> (pos.x, pos.y, ONCEILINGZ, ALLOW_REPLACE);
 	// We used bouncecount to store the 3D floor index in A_HideInCeiling
 	if (!mo) return 0;
 	fixed_t newz;
 	if (self->bouncecount >= 0 
 		&& (unsigned)self->bouncecount < self->Sector->e->XFloor.ffloors.Size())
-		newz = self->Sector->e->XFloor.ffloors[self->bouncecount]->bottom.plane->ZatPoint(x, y);// - 40 * FRACUNIT;
+		newz = self->Sector->e->XFloor.ffloors[self->bouncecount]->bottom.plane->ZatPoint(pos.x, pos.y);// - 40 * FRACUNIT;
 	else
-		newz = self->Sector->ceilingplane.ZatPoint(x, y);
-	int moceiling = P_Find3DFloor(NULL, x, y, newz, false, false, newz);
+		newz = self->Sector->ceilingplane.ZatPoint(pos.x, pos.y);
+	int moceiling = P_Find3DFloor(NULL, pos.x, pos.y, newz, false, false, newz);
 	if (moceiling >= 0)
-		mo->z = newz - mo->height;
+		mo->SetZ(newz - mo->height, false);
 	mo->Translation = multiplayer ?
 		TRANSLATION(TRANSLATION_PlayersExtra,self->special2) : 0;
 	mo->target = self->target;
@@ -1130,8 +1132,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_SkullRodStorm)
 DEFINE_ACTION_FUNCTION(AActor, A_RainImpact)
 {
 	PARAM_ACTION_PROLOGUE;
-
-	if (self->z > self->floorz)
+	if (self->Z() > self->floorz)
 	{
 		self->SetState (self->FindState("NotFloor"));
 	}
@@ -1159,15 +1160,15 @@ DEFINE_ACTION_FUNCTION(AActor, A_HideInCeiling)
 		F3DFloor * rover = self->Sector->e->XFloor.ffloors[i];
 		if(!(rover->flags & FF_SOLID) || !(rover->flags & FF_EXISTS)) continue;
 		 
-		if ((foo = rover->bottom.plane->ZatPoint(self)) >= (self->z + self->height))
+		if ((foo = rover->bottom.plane->ZatPoint(self)) >= (self->Top()))
 		{
-			self->z = foo + 4*FRACUNIT;
+			self->SetZ(foo + 4*FRACUNIT, false);
 			self->bouncecount = i;
 			return 0;
 		}
 	}
 	self->bouncecount = -1;
-	self->z = self->ceilingz + 4*FRACUNIT;
+	self->SetZ(self->ceilingz + 4*FRACUNIT, false);
 	return 0;
 }
 
@@ -1291,13 +1292,13 @@ DEFINE_ACTION_FUNCTION(AActor, A_PhoenixPuff)
 
 	//[RH] Heretic never sets the target for seeking
 	//P_SeekerMissile (self, ANGLE_1*5, ANGLE_1*10);
-	puff = Spawn("PhoenixPuff", self->x, self->y, self->z, ALLOW_REPLACE);
+	puff = Spawn("PhoenixPuff", self->Pos(), ALLOW_REPLACE);
 	angle = self->angle + ANG90;
 	angle >>= ANGLETOFINESHIFT;
 	puff->velx = FixedMul (FRACUNIT*13/10, finecosine[angle]);
 	puff->vely = FixedMul (FRACUNIT*13/10, finesine[angle]);
 	puff->velz = 0;
-	puff = Spawn("PhoenixPuff", self->x, self->y, self->z, ALLOW_REPLACE);
+	puff = Spawn("PhoenixPuff", self->Pos(), ALLOW_REPLACE);
 	angle = self->angle - ANG90;
 	angle >>= ANGLETOFINESHIFT;
 	puff->velx = FixedMul (FRACUNIT*13/10, finecosine[angle]);
@@ -1341,7 +1342,6 @@ DEFINE_ACTION_FUNCTION(AActor, A_FirePhoenixPL2)
 
 	AActor *mo;
 	angle_t angle;
-	fixed_t x, y, z;
 
 	fixed_t slope;
 	FSoundID soundid;
@@ -1364,12 +1364,14 @@ DEFINE_ACTION_FUNCTION(AActor, A_FirePhoenixPL2)
 		return 0;
 	}
 	angle = self->angle;
-	x = self->x + (pr_fp2.Random2() << 9);
-	y = self->y + (pr_fp2.Random2() << 9);
-	z = self->z + 26*FRACUNIT + finetangent[FINEANGLES/4-(self->pitch>>ANGLETOFINESHIFT)];
-	z -= self->floorclip;
+
+	fixedvec3 pos = self->Vec3Offset(
+		(pr_fp2.Random2() << 9),
+		(pr_fp2.Random2() << 9),
+		26*FRACUNIT + finetangent[FINEANGLES/4-(self->pitch>>ANGLETOFINESHIFT)] - self->floorclip);
+
 	slope = finetangent[FINEANGLES/4-(self->pitch>>ANGLETOFINESHIFT)] + (FRACUNIT/10);
-	mo = Spawn("PhoenixFX2", x, y, z, ALLOW_REPLACE);
+	mo = Spawn("PhoenixFX2", pos, ALLOW_REPLACE);
 	mo->target = self;
 	mo->angle = angle;
 	mo->velx = self->velx + FixedMul (mo->Speed, finecosine[angle>>ANGLETOFINESHIFT]);

src/g_heretic/a_ironlich.cpp

@@ -108,8 +108,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_LichAttack)
 			baseFire->SetState (baseFire->FindState("NoGrow"));
 			for (i = 0; i < 5; i++)
 			{
-				fire = Spawn("HeadFX3", baseFire->x, baseFire->y,
-					baseFire->z, ALLOW_REPLACE);
+				fire = Spawn("HeadFX3", baseFire->Pos(), ALLOW_REPLACE);
 				if (i == 0)
 				{
 					S_Sound (self, CHAN_BODY, "ironlich/attack1", 1, ATTN_NORM);
@@ -130,7 +129,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_LichAttack)
 		mo = P_SpawnMissile (self, target, RUNTIME_CLASS(AWhirlwind));
 		if (mo != NULL)
 		{
-			mo->z -= 32*FRACUNIT;
+			mo->AddZ(-32*FRACUNIT, false);
 			mo->tracer = target;
 			mo->special1 = 60;
 			mo->special2 = 50; // Timer for active sound
@@ -188,7 +187,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_LichIceImpact)
 
 	for (i = 0; i < 8; i++)
 	{
-		shard = Spawn("HeadFX2", self->x, self->y, self->z, ALLOW_REPLACE);
+		shard = Spawn("HeadFX2", self->Pos(), ALLOW_REPLACE);
 		angle = i*ANG45;
 		shard->target = self->target;
 		shard->angle = angle;
@@ -212,7 +211,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_LichFireGrow)
 	PARAM_ACTION_PROLOGUE;
 
 	self->health--;
-	self->z += 9*FRACUNIT;
+	self->AddZ(9*FRACUNIT);
 	if (self->health == 0)
 	{
 		self->Damage = self->GetDefault()->Damage;

src/g_heretic/a_knight.cpp

@@ -24,11 +24,11 @@ DEFINE_ACTION_FUNCTION(AActor, A_DripBlood)
 	PARAM_ACTION_PROLOGUE;
 
 	AActor *mo;
-	fixed_t x, y;
 
-	x = self->x + (pr_dripblood.Random2 () << 11);
-	y = self->y + (pr_dripblood.Random2 () << 11);
-	mo = Spawn ("Blood", x, y, self->z, ALLOW_REPLACE);
+	fixedvec3 pos = self->Vec3Offset(
+	 (pr_dripblood.Random2 () << 11),
+	 (pr_dripblood.Random2 () << 11), 0);
+	mo = Spawn ("Blood", pos, ALLOW_REPLACE);
 	mo->velx = pr_dripblood.Random2 () << 10;
 	mo->vely = pr_dripblood.Random2 () << 10;
 	mo->gravity = FRACUNIT/8;
@@ -61,11 +61,10 @@ DEFINE_ACTION_FUNCTION(AActor, A_KnightAttack)
 	S_Sound (self, CHAN_BODY, self->AttackSound, 1, ATTN_NORM);
 	if (self->flags & MF_SHADOW || pr_knightatk () < 40)
 	{ // Red axe
-		P_SpawnMissileZ (self, self->z + 36*FRACUNIT, self->target, PClass::FindActor("RedAxe"));
-		return 0;
+		P_SpawnMissileZ (self, self->Z() + 36*FRACUNIT, self->target, PClass::FindActor("RedAxe"));
+		return;
 	}
 	// Green axe
-	P_SpawnMissileZ (self, self->z + 36*FRACUNIT, self->target, PClass::FindActor("KnightAxe"));
-	return 0;
+	P_SpawnMissileZ (self, self->Z() + 36*FRACUNIT, self->target, PClass::FindActor("KnightAxe"));
 }
 

src/g_hexen/a_bats.cpp

@@ -92,7 +92,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_BatMove)
 	}
 
 	// Handle Z movement
-	self->z = self->target->z + 16*finesine[self->args[0] << BOBTOFINESHIFT];
+	self->SetZ(self->target->Z() + 16*finesine[self->args[0] << BOBTOFINESHIFT]);
 	self->args[0] = (self->args[0]+3)&63;	
 	return 0;
 }

src/g_hexen/a_bishop.cpp

@@ -157,7 +157,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_BishopSpawnBlur)
 			self->SetState (self->MissileState);
 		}
 	}
-	mo = Spawn ("BishopBlur", self->x, self->y, self->z, ALLOW_REPLACE);
+	mo = Spawn ("BishopBlur", self->Pos(), ALLOW_REPLACE);
 	if (mo)
 	{
 		mo->angle = self->angle;
@@ -175,9 +175,10 @@ DEFINE_ACTION_FUNCTION(AActor, A_BishopChase)
 {
 	PARAM_ACTION_PROLOGUE;
 
-	self->z -= finesine[self->special2 << BOBTOFINESHIFT] * 4;
+	fixed_t newz = self->Z() - finesine[self->special2 << BOBTOFINESHIFT] * 4;
 	self->special2 = (self->special2 + 4) & 63;
-	self->z += finesine[self->special2 << BOBTOFINESHIFT] * 4;
+	newz += finesine[self->special2 << BOBTOFINESHIFT] * 4;
+	self->SetZ(newz);
 	return 0;
 }
 
@@ -193,7 +194,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_BishopPuff)
 
 	AActor *mo;
 
-	mo = Spawn ("BishopPuff", self->x, self->y, self->z + 40*FRACUNIT, ALLOW_REPLACE);
+	mo = Spawn ("BishopPuff", self->PosPlusZ(40*FRACUNIT), ALLOW_REPLACE);
 	if (mo)
 	{
 		mo->velz = FRACUNIT/2;
@@ -218,10 +219,11 @@ DEFINE_ACTION_FUNCTION(AActor, A_BishopPainBlur)
 		self->SetState (self->FindState ("Blur"));
 		return 0;
 	}
-	fixed_t x = self->x + (pr_pain.Random2()<<12);
-	fixed_t y = self->y + (pr_pain.Random2()<<12);
-	fixed_t z = self->z + (pr_pain.Random2()<<11);
-	mo = Spawn ("BishopPainBlur", x, y, z, ALLOW_REPLACE);
+	fixedvec3 pos = self->Vec3Offset(
+		(pr_pain.Random2()<<12),
+		(pr_pain.Random2()<<12),
+		(pr_pain.Random2()<<11));
+	mo = Spawn ("BishopPainBlur", pos, ALLOW_REPLACE);
 	if (mo)
 	{
 		mo->angle = self->angle;

src/g_hexen/a_blastradius.cpp

@@ -26,7 +26,7 @@ void BlastActor (AActor *victim, fixed_t strength, fixed_t speed, AActor *Owner,
 {
 	angle_t angle,ang;
 	AActor *mo;
-	fixed_t x,y,z;
+	fixedvec3 pos;
 
 	if (!victim->SpecialBlastHandling (Owner, strength))
 	{
@@ -41,10 +41,11 @@ void BlastActor (AActor *victim, fixed_t strength, fixed_t speed, AActor *Owner,
 	// Spawn blast puff
 	ang = victim->AngleTo(Owner);
 	ang >>= ANGLETOFINESHIFT;
-	x = victim->x + FixedMul (victim->radius+FRACUNIT, finecosine[ang]);
-	y = victim->y + FixedMul (victim->radius+FRACUNIT, finesine[ang]);
-	z = victim->z - victim->floorclip + (victim->height>>1);
-	mo = Spawn (blasteffect, x, y, z, ALLOW_REPLACE);
+	pos = victim->Vec3Offset(
+		FixedMul (victim->radius+FRACUNIT, finecosine[ang]),
+		FixedMul (victim->radius+FRACUNIT, finesine[ang]),
+		-victim->floorclip + (victim->height>>1));
+	mo = Spawn (blasteffect, pos, ALLOW_REPLACE);
 	if (mo)
 	{
 		mo->velx = victim->velx;

src/g_hexen/a_clericflame.cpp

@@ -48,12 +48,12 @@ void ACFlameMissile::Effect ()
 	if (!--special1)
 	{
 		special1 = 4;
-		newz = z-12*FRACUNIT;
+		newz = Z()-12*FRACUNIT;
 		if (newz < floorz)
 		{
 			newz = floorz;
 		}
-		AActor *mo = Spawn ("CFlameFloor", x, y, newz, ALLOW_REPLACE);
+		AActor *mo = Spawn ("CFlameFloor", X(), Y(), newz, ALLOW_REPLACE);
 		if (mo)
 		{
 			mo->angle = angle;
@@ -131,9 +131,10 @@ DEFINE_ACTION_FUNCTION(AActor, A_CFlameMissile)
 		{
 			an = (i*ANG45)>>ANGLETOFINESHIFT;
 			an90 = (i*ANG45+ANG90)>>ANGLETOFINESHIFT;
-			mo = Spawn ("CircleFlame", BlockingMobj->x+FixedMul(dist, finecosine[an]),
-				BlockingMobj->y+FixedMul(dist, finesine[an]), 
-				BlockingMobj->z+5*FRACUNIT, ALLOW_REPLACE);
+			mo = Spawn ("CircleFlame", BlockingMobj->Vec3Offset(
+				FixedMul(dist, finecosine[an]),
+				FixedMul(dist, finesine[an]), 
+				5*FRACUNIT), ALLOW_REPLACE);
 			if (mo)
 			{
 				mo->angle = an<<ANGLETOFINESHIFT;
@@ -142,9 +143,10 @@ DEFINE_ACTION_FUNCTION(AActor, A_CFlameMissile)
 				mo->vely = mo->special2 = FixedMul(FLAMESPEED, finesine[an]);
 				mo->tics -= pr_missile()&3;
 			}
-			mo = Spawn ("CircleFlame", BlockingMobj->x-FixedMul(dist, finecosine[an]),
-				BlockingMobj->y-FixedMul(dist, finesine[an]), 
-				BlockingMobj->z+5*FRACUNIT, ALLOW_REPLACE);
+			mo = Spawn ("CircleFlame", BlockingMobj->Vec3Offset(
+				-FixedMul(dist, finecosine[an]),
+				-FixedMul(dist, finesine[an]), 
+				5*FRACUNIT), ALLOW_REPLACE);
 			if(mo)
 			{
 				mo->angle = ANG180+(an<<ANGLETOFINESHIFT);

src/g_hexen/a_clericholy.cpp

@@ -94,7 +94,7 @@ bool AHolySpirit::Slam (AActor *thing)
 			P_DamageMobj (thing, this, target, dam, NAME_Melee);
 			if (pr_spiritslam() < 128)
 			{
-				Spawn ("HolyPuff", x, y, z, ALLOW_REPLACE);
+				Spawn ("HolyPuff", Pos(), ALLOW_REPLACE);
 				S_Sound (this, CHAN_WEAPON, "SpiritAttack", 1, ATTN_NORM);
 				if (thing->flags3&MF3_ISMONSTER && pr_spiritslam() < 128)
 				{
@@ -138,7 +138,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_CHolyAttack2)
 
 	for (j = 0; j < 4; j++)
 	{
-		mo = Spawn<AHolySpirit> (self->x, self->y, self->z, ALLOW_REPLACE);
+		mo = Spawn<AHolySpirit> (self->Pos(), ALLOW_REPLACE);
 		if (!mo)
 		{
 			continue;
@@ -159,7 +159,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_CHolyAttack2)
 				mo->special2 = ((FINEANGLES/2 + i) << 16) + FINEANGLES/2 + pr_holyatk2(8 << BOBTOFINESHIFT);
 				break;
 		}
-		mo->z = self->z;
+		mo->SetZ(self->Z());
 		mo->angle = self->angle+(ANGLE_45+ANGLE_45/2)-ANGLE_45*j;
 		P_ThrustMobj(mo, mo->angle, mo->Speed);
 		mo->target = self->target;
@@ -191,11 +191,11 @@ void SpawnSpiritTail (AActor *spirit)
 	AActor *tail, *next;
 	int i;
 	
-	tail = Spawn ("HolyTail", spirit->x, spirit->y, spirit->z, ALLOW_REPLACE);
+	tail = Spawn ("HolyTail", spirit->Pos(), ALLOW_REPLACE);
 	tail->target = spirit; // parent
 	for (i = 1; i < 3; i++)
 	{
-		next = Spawn ("HolyTailTrail", spirit->x, spirit->y, spirit->z, ALLOW_REPLACE);
+		next = Spawn ("HolyTailTrail", spirit->Pos(), ALLOW_REPLACE);
 		tail->tracer = next;
 		tail = next;
 	}
@@ -276,24 +276,24 @@ static void CHolyTailFollow (AActor *actor, fixed_t dist)
 		{
 			an = actor->AngleTo(child) >> ANGLETOFINESHIFT;
 			oldDistance = child->AproxDistance (actor);
-			if (P_TryMove (child, actor->x+FixedMul(dist, finecosine[an]), 
-				actor->y+FixedMul(dist, finesine[an]), true))
+			if (P_TryMove (child, actor->X()+FixedMul(dist, finecosine[an]), 
+				actor->Y()+FixedMul(dist, finesine[an]), true))
 			{
 				newDistance = child->AproxDistance (actor)-FRACUNIT;
 				if (oldDistance < FRACUNIT)
 				{
-					if (child->z < actor->z)
+					if (child->Z() < actor->Z())
 					{
-						child->z = actor->z-dist;
+						child->SetZ(actor->Z()-dist);
 					}
 					else
 					{
-						child->z = actor->z+dist;
+						child->SetZ(actor->Z()+dist);
 					}
 				}
 				else
 				{
-					child->z = actor->z + Scale (newDistance, child->z-actor->z, oldDistance);
+					child->SetZ(actor->Z() + Scale (newDistance, child->Z()-actor->Z(), oldDistance));
 				}
 			}
 		}
@@ -342,10 +342,10 @@ DEFINE_ACTION_FUNCTION(AActor, A_CHolyTail)
 	else
 	{
 		if (P_TryMove (self,
-			parent->x - 14*finecosine[parent->angle>>ANGLETOFINESHIFT],
-			parent->y - 14*finesine[parent->angle>>ANGLETOFINESHIFT], true))
+			parent->X() - 14*finecosine[parent->angle>>ANGLETOFINESHIFT],
+			parent->Y() - 14*finesine[parent->angle>>ANGLETOFINESHIFT], true))
 		{
-			self->z = parent->z-5*FRACUNIT;
+			self->SetZ(parent->Z()-5*FRACUNIT);
 		}
 		CHolyTailFollow (self, 10*FRACUNIT);
 	}
@@ -422,11 +422,11 @@ static void CHolySeekerMissile (AActor *actor, angle_t thresh, angle_t turnMax)
 	actor->velx = FixedMul (actor->Speed, finecosine[angle]);
 	actor->vely = FixedMul (actor->Speed, finesine[angle]);
 	if (!(level.time&15) 
-		|| actor->z > target->z+(target->height)
-		|| actor->z+actor->height < target->z)
+		|| actor->Z() > target->Top()
+		|| actor->Top() < target->Z())
 	{
-		newZ = target->z+((pr_holyseeker()*target->height)>>8);
-		deltaZ = newZ-actor->z;
+		newZ = target->Z()+((pr_holyseeker()*target->height)>>8);
+		deltaZ = newZ - actor->Z();
 		if (abs(deltaZ) > 15*FRACUNIT)
 		{
 			if (deltaZ > 0)
@@ -457,22 +457,24 @@ static void CHolySeekerMissile (AActor *actor, angle_t thresh, angle_t turnMax)
 
 void CHolyWeave (AActor *actor, FRandom &pr_random)
 {
-	fixed_t newX, newY;
+	fixed_t newX, newY, newZ;
 	int weaveXY, weaveZ;
 	int angle;
 
 	weaveXY = actor->special2 >> 16;
 	weaveZ = actor->special2 & FINEMASK;
 	angle = (actor->angle + ANG90) >> ANGLETOFINESHIFT;
-	newX = actor->x - FixedMul(finecosine[angle], finesine[weaveXY] * 32);
-	newY = actor->y - FixedMul(finesine[angle], finesine[weaveXY] * 32);
+	newX = actor->X() - FixedMul(finecosine[angle], finesine[weaveXY] * 32);
+	newY = actor->Y() - FixedMul(finesine[angle], finesine[weaveXY] * 32);
 	weaveXY = (weaveXY + pr_random(5 << BOBTOFINESHIFT)) & FINEMASK;
 	newX += FixedMul(finecosine[angle], finesine[weaveXY] * 32);
 	newY += FixedMul(finesine[angle], finesine[weaveXY] * 32);
 	P_TryMove(actor, newX, newY, true);
-	actor->z -= finesine[weaveZ] * 16;
+	newZ = actor->Z();
+	newZ -= finesine[weaveZ] * 16;
 	weaveZ = (weaveZ + pr_random(5 << BOBTOFINESHIFT)) & FINEMASK;
-	actor->z += finesine[weaveZ] * 16;
+	newZ += finesine[weaveZ] * 16;
+	actor->SetZ(newZ);
 	actor->special2 = weaveZ + (weaveXY << 16);
 }
 
@@ -544,7 +546,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_ClericAttack)
 
 	if (!self->target) return 0;
 
-	AActor * missile = P_SpawnMissileZ (self, self->z + 40*FRACUNIT, self->target, PClass::FindActor("HolyMissile"));
+	AActor * missile = P_SpawnMissileZ (self, self->Z() + 40*FRACUNIT, self->target, PClass::FindActor ("HolyMissile"));
 	if (missile != NULL) missile->tracer = NULL;	// No initial target
 	S_Sound (self, CHAN_WEAPON, "HolySymbolFire", 1, ATTN_NORM);
 	return 0;

src/g_hexen/a_dragon.cpp

@@ -60,14 +60,14 @@ static void DragonSeek (AActor *actor, angle_t thresh, angle_t turnMax)
 	actor->velx = FixedMul (actor->Speed, finecosine[angle]);
 	actor->vely = FixedMul (actor->Speed, finesine[angle]);
 	dist = actor->AproxDistance (target) / actor->Speed;
-	if (actor->z+actor->height < target->z ||
-		target->z+target->height < actor->z)
+	if (actor->Top() < target->Z() ||
+		target->Top() < actor->Z())
 	{
 		if (dist < 1)
 		{
 			dist = 1;
 		}
-		actor->velz = (target->z - actor->z)/dist;
+		actor->velz = (target->Z() - actor->Z())/dist;
 	}
 	if (target->flags&MF_SHOOTABLE && pr_dragonseek() < 64)
 	{ // attack the destination mobj if it's attackable
@@ -266,11 +266,12 @@ DEFINE_ACTION_FUNCTION(AActor, A_DragonFX2)
 	delay = 16+(pr_dragonfx2()>>3);
 	for (i = 1+(pr_dragonfx2()&3); i; i--)
 	{
-		fixed_t x = self->x+((pr_dragonfx2()-128)<<14);
-		fixed_t y = self->y+((pr_dragonfx2()-128)<<14);
-		fixed_t z = self->z+((pr_dragonfx2()-128)<<12);
+		fixedvec3 pos = self->Vec3Offset(
+			((pr_dragonfx2()-128)<<14),
+			((pr_dragonfx2()-128)<<14),
+			((pr_dragonfx2()-128)<<12));
 
-		mo = Spawn ("DragonExplosion", x, y, z, ALLOW_REPLACE);
+		mo = Spawn ("DragonExplosion", pos, ALLOW_REPLACE);
 		if (mo)
 		{
 			mo->tics = delay+(pr_dragonfx2()&3)*i*2;
@@ -308,7 +309,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_DragonCheckCrash)
 {
 	PARAM_ACTION_PROLOGUE;
 
-	if (self->z <= self->floorz)
+	if (self->Z() <= self->floorz)
 	{
 		self->SetState (self->FindState ("Crash"));
 	}

src/g_hexen/a_fighterquietus.cpp

@@ -36,7 +36,7 @@ DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_DropWeaponPieces)
 		PClassActor *cls = j == 0 ?  p1 : j == 1 ? p2 : p3;
 		if (cls)
 		{
-			AActor *piece = Spawn (cls, self->x, self->y, self->z, ALLOW_REPLACE);
+			AActor *piece = Spawn (cls, self->Pos(), ALLOW_REPLACE);
 			if (piece != NULL)
 			{
 				piece->velx = self->velx + finecosine[fineang];
@@ -118,10 +118,11 @@ DEFINE_ACTION_FUNCTION(AActor, A_FSwordFlames)
 
 	for (i = 1+(pr_fswordflame()&3); i; i--)
 	{
-		fixed_t x = self->x+((pr_fswordflame()-128)<<12);
-		fixed_t y = self->y+((pr_fswordflame()-128)<<12);
-		fixed_t z = self->z+((pr_fswordflame()-128)<<11);
-		Spawn ("FSwordFlame", x, y, z, ALLOW_REPLACE);
+		fixedvec3 pos = self->Vec3Offset(
+			((pr_fswordflame()-128)<<12),
+			((pr_fswordflame()-128)<<12),
+			((pr_fswordflame()-128)<<11));
+		Spawn ("FSwordFlame", pos, ALLOW_REPLACE);
 	}
 	return 0;
 }

src/g_hexen/a_firedemon.cpp

@@ -32,7 +32,6 @@ static FRandom pr_firedemonsplotch ("FiredSplotch");
 void A_FiredSpawnRock (AActor *actor)
 {
 	AActor *mo;
-	int x,y,z;
 	PClassActor *rtype;
 
 	switch (pr_firedemonrock() % 5)
@@ -55,10 +54,11 @@ void A_FiredSpawnRock (AActor *actor)
 			break;
 	}
 
-	x = actor->x + ((pr_firedemonrock() - 128) << 12);
-	y = actor->y + ((pr_firedemonrock() - 128) << 12);
-	z = actor->z + ( pr_firedemonrock() << 11);
-	mo = Spawn (rtype, x, y, z, ALLOW_REPLACE);
+	fixedvec3 pos = actor->Vec3Offset(
+		((pr_firedemonrock() - 128) << 12),
+		((pr_firedemonrock() - 128) << 12),
+		( pr_firedemonrock() << 11));
+	mo = Spawn (rtype, pos, ALLOW_REPLACE);
 	if (mo)
 	{
 		mo->target = actor;
@@ -102,7 +102,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_SmBounce)
 	PARAM_ACTION_PROLOGUE;
 
 	// give some more velocity (x,y,&z)
-	self->z = self->floorz + FRACUNIT;
+	self->SetZ(self->floorz + FRACUNIT);
 	self->velz = (2*FRACUNIT) + (pr_smbounce() << 10);
 	self->velx = pr_smbounce()%3<<FRACBITS;
 	self->vely = pr_smbounce()%3<<FRACBITS;
@@ -145,13 +145,13 @@ DEFINE_ACTION_FUNCTION(AActor, A_FiredChase)
 	if (self->threshold) self->threshold--;
 
 	// Float up and down
-	self->z += finesine[weaveindex << BOBTOFINESHIFT] * 8;
+	self->AddZ(finesine[weaveindex << BOBTOFINESHIFT] * 8);
 	self->special1 = (weaveindex + 2) & 63;
 
 	// Ensure it stays above certain height
-	if (self->z < self->floorz + (64*FRACUNIT))
+	if (self->Z() < self->floorz + (64*FRACUNIT))
 	{
-		self->z += 2*FRACUNIT;
+		self->AddZ(2*FRACUNIT);
 	}
 
 	if(!self->target || !(self->target->flags&MF_SHOOTABLE))
@@ -233,14 +233,14 @@ DEFINE_ACTION_FUNCTION(AActor, A_FiredSplotch)
 
 	AActor *mo;
 
-	mo = Spawn ("FireDemonSplotch1", self->x, self->y, self->z, ALLOW_REPLACE);
+	mo = Spawn ("FireDemonSplotch1", self->Pos(), ALLOW_REPLACE);
 	if (mo)
 	{
 		mo->velx = (pr_firedemonsplotch() - 128) << 11;
 		mo->vely = (pr_firedemonsplotch() - 128) << 11;
 		mo->velz = (pr_firedemonsplotch() << 10) + FRACUNIT*3;
 	}
-	mo = Spawn ("FireDemonSplotch2", self->x, self->y, self->z, ALLOW_REPLACE);
+	mo = Spawn ("FireDemonSplotch2", self->Pos(), ALLOW_REPLACE);
 	if (mo)
 	{
 		mo->velx = (pr_firedemonsplotch() - 128) << 11;

src/g_hexen/a_flechette.cpp

@@ -42,10 +42,10 @@ bool AArtiPoisonBag1::Use (bool pickup)
 	angle_t angle = Owner->angle >> ANGLETOFINESHIFT;
 	AActor *mo;
 
-	mo = Spawn ("PoisonBag",
-		Owner->x+16*finecosine[angle],
-		Owner->y+24*finesine[angle], Owner->z-
-		Owner->floorclip+8*FRACUNIT, ALLOW_REPLACE);
+	mo = Spawn ("PoisonBag", Owner->Vec3Offset(
+		16*finecosine[angle],
+		24*finesine[angle], 
+		-Owner->floorclip+8*FRACUNIT), ALLOW_REPLACE);
 	if (mo)
 	{
 		mo->target = Owner;
@@ -70,10 +70,10 @@ bool AArtiPoisonBag2::Use (bool pickup)
 	angle_t angle = Owner->angle >> ANGLETOFINESHIFT;
 	AActor *mo;
 
-	mo = Spawn ("FireBomb",
-		Owner->x+16*finecosine[angle],
-		Owner->y+24*finesine[angle], Owner->z-
-		Owner->floorclip+8*FRACUNIT, ALLOW_REPLACE);
+	mo = Spawn ("FireBomb", Owner->Vec3Offset(
+		16*finecosine[angle],
+		24*finesine[angle], 
+		-Owner->floorclip+8*FRACUNIT), ALLOW_REPLACE);
 	if (mo)
 	{
 		mo->target = Owner;
@@ -97,8 +97,7 @@ bool AArtiPoisonBag3::Use (bool pickup)
 {
 	AActor *mo;
 
-	mo = Spawn("ThrowingBomb", Owner->x, Owner->y, 
-		Owner->z-Owner->floorclip+35*FRACUNIT + (Owner->player? Owner->player->crouchoffset : 0), ALLOW_REPLACE);
+	mo = Spawn("ThrowingBomb", Owner->PosPlusZ(-Owner->floorclip+35*FRACUNIT + (Owner->player? Owner->player->crouchoffset : 0)), ALLOW_REPLACE);
 	if (mo)
 	{
 		mo->angle = Owner->angle + (((pr_poisonbag()&7) - 4) << 24);
@@ -124,7 +123,7 @@ bool AArtiPoisonBag3::Use (bool pickup)
 		mo->velz = FixedMul(speed, finesine[modpitch]);
 		mo->velx = FixedMul(xyscale, finecosine[angle]) + (Owner->velx >> 1);
 		mo->vely = FixedMul(xyscale, finesine[angle]) + (Owner->vely >> 1);
-		mo->z += FixedMul(mo->Speed, finesine[orgpitch]);
+		mo->AddZ(FixedMul(mo->Speed, finesine[orgpitch]));
 
 		mo->target = Owner;
 		mo->tics -= pr_poisonbag()&3;
@@ -150,7 +149,7 @@ bool AArtiPoisonBagGiver::Use (bool pickup)
 	PClassActor *missiletype = PClass::FindActor(this->GetClass()->MissileName);
 	if (missiletype != NULL)
 	{
-		AActor *mo = Spawn (missiletype, Owner->x, Owner->y, Owner->z, ALLOW_REPLACE);
+		AActor *mo = Spawn (missiletype, Owner->Pos(), ALLOW_REPLACE);
 		if (mo != NULL)
 		{
 			if (mo->IsKindOf(RUNTIME_CLASS(AInventory)))
@@ -377,7 +376,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_PoisonBagInit)
 
 	AActor *mo;
 	
-	mo = Spawn<APoisonCloud> (self->x, self->y, self->z+28*FRACUNIT, ALLOW_REPLACE);
+	mo = Spawn<APoisonCloud> (self->PosPlusZ(28*FRACUNIT), ALLOW_REPLACE);
 	if (mo)
 	{
 		mo->target = self->target;
@@ -420,7 +419,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_PoisonBagDamage)
 	
 	P_RadiusAttack (self, self->target, 4, 40, self->DamageType, RADF_HURTSOURCE);
 	bobIndex = self->special2;
-	self->z += finesine[bobIndex << BOBTOFINESHIFT] >> 1;
+	self->AddZ(finesine[bobIndex << BOBTOFINESHIFT] >> 1);
 	self->special2 = (bobIndex + 1) & 63;
 	return 0;
 }
@@ -460,7 +459,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_CheckThrowBomb2)
 		< (3*3)/(2*2))
 	{
 		self->SetState (self->SpawnState + 6);
-		self->z = self->floorz;
+		self->SetZ(self->floorz);
 		self->velz = 0;
 		self->BounceFlags = BOUNCE_None;
 		self->flags &= ~MF_MISSILE;

src/g_hexen/a_flies.cpp

@@ -88,7 +88,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_FlyBuzz)
 	self->angle = ang;
 	self->args[0]++;
 	ang >>= ANGLETOFINESHIFT;
-	if (!P_TryMove(self, self->x + 6 * finecosine[ang], self->y + 6 * finesine[ang], true))
+	if (!P_TryMove(self, self->X() + 6 * finecosine[ang], self->Y() + 6 * finesine[ang], true))
 	{
 		self->SetIdle(true);
 		return 0;
@@ -99,7 +99,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_FlyBuzz)
 		self->vely += (pr_fly() - 128) << BOBTOFINESHIFT;
 	}
 	int zrand = pr_fly();
-	if (targ->z + 5*FRACUNIT < self->z && zrand > 150)
+	if (targ->Z() + 5*FRACUNIT < self->Z() && zrand > 150)
 	{
 		zrand = -zrand;
 	}

src/g_hexen/a_fog.cpp

@@ -45,7 +45,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_FogSpawn)
 	}
 	self->special1 = self->args[2];		// Reset frequency count
 
-	mo = Spawn (fogs[pr_fogspawn()%3], self->x, self->y, self->z, ALLOW_REPLACE);
+	mo = Spawn (fogs[pr_fogspawn()%3], self->Pos(), ALLOW_REPLACE);
 
 	if (mo)
 	{
@@ -90,7 +90,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_FogMove)
 	if ((self->args[3] % 4) == 0)
 	{
 		weaveindex = self->special2;
-		self->z += finesine[weaveindex << BOBTOFINESHIFT] * 4;
+		self->AddZ(finesine[weaveindex << BOBTOFINESHIFT] * 4);
 		self->special2 = (weaveindex + 1) & 63;
 	}
 

src/g_hexen/a_heresiarch.cpp

@@ -234,7 +234,6 @@ DEFINE_ACTION_FUNCTION(AActor, A_SorcSpinBalls)
 	PARAM_ACTION_PROLOGUE;
 
 	AActor *mo;
-	fixed_t z;
 
 	self->SpawnState += 2;		// [RH] Don't spawn balls again
 	A_SlowBalls(self);
@@ -242,17 +241,18 @@ DEFINE_ACTION_FUNCTION(AActor, A_SorcSpinBalls)
 	self->args[3] = SORC_NORMAL;
 	self->args[4] = SORCBALL_INITIAL_SPEED;		// Initial orbit speed
 	self->special1 = ANGLE_1;
-	z = self->z - self->floorclip + self->height;
 
-	mo = Spawn("SorcBall1", self->x, self->y, z, NO_REPLACE);
+	fixedvec3 pos = self->PosPlusZ(-self->floorclip + self->height);
+	
+	mo = Spawn("SorcBall1", pos, NO_REPLACE);
 	if (mo)
 	{
 		mo->target = self;
 		mo->special2 = SORCFX4_RAPIDFIRE_TIME;
 	}
-	mo = Spawn("SorcBall2", self->x, self->y, z, NO_REPLACE);
+	mo = Spawn("SorcBall2", pos, NO_REPLACE);
 	if (mo) mo->target = self;
-	mo = Spawn("SorcBall3", self->x, self->y, z, NO_REPLACE);
+	mo = Spawn("SorcBall3", pos, NO_REPLACE);
 	if (mo) mo->target = self;
 	return 0;
 }
@@ -276,7 +276,6 @@ DEFINE_ACTION_FUNCTION(AActor, A_SorcBallOrbit)
 	}
 
 	ASorcBall *actor;
-	int x,y;
 	angle_t angle, baseangle;
 	int mode = self->target->args[3];
 	AHeresiarch *parent = barrier_cast<AHeresiarch *>(self->target);
@@ -375,9 +374,12 @@ DEFINE_ACTION_FUNCTION(AActor, A_SorcBallOrbit)
 		S_Sound (actor, CHAN_BODY, "SorcererBallWoosh", 1, ATTN_NORM);
 	}
 	actor->special1 = angle;		// Set previous angle
-	x = parent->x + FixedMul(dist, finecosine[angle]);
-	y = parent->y + FixedMul(dist, finesine[angle]);
-	actor->SetOrigin (x, y, parent->z - parent->floorclip + parent->height);
+
+	fixedvec3 pos = parent->Vec3Offset(
+		FixedMul(dist, finecosine[angle]),
+		FixedMul(dist, finesine[angle]),
+		-parent->floorclip + parent->height);
+	actor->SetOrigin (pos, true);
 	actor->floorz = parent->floorz;
 	actor->ceilingz = parent->ceilingz;
 	return 0;
@@ -549,8 +551,7 @@ void ASorcBall2::CastSorcererSpell ()
 	AActor *parent = target;
 	AActor *mo;
 
-	fixed_t z = parent->z - parent->floorclip + SORC_DEFENSE_HEIGHT*FRACUNIT;
-	mo = Spawn("SorcFX2", x, y, z, ALLOW_REPLACE);
+	mo = Spawn("SorcFX2", PosPlusZ(-parent->floorclip + SORC_DEFENSE_HEIGHT*FRACUNIT), ALLOW_REPLACE);
 	parent->flags2 |= MF2_REFLECTIVE|MF2_INVULNERABLE;
 	parent->args[0] = SORC_DEFENSE_TIME;
 	if (mo) mo->target = parent;
@@ -676,7 +677,7 @@ void A_SorcOffense2(AActor *actor)
 		mo->special2 = 35*5/2;		// 5 seconds
 		dist = mo->AproxDistance(dest) / mo->Speed;
 		if(dist < 1) dist = 1;
-		mo->velz = (dest->z - mo->z) / dist;
+		mo->velz = (dest->Z() - mo->Z()) / dist;
 	}
 }
 
@@ -708,24 +709,19 @@ DEFINE_ACTION_FUNCTION(AActor, A_SorcBossAttack)
 DEFINE_ACTION_FUNCTION(AActor, A_SpawnFizzle)
 {
 	PARAM_ACTION_PROLOGUE;
-
-	fixed_t x,y,z;
 	fixed_t dist = 5*FRACUNIT;
-	angle_t angle = self->angle >> ANGLETOFINESHIFT;
 	fixed_t speed = self->Speed;
 	angle_t rangle;
 	AActor *mo;
 	int ix;
 
-	x = self->x + FixedMul(dist,finecosine[angle]);
-	y = self->y + FixedMul(dist,finesine[angle]);
-	z = self->z - self->floorclip + (self->height>>1);
+	fixedvec3 pos = self->Vec3Angle(dist, self->angle, -self->floorclip + (self->height >> 1));
 	for (ix=0; ix<5; ix++)
 	{
-		mo = Spawn("SorcSpark1", x, y, z, ALLOW_REPLACE);
+		mo = Spawn("SorcSpark1", pos, ALLOW_REPLACE);
 		if (mo)
 		{
-			rangle = angle + ((pr_heresiarch()%5) << 1);
+			rangle = (self->angle >> ANGLETOFINESHIFT) + ((pr_heresiarch()%5) << 1);
 			mo->velx = FixedMul(pr_heresiarch()%speed, finecosine[rangle]);
 			mo->vely = FixedMul(pr_heresiarch()%speed, finesine[rangle]);
 			mo->velz = FRACUNIT*2;
@@ -775,7 +771,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_SorcFX2Split)
 
 	AActor *mo;
 
-	mo = Spawn(self->GetClass(), self->x, self->y, self->z, NO_REPLACE);
+	mo = Spawn(self->GetClass(), self->Pos(), NO_REPLACE);
 	if (mo)
 	{
 		mo->target = self->target;
@@ -783,7 +779,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_SorcFX2Split)
 		mo->special1 = self->angle;					// Set angle
 		mo->SetState (mo->FindState("Orbit"));
 	}
-	mo = Spawn(self->GetClass(), self->x, self->y, self->z, NO_REPLACE);
+	mo = Spawn(self->GetClass(), self->Pos(), NO_REPLACE);
 	if (mo)
 	{
 		mo->target = self->target;
@@ -808,7 +804,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_SorcFX2Orbit)
 	PARAM_ACTION_PROLOGUE;
 
 	angle_t angle;
-	fixed_t x,y,z;
+	fixedvec3 pos;
 	AActor *parent = self->target;
 
 	// [RH] If no parent, then disappear
@@ -841,26 +837,28 @@ DEFINE_ACTION_FUNCTION(AActor, A_SorcFX2Orbit)
 	{
 		self->special1 += ANGLE_1*10;
 		angle = ((angle_t)self->special1) >> ANGLETOFINESHIFT;
-		x = parent->x + FixedMul(dist, finecosine[angle]);
-		y = parent->y + FixedMul(dist, finesine[angle]);
-		z = parent->z - parent->floorclip + SORC_DEFENSE_HEIGHT*FRACUNIT;
-		z += FixedMul(15*FRACUNIT,finecosine[angle]);
+		pos = parent->Vec3Offset(
+			FixedMul(dist, finecosine[angle]),
+			FixedMul(dist, finesine[angle]),
+			parent->floorclip + SORC_DEFENSE_HEIGHT*FRACUNIT);
+		pos.z += FixedMul(15*FRACUNIT,finecosine[angle]);
 		// Spawn trailer
-		Spawn("SorcFX2T1", x, y, z, ALLOW_REPLACE);
+		Spawn("SorcFX2T1", pos, ALLOW_REPLACE);
 	}
 	else							// Clock wise
 	{
 		self->special1 -= ANGLE_1*10;
 		angle = ((angle_t)self->special1) >> ANGLETOFINESHIFT;
-		x = parent->x + FixedMul(dist, finecosine[angle]);
-		y = parent->y + FixedMul(dist, finesine[angle]);
-		z = parent->z - parent->floorclip + SORC_DEFENSE_HEIGHT*FRACUNIT;
-		z += FixedMul(20*FRACUNIT,finesine[angle]);
+		pos = parent->Vec3Offset(
+			FixedMul(dist, finecosine[angle]),
+			FixedMul(dist, finesine[angle]),
+			parent->floorclip + SORC_DEFENSE_HEIGHT*FRACUNIT);
+		pos.z += FixedMul(20*FRACUNIT,finesine[angle]);
 		// Spawn trailer
-		Spawn("SorcFX2T1", x, y, z, ALLOW_REPLACE);
+		Spawn("SorcFX2T1", pos, ALLOW_REPLACE);
 	}
 
-	self->SetOrigin (x, y, z);
+	self->SetOrigin (pos, true);
 	self->floorz = parent->floorz;
 	self->ceilingz = parent->ceilingz;
 	return 0;
@@ -879,7 +877,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_SpawnBishop)
 	PARAM_ACTION_PROLOGUE;
 
 	AActor *mo;
-	mo = Spawn("Bishop", self->x, self->y, self->z, ALLOW_REPLACE);
+	mo = Spawn("Bishop", self->Pos(), ALLOW_REPLACE);
 	if (mo)
 	{
 		if (!P_TestMobjLocation(mo))
@@ -907,7 +905,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_SorcererBishopEntry)
 {
 	PARAM_ACTION_PROLOGUE;
 
-	Spawn("SorcFX3Explosion", self->x, self->y, self->z, ALLOW_REPLACE);
+	Spawn("SorcFX3Explosion", self->Pos(), ALLOW_REPLACE);
 	S_Sound (self, CHAN_VOICE, self->SeeSound, 1, ATTN_NORM);
 	return 0;
 }

src/g_hexen/a_hexenspecialdecs.cpp

@@ -62,7 +62,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_PotteryExplode)
 
 	for(i = (pr_pottery()&3)+3; i; i--)
 	{
-		mo = Spawn ("PotteryBit", self->x, self->y, self->z, ALLOW_REPLACE);
+		mo = Spawn ("PotteryBit", self->Pos(), ALLOW_REPLACE);
 		if (mo)
 		{
 			mo->SetState (mo->SpawnState + (pr_pottery()%5));
@@ -79,7 +79,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_PotteryExplode)
 		if (!((level.flags2 & LEVEL2_NOMONSTERS) || (dmflags & DF_NO_MONSTERS))
 		|| !(GetDefaultByType (type)->flags3 & MF3_ISMONSTER))
 		{ // Only spawn monsters if not -nomonsters
-			Spawn (type, self->x, self->y, self->z, ALLOW_REPLACE);
+			Spawn (type, self->Pos(), ALLOW_REPLACE);
 		}
 	}
 	return 0;
@@ -141,7 +141,7 @@ IMPLEMENT_CLASS (AZCorpseLynchedNoHeart)
 void AZCorpseLynchedNoHeart::PostBeginPlay ()
 {
 	Super::PostBeginPlay ();
-	Spawn ("BloodPool", x, y, floorz, ALLOW_REPLACE);
+	Spawn ("BloodPool", X(), Y(), floorz, ALLOW_REPLACE);
 }
 
 //============================================================================
@@ -156,7 +156,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_CorpseBloodDrip)
 
 	if (pr_drip() <= 128)
 	{
-		Spawn ("CorpseBloodDrip", self->x, self->y, self->z + self->height/2, ALLOW_REPLACE);
+		Spawn ("CorpseBloodDrip", self->PosPlusZ(self->height/2), ALLOW_REPLACE);
 	}
 	return 0;
 }
@@ -176,7 +176,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_CorpseExplode)
 
 	for (i = (pr_foo()&3)+3; i; i--)
 	{
-		mo = Spawn ("CorpseBit", self->x, self->y, self->z, ALLOW_REPLACE);
+		mo = Spawn ("CorpseBit", self->Pos(), ALLOW_REPLACE);
 		if (mo)
 		{
 			mo->SetState (mo->SpawnState + (pr_foo()%3));
@@ -186,7 +186,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_CorpseExplode)
 		}
 	}
 	// Spawn a skull
-	mo = Spawn ("CorpseBit", self->x, self->y, self->z, ALLOW_REPLACE);
+	mo = Spawn ("CorpseBit", self->Pos(), ALLOW_REPLACE);
 	if (mo)
 	{
 		mo->SetState (mo->SpawnState + 3);
@@ -215,9 +215,10 @@ DEFINE_ACTION_FUNCTION(AActor, A_LeafSpawn)
 	for (i = (pr_leaf()&3)+1; i; i--)
 	{
 		mo = Spawn (pr_leaf()&1 ? PClass::FindActor("Leaf1") : PClass::FindActor("Leaf2"),
-			self->x + (pr_leaf.Random2()<<14),
-			self->y + (pr_leaf.Random2()<<14),
-			self->z + (pr_leaf()<<14), ALLOW_REPLACE);
+			self->Vec3Offset(
+			(pr_leaf.Random2()<<14),
+			(pr_leaf.Random2()<<14),
+			(pr_leaf()<<14)), ALLOW_REPLACE);
 		if (mo)
 		{
 			P_ThrustMobj (mo, self->angle, (pr_leaf()<<9)+3*FRACUNIT);
@@ -306,9 +307,10 @@ DEFINE_ACTION_FUNCTION(AActor, A_SoAExplode)
 
 	for (i = 0; i < 10; i++)
 	{
-		mo = Spawn ("ZArmorChunk", self->x+((pr_soaexplode()-128)<<12),
-			self->y+((pr_soaexplode()-128)<<12), 
-			self->z+(pr_soaexplode()*self->height/256), ALLOW_REPLACE);
+		mo = Spawn ("ZArmorChunk", self->Vec3Offset(
+			((pr_soaexplode()-128)<<12),
+			((pr_soaexplode()-128)<<12), 
+			(pr_soaexplode()*self->height/256)), ALLOW_REPLACE);
 		if (mo)
 		{
 			mo->SetState (mo->SpawnState + i);
@@ -324,7 +326,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_SoAExplode)
 		if (!((level.flags2 & LEVEL2_NOMONSTERS) || (dmflags & DF_NO_MONSTERS))
 		|| !(GetDefaultByType (type)->flags3 & MF3_ISMONSTER))
 		{ // Only spawn monsters if not -nomonsters
-			Spawn (type, self->x, self->y, self->z, ALLOW_REPLACE);
+			Spawn (type, self->Pos(), ALLOW_REPLACE);
 		}
 	}
 	S_Sound (self, CHAN_BODY, self->DeathSound, 1, ATTN_NORM);

src/g_hexen/a_iceguy.cpp

@@ -37,10 +37,10 @@ DEFINE_ACTION_FUNCTION(AActor, A_IceGuyLook)
 		dist = ((pr_iceguylook()-128)*self->radius)>>7;
 		an = (self->angle+ANG90)>>ANGLETOFINESHIFT;
 
-		Spawn (WispTypes[pr_iceguylook()&1],
-			self->x+FixedMul(dist, finecosine[an]),
-			self->y+FixedMul(dist, finesine[an]),
-			self->z+60*FRACUNIT, ALLOW_REPLACE);
+		Spawn(WispTypes[pr_iceguylook() & 1], self->Vec3Offset(
+			FixedMul(dist, finecosine[an]),
+			FixedMul(dist, finesine[an]),
+			60 * FRACUNIT), ALLOW_REPLACE);
 	}
 	return 0;
 }
@@ -65,10 +65,10 @@ DEFINE_ACTION_FUNCTION(AActor, A_IceGuyChase)
 		dist = ((pr_iceguychase()-128)*self->radius)>>7;
 		an = (self->angle+ANG90)>>ANGLETOFINESHIFT;
 
-		mo = Spawn (WispTypes[pr_iceguychase()&1],
-			self->x+FixedMul(dist, finecosine[an]),
-			self->y+FixedMul(dist, finesine[an]),
-			self->z+60*FRACUNIT, ALLOW_REPLACE);
+		mo = Spawn(WispTypes[pr_iceguychase() & 1], self->Vec3Offset(
+			FixedMul(dist, finecosine[an]),
+			FixedMul(dist, finesine[an]),
+			60 * FRACUNIT), ALLOW_REPLACE);
 		if (mo)
 		{
 			mo->velx = self->velx;
@@ -90,22 +90,12 @@ DEFINE_ACTION_FUNCTION(AActor, A_IceGuyAttack)
 {
 	PARAM_ACTION_PROLOGUE;
 
-	fixed_t an;
-
 	if(!self->target) 
 	{
 		return 0;
 	}
-	an = (self->angle+ANG90)>>ANGLETOFINESHIFT;
-	P_SpawnMissileXYZ(self->x+FixedMul(self->radius>>1,
-		finecosine[an]), self->y+FixedMul(self->radius>>1,
-		finesine[an]), self->z+40*FRACUNIT, self, self->target,
-		PClass::FindActor("IceGuyFX"));
-	an = (self->angle-ANG90)>>ANGLETOFINESHIFT;
-	P_SpawnMissileXYZ(self->x+FixedMul(self->radius>>1,
-		finecosine[an]), self->y+FixedMul(self->radius>>1,
-		finesine[an]), self->z+40*FRACUNIT, self, self->target,
-		PClass::FindActor("IceGuyFX"));
+	P_SpawnMissileXYZ(self->Vec3Angle(self->radius>>1, self->angle+ANG90, 40*FRACUNIT), self, self->target, PClass::FindActor ("IceGuyFX"));
+	P_SpawnMissileXYZ(self->Vec3Angle(self->radius>>1, self->angle-ANG90, 40*FRACUNIT), self, self->target, PClass::FindActor ("IceGuyFX"));
 	S_Sound (self, CHAN_WEAPON, self->AttackSound, 1, ATTN_NORM);
 	return 0;
 }
@@ -143,7 +133,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_IceGuyMissileExplode)
 
 	for (i = 0; i < 8; i++)
 	{
-		mo = P_SpawnMissileAngleZ (self, self->z+3*FRACUNIT, 
+		mo = P_SpawnMissileAngleZ (self, self->Z()+3*FRACUNIT, 
 			PClass::FindActor("IceGuyFX2"), i*ANG45, (fixed_t)(-0.3*FRACUNIT));
 		if (mo)
 		{

src/g_hexen/a_korax.cpp

@@ -99,7 +99,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_KoraxChase)
 		spot = iterator.Next ();
 		if (spot != NULL)
 		{
-			P_Teleport (self, spot->x, spot->y, ONFLOORZ, spot->angle, true, true, false);
+			P_Teleport (self, spot->X(), spot->Y(), ONFLOORZ, spot->angle, true, true, false);
 		}
 
 		P_StartScript (self, NULL, 249, NULL, NULL, 0, 0);
@@ -141,7 +141,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_KoraxChase)
 			self->tracer = spot;
 			if (spot)
 			{
-				P_Teleport (self, spot->x, spot->y, ONFLOORZ, spot->angle, true, true, false);
+				P_Teleport (self, spot->X(), spot->Y(), ONFLOORZ, spot->angle, true, true, false);
 			}
 		}
 	}
@@ -267,8 +267,6 @@ DEFINE_ACTION_FUNCTION(AActor, A_KoraxMissile)
 DEFINE_ACTION_FUNCTION(AActor, A_KoraxCommand)
 {
 	PARAM_ACTION_PROLOGUE;
-
-	fixed_t x,y,z;
 	angle_t ang;
 	int numcommands;
 
@@ -276,10 +274,11 @@ DEFINE_ACTION_FUNCTION(AActor, A_KoraxCommand)
 
 	// Shoot stream of lightning to ceiling
 	ang = (self->angle - ANGLE_90) >> ANGLETOFINESHIFT;
-	x = self->x + KORAX_COMMAND_OFFSET * finecosine[ang];
-	y = self->y + KORAX_COMMAND_OFFSET * finesine[ang];
-	z = self->z + KORAX_COMMAND_HEIGHT*FRACUNIT;
-	Spawn("KoraxBolt", x, y, z, ALLOW_REPLACE);
+	fixedvec3 pos = self->Vec3Offset(
+		KORAX_COMMAND_OFFSET * finecosine[ang],
+		KORAX_COMMAND_OFFSET * finesine[ang],
+		KORAX_COMMAND_HEIGHT*FRACUNIT);
+	Spawn("KoraxBolt", pos, ALLOW_REPLACE);
 
 	if (self->health <= (self->SpawnHealth() >> 1))
 	{
@@ -331,14 +330,13 @@ void KoraxFire (AActor *actor, PClassActor *type, int arm)
 	};
 
 	angle_t ang;
-	fixed_t x,y,z;
 
-	ang = (actor->angle + (arm < 3 ? -KORAX_DELTAANGLE : KORAX_DELTAANGLE))
-		>> ANGLETOFINESHIFT;
-	x = actor->x + extension[arm] * finecosine[ang];
-	y = actor->y + extension[arm] * finesine[ang];
-	z = actor->z - actor->floorclip + armheight[arm];
-	P_SpawnKoraxMissile (x, y, z, actor, actor->target, type);
+	ang = (actor->angle + (arm < 3 ? -KORAX_DELTAANGLE : KORAX_DELTAANGLE)) >> ANGLETOFINESHIFT;
+	fixedvec3 pos = actor->Vec3Offset(
+		extension[arm] * finecosine[ang],
+		extension[arm] * finesine[ang],
+		-actor->floorclip + armheight[arm]);
+	P_SpawnKoraxMissile (pos.x, pos.y, pos.z, actor, actor->target, type);
 }
 
 //============================================================================
@@ -393,11 +391,11 @@ void A_KSpiritSeeker (AActor *actor, angle_t thresh, angle_t turnMax)
 	actor->vely = FixedMul (actor->Speed, finesine[angle]);
 
 	if (!(level.time&15) 
-		|| actor->z > target->z+(target->GetDefault()->height)
-		|| actor->z+actor->height < target->z)
+		|| actor->Z() > target->Z()+(target->GetDefault()->height)
+		|| actor->Top() < target->Z())
 	{
-		newZ = target->z+((pr_kspiritseek()*target->GetDefault()->height)>>8);
-		deltaZ = newZ-actor->z;
+		newZ = target->Z()+((pr_kspiritseek()*target->GetDefault()->height)>>8);
+		deltaZ = newZ-actor->Z();
 		if (abs(deltaZ) > 15*FRACUNIT)
 		{
 			if(deltaZ > 0)
@@ -482,11 +480,11 @@ DEFINE_ACTION_FUNCTION(AActor, A_KBoltRaise)
 	fixed_t z;
 
 	// Spawn a child upward
-	z = self->z + KORAX_BOLT_HEIGHT;
+	z = self->Z() + KORAX_BOLT_HEIGHT;
 
 	if ((z + KORAX_BOLT_HEIGHT) < self->ceilingz)
 	{
-		mo = Spawn("KoraxBolt", self->x, self->y, z, ALLOW_REPLACE);
+		mo = Spawn("KoraxBolt", self->X(), self->Y(), z, ALLOW_REPLACE);
 		if (mo)
 		{
 			mo->special1 = KORAX_BOLT_LIFETIME;
@@ -529,6 +527,6 @@ AActor *P_SpawnKoraxMissile (fixed_t x, fixed_t y, fixed_t z,
 	{
 		dist = 1;
 	}
-	th->velz = (dest->z-z+(30*FRACUNIT))/dist;
+	th->velz = (dest->Z()-z+(30*FRACUNIT))/dist;
 	return (P_CheckMissileSpawn(th, source->radius) ? th : NULL);
 }

src/g_hexen/a_magecone.cpp

@@ -128,7 +128,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_ShedShard)
 	// every so many calls, spawn a new missile in its set directions
 	if (spawndir & SHARDSPAWN_LEFT)
 	{
-		mo = P_SpawnMissileAngleZSpeed (self, self->z, RUNTIME_CLASS(AFrostMissile), self->angle+(ANG45/9),
+		mo = P_SpawnMissileAngleZSpeed (self, self->Z(), RUNTIME_CLASS(AFrostMissile), self->angle+(ANG45/9),
 											 0, (20+2*spermcount)<<FRACBITS, self->target);
 		if (mo)
 		{
@@ -140,7 +140,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_ShedShard)
 	}
 	if (spawndir & SHARDSPAWN_RIGHT)
 	{
-		mo = P_SpawnMissileAngleZSpeed (self, self->z, RUNTIME_CLASS(AFrostMissile), self->angle-(ANG45/9),
+		mo = P_SpawnMissileAngleZSpeed (self, self->Z(), RUNTIME_CLASS(AFrostMissile), self->angle-(ANG45/9),
 											 0, (20+2*spermcount)<<FRACBITS, self->target);
 		if (mo)
 		{
@@ -152,7 +152,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_ShedShard)
 	}
 	if (spawndir & SHARDSPAWN_UP)
 	{
-		mo = P_SpawnMissileAngleZSpeed (self, self->z+8*FRACUNIT, RUNTIME_CLASS(AFrostMissile), self->angle, 
+		mo = P_SpawnMissileAngleZSpeed (self, self->Z()+8*FRACUNIT, RUNTIME_CLASS(AFrostMissile), self->angle, 
 											 0, (15+2*spermcount)<<FRACBITS, self->target);
 		if (mo)
 		{
@@ -167,7 +167,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_ShedShard)
 	}
 	if (spawndir & SHARDSPAWN_DOWN)
 	{
-		mo = P_SpawnMissileAngleZSpeed (self, self->z-4*FRACUNIT, RUNTIME_CLASS(AFrostMissile), self->angle, 
+		mo = P_SpawnMissileAngleZSpeed (self, self->Z()-4*FRACUNIT, RUNTIME_CLASS(AFrostMissile), self->angle, 
 											 0, (15+2*spermcount)<<FRACBITS, self->target);
 		if (mo)
 		{

src/g_hexen/a_magelightning.cpp

@@ -156,12 +156,12 @@ DEFINE_ACTION_FUNCTION(AActor, A_LightningClip)
 		{
 			return 0;
 		}
-		self->z = self->floorz;
+		self->SetZ(self->floorz);
 		target = self->lastenemy->tracer;
 	}
 	else if (self->flags3 & MF3_CEILINGHUGGER)
 	{
-		self->z = self->ceilingz-self->height;
+		self->SetZ(self->ceilingz-self->height);
 		target = self->tracer;
 	}
 	if (self->flags3 & MF3_FLOORHUGGER)
@@ -240,9 +240,11 @@ DEFINE_ACTION_FUNCTION(AActor, A_LightningZap)
 	{
 		deltaZ = -10*FRACUNIT;
 	}
-	mo = Spawn(lightning, self->x+((pr_zap()-128)*self->radius/256), 
-		self->y+((pr_zap()-128)*self->radius/256), 
-		self->z+deltaZ, ALLOW_REPLACE);
+	mo = Spawn(lightning,
+		self->Vec3Offset(
+			((pr_zap() - 128)*self->radius / 256),
+			((pr_zap() - 128)*self->radius / 256),
+			deltaZ), ALLOW_REPLACE);
 	if (mo)
 	{
 		mo->lastenemy = self;
@@ -351,7 +353,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_LastZap)
 	{
 		lightning = PClass::FindActor(NAME_LightningZap);
 	}
-	mo = Spawn(lightning, self->x, self->y, self->z, ALLOW_REPLACE);
+	mo = Spawn(lightning, self->Pos(), ALLOW_REPLACE);
 	if (mo)
 	{
 		mo->SetState (mo->FindState (NAME_Death));

src/g_hexen/a_magestaff.cpp

@@ -142,8 +142,8 @@ DEFINE_ACTION_FUNCTION(AActor, A_MStaffAttack)
 	P_AimLineAttack (self, angle, PLAYERMISSILERANGE, &linetarget, ANGLE_1*32);
 	if (linetarget == NULL)
 	{
-		BlockCheckLine.x = self->x;
-		BlockCheckLine.y = self->y;
+		BlockCheckLine.x = self->X();
+		BlockCheckLine.y = self->Y();
 		BlockCheckLine.dx = -finesine[angle >> ANGLETOFINESHIFT];
 		BlockCheckLine.dy = -finecosine[angle >> ANGLETOFINESHIFT];
 		linetarget = P_BlockmapSearch (self, 10, FrontBlockCheck);
@@ -211,7 +211,7 @@ static AActor *FrontBlockCheck (AActor *mo, int index, void *)
 	{
 		if (link->Me != mo)
 		{
-			if (P_PointOnDivlineSide (link->Me->x, link->Me->y, &BlockCheckLine) == 0 &&
+			if (P_PointOnDivlineSide (link->Me->X(), link->Me->Y(), &BlockCheckLine) == 0 &&
 				mo->IsOkayToAttack (link->Me))
 			{
 				return link->Me;
@@ -231,7 +231,7 @@ void MStaffSpawn2 (AActor *actor, angle_t angle)
 {
 	AActor *mo;
 
-	mo = P_SpawnMissileAngleZ (actor, actor->z+40*FRACUNIT,
+	mo = P_SpawnMissileAngleZ (actor, actor->Z()+40*FRACUNIT,
 		RUNTIME_CLASS(AMageStaffFX2), angle, 0);
 	if (mo)
 	{

src/g_hexen/a_pig.cpp

@@ -101,7 +101,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_PigPain)
 	PARAM_ACTION_PROLOGUE;
 
 	CALL_ACTION(A_Pain, self);
-	if (self->z <= self->floorz)
+	if (self->Z() <= self->floorz)
 	{
 		self->velz = FRACUNIT*7/2;
 	}

src/g_hexen/a_serpent.cpp

@@ -228,9 +228,11 @@ DEFINE_ACTION_FUNCTION(AActor, A_SerpentSpawnGibs)
 
 	for (int i = countof(GibTypes)-1; i >= 0; --i)
 	{
-		mo = Spawn (GibTypes[i],
-			self->x+((pr_serpentgibs()-128)<<12), 
-			self->y+((pr_serpentgibs()-128)<<12),
+		fixedvec2 pos = self->Vec2Offset(
+			((pr_serpentgibs() - 128) << 12),
+			((pr_serpentgibs() - 128) << 12));
+
+		mo = Spawn (GibTypes[i], pos.x, pos.y,
 			self->floorz+FRACUNIT, ALLOW_REPLACE);
 		if (mo)
 		{
@@ -294,7 +296,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_SerpentHeadCheck)
 {
 	PARAM_ACTION_PROLOGUE;
 
-	if (self->z <= self->floorz)
+	if (self->Z() <= self->floorz)
 	{
 		if (Terrains[P_GetThingFloorType(self)].IsLiquid)
 		{

src/g_hexen/a_spike.cpp

@@ -100,7 +100,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_ThrustInitDn)
 	self->flags2 = MF2_NOTELEPORT|MF2_FLOORCLIP;
 	self->renderflags = RF_INVISIBLE;
 	static_cast<AThrustFloor *>(self)->DirtClump =
-		Spawn("DirtClump", self->x, self->y, self->z, ALLOW_REPLACE);
+		Spawn("DirtClump", self->Pos(), ALLOW_REPLACE);
 	return 0;
 }
 
@@ -154,7 +154,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_ThrustImpale)
 	PARAM_ACTION_PROLOGUE;
 
 	AActor *thing;
-	FBlockThingsIterator it(FBoundingBox(self->x, self->y, self->radius));
+	FBlockThingsIterator it(FBoundingBox(self->X(), self->Y(), self->radius));
 	while ((thing = it.Next()))
 	{
 		if (!thing->intersects(self))

src/g_hexen/a_summon.cpp

@@ -53,13 +53,13 @@ DEFINE_ACTION_FUNCTION(AActor, A_Summon)
 
 	AMinotaurFriend *mo;
 
-	mo = Spawn<AMinotaurFriend> (self->x, self->y, self->z, ALLOW_REPLACE);
+	mo = Spawn<AMinotaurFriend> (self->Pos(), ALLOW_REPLACE);
 	if (mo)
 	{
 		if (P_TestMobjLocation(mo) == false || !self->tracer)
 		{ // Didn't fit - change back to artifact
 			mo->Destroy ();
-			AActor *arti = Spawn<AArtiDarkServant> (self->x, self->y, self->z, ALLOW_REPLACE);
+			AActor *arti = Spawn<AArtiDarkServant> (self->Pos(), ALLOW_REPLACE);
 			if (arti) arti->flags |= MF_DROPPED;
 			return 0;
 		}
@@ -78,7 +78,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_Summon)
 		}
 
 		// Make smoke puff
-		Spawn ("MinotaurSmoke", self->x, self->y, self->z, ALLOW_REPLACE);
+		Spawn ("MinotaurSmoke", self->Pos(), ALLOW_REPLACE);
 		S_Sound (self, CHAN_VOICE, mo->ActiveSound, 1, ATTN_NORM);
 	}
 	return 0;

src/g_hexen/a_teleportother.cpp

@@ -51,7 +51,7 @@ static void TeloSpawn (AActor *source, const char *type)
 {
 	AActor *fx;
 
-	fx = Spawn (type, source->x, source->y, source->z, ALLOW_REPLACE);
+	fx = Spawn (type, source->Pos(), ALLOW_REPLACE);
 	if (fx)
 	{
 		fx->special1 = TELEPORT_LIFE;			// Lifetime countdown

src/g_hexen/a_wraith.cpp

@@ -31,12 +31,12 @@ DEFINE_ACTION_FUNCTION(AActor, A_WraithInit)
 {
 	PARAM_ACTION_PROLOGUE;
 
-	self->z += 48<<FRACBITS;
+	self->AddZ(48<<FRACBITS);
 
 	// [RH] Make sure the wraith didn't go into the ceiling
-	if (self->z + self->height > self->ceilingz)
+	if (self->Top() > self->ceilingz)
 	{
-		self->z = self->ceilingz - self->height;
+		self->SetZ(self->ceilingz - self->height);
 	}
 
 	self->special1 = 0;			// index into floatbob
@@ -124,7 +124,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_WraithFX2)
 
 	for (i = 2; i; --i)
 	{
-		mo = Spawn ("WraithFX2", self->x, self->y, self->z, ALLOW_REPLACE);
+		mo = Spawn ("WraithFX2", self->Pos(), ALLOW_REPLACE);
 		if(mo)
 		{
 			if (pr_wraithfx2 ()<128)
@@ -164,12 +164,16 @@ DEFINE_ACTION_FUNCTION(AActor, A_WraithFX3)
 
 	while (numdropped-- > 0)
 	{
-		mo = Spawn ("WraithFX3", self->x, self->y, self->z, ALLOW_REPLACE);
+		fixedvec3 pos = self->Vec3Offset(
+			(pr_wraithfx3()-128)<<11,
+			(pr_wraithfx3()-128)<<11,
+			(pr_wraithfx3()<<10));
+
+		mo = Spawn ("WraithFX3", pos, ALLOW_REPLACE);
 		if (mo)
 		{
-			mo->x += (pr_wraithfx3()-128)<<11;
-			mo->y += (pr_wraithfx3()-128)<<11;
-			mo->z += (pr_wraithfx3()<<10);
+			mo->floorz = self->floorz;
+			mo->ceilingz = self->ceilingz;
 			mo->target = self;
 		}
 	}
@@ -213,23 +217,31 @@ void A_WraithFX4 (AActor *self)
 
 	if (spawn4)
 	{
-		mo = Spawn ("WraithFX4", self->x, self->y, self->z, ALLOW_REPLACE);
+		fixedvec3 pos = self->Vec3Offset(
+			(pr_wraithfx4()-128)<<12,
+			(pr_wraithfx4()-128)<<12,
+			(pr_wraithfx4()<<10));
+
+		mo = Spawn ("WraithFX4", pos, ALLOW_REPLACE);
 		if (mo)
 		{
-			mo->x += (pr_wraithfx4()-128)<<12;
-			mo->y += (pr_wraithfx4()-128)<<12;
-			mo->z += (pr_wraithfx4()<<10);
+			mo->floorz = self->floorz;
+			mo->ceilingz = self->ceilingz;
 			mo->target = self;
 		}
 	}
 	if (spawn5)
 	{
-		mo = Spawn ("WraithFX5", self->x, self->y, self->z, ALLOW_REPLACE);
+		fixedvec3 pos = self->Vec3Offset(
+			(pr_wraithfx4()-128)<<12,
+			(pr_wraithfx4()-128)<<12,
+			(pr_wraithfx4()<<10));
+
+		mo = Spawn ("WraithFX5", pos, ALLOW_REPLACE);
 		if (mo)
 		{
-			mo->x += (pr_wraithfx4()-128)<<11;
-			mo->y += (pr_wraithfx4()-128)<<11;
-			mo->z += (pr_wraithfx4()<<10);
+			mo->floorz = self->floorz;
+			mo->ceilingz = self->ceilingz;
 			mo->target = self;
 		}
 	}
@@ -246,7 +258,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_WraithChase)
 	PARAM_ACTION_PROLOGUE;
 
 	int weaveindex = self->special1;
-	self->z += finesine[weaveindex << BOBTOFINESHIFT] * 8;
+	self->AddZ(finesine[weaveindex << BOBTOFINESHIFT] * 8);
 	self->special1 = (weaveindex + 2) & 63;
 //	if (self->floorclip > 0)
 //	{

src/g_level.cpp

@@ -1220,9 +1220,7 @@ void G_FinishTravel ()
 				pawn->angle = pawndup->angle;
 				pawn->pitch = pawndup->pitch;
 			}
-			pawn->x = pawndup->x;
-			pawn->y = pawndup->y;
-			pawn->z = pawndup->z;
+			pawn->SetXYZ(pawndup->X(), pawndup->Y(), pawndup->Z());
 			pawn->velx = pawndup->velx;
 			pawn->vely = pawndup->vely;
 			pawn->velz = pawndup->velz;

src/g_raven/a_minotaur.cpp

@@ -194,8 +194,8 @@ DEFINE_ACTION_FUNCTION(AActor, A_MinotaurDecide)
 		S_Sound (self, CHAN_WEAPON, "minotaur/sight", 1, ATTN_NORM);
 	}
 	dist = self->AproxDistance (target);
-	if (target->z+target->height > self->z
-		&& target->z+target->height < self->z+self->height
+	if (target->Top() > self->Z()
+		&& target->Top() < self->Top()
 		&& dist < (friendly ? 16*64*FRACUNIT : 8*64*FRACUNIT)
 		&& dist > 1*64*FRACUNIT
 		&& pr_minotaurdecide() < 150)
@@ -213,7 +213,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_MinotaurDecide)
 		self->vely = FixedMul (MNTR_CHARGE_SPEED, finesine[angle]);
 		self->special1 = TICRATE/2; // Charge duration
 	}
-	else if (target->z == target->floorz
+	else if (target->Z() == target->floorz
 		&& dist < 9*64*FRACUNIT
 		&& pr_minotaurdecide() < (friendly ? 100 : 220))
 	{ // Floor fire attack
@@ -257,7 +257,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_MinotaurCharge)
 		{
 			type = PClass::FindActor("PunchPuff");
 		}
-		puff = Spawn (type, self->x, self->y, self->z, ALLOW_REPLACE);
+		puff = Spawn (type, self->Pos(), ALLOW_REPLACE);
 		puff->velz = 2*FRACUNIT;
 		self->special1--;
 	}
@@ -301,7 +301,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_MinotaurAtk2)
 		P_TraceBleed (newdam > 0 ? newdam : damage, self->target, self);
 		return 0;
 	}
-	z = self->z + 40*FRACUNIT;
+	z = self->Z() + 40*FRACUNIT;
 	PClassActor *fx = PClass::FindActor("MinotaurFX1");
 	if (fx)
 	{
@@ -391,10 +391,11 @@ DEFINE_ACTION_FUNCTION(AActor, A_MntrFloorFire)
 	AActor *mo;
 	fixed_t x, y;
 
-	self->z = self->floorz;
-	x = self->x + (pr_fire.Random2 () << 10);
-	y = self->y + (pr_fire.Random2 () << 10);
-	mo = Spawn("MinotaurFX3", x, y, self->floorz, ALLOW_REPLACE);
+	self->SetZ(self->floorz);
+	fixedvec2 pos = self->Vec2Offset(
+		(pr_fire.Random2 () << 10),
+		(pr_fire.Random2 () << 10));
+	mo = Spawn("MinotaurFX3", pos.x, pos.y, self->floorz, ALLOW_REPLACE);
 	mo->target = self->target;
 	mo->velx = 1; // Force block checking
 	P_CheckMissileSpawn (mo, self->radius);

src/g_shared/a_action.cpp

@@ -291,14 +291,14 @@ DEFINE_ACTION_FUNCTION(AActor, A_FreezeDeathChunks)
 	i = (pr_freeze.Random2()) % (numChunks/4);
 	for (i = MAX (24, numChunks + i); i >= 0; i--)
 	{
-		mo = Spawn("IceChunk", 
-			self->x + (((pr_freeze()-128)*self->radius)>>7), 
-			self->y + (((pr_freeze()-128)*self->radius)>>7), 
-			self->z + (pr_freeze()*self->height/255), ALLOW_REPLACE);
+		mo = Spawn("IceChunk", self->Vec3Offset(
+			(((pr_freeze()-128)*self->radius)>>7), 
+			(((pr_freeze()-128)*self->radius)>>7), 
+			(pr_freeze()*self->height/255)), ALLOW_REPLACE);
 		if (mo)
 		{
 				mo->SetState (mo->SpawnState + (pr_freeze()%3));
-			mo->velz = FixedDiv(mo->z - self->z, self->height)<<2;
+			mo->velz = FixedDiv(mo->Z() - self->Z(), self->height)<<2;
 			mo->velx = pr_freeze.Random2 () << (FRACBITS-7);
 			mo->vely = pr_freeze.Random2 () << (FRACBITS-7);
 			CALL_ACTION(A_IceSetTics, mo); // set a random tic wait
@@ -308,11 +308,10 @@ DEFINE_ACTION_FUNCTION(AActor, A_FreezeDeathChunks)
 	}
 	if (self->player)
 	{ // attach the player's view to a chunk of ice
-		AActor *head = Spawn("IceChunkHead", self->x, self->y, 
-													self->z + self->player->mo->ViewHeight, ALLOW_REPLACE);
+		AActor *head = Spawn("IceChunkHead", self->PosPlusZ(self->player->mo->ViewHeight), ALLOW_REPLACE);
 		if (head != NULL)
 		{
-			head->velz = FixedDiv(head->z - self->z, self->height)<<2;
+			head->velz = FixedDiv(head->Z() - self->Z(), self->height)<<2;
 			head->velx = pr_freeze.Random2 () << (FRACBITS-7);
 			head->vely = pr_freeze.Random2 () << (FRACBITS-7);
 			head->health = self->health;

src/g_shared/a_artifacts.cpp

@@ -965,7 +965,7 @@ void APowerFlight::InitEffect ()
 	Super::InitEffect();
 	Owner->flags2 |= MF2_FLY;
 	Owner->flags |= MF_NOGRAVITY;
-	if (Owner->z <= Owner->floorz)
+	if (Owner->Z() <= Owner->floorz)
 	{
 		Owner->velz = 4*FRACUNIT;	// thrust the player in the air a bit
 	}
@@ -1012,7 +1012,7 @@ void APowerFlight::EndEffect ()
 
 	if (!(Owner->flags7 & MF7_FLYCHEAT))
 	{
-		if (Owner->z != Owner->floorz)
+		if (Owner->Z() != Owner->floorz)
 		{
 			Owner->player->centering = true;
 		}
@@ -1250,7 +1250,7 @@ void APowerSpeed::DoEffect ()
 	if (P_AproxDistance (Owner->velx, Owner->vely) <= 12*FRACUNIT)
 		return;
 
-	AActor *speedMo = Spawn<APlayerSpeedTrail> (Owner->x, Owner->y, Owner->z, NO_REPLACE);
+	AActor *speedMo = Spawn<APlayerSpeedTrail> (Owner->Pos(), NO_REPLACE);
 	if (speedMo)
 	{
 		speedMo->angle = Owner->angle;

src/g_shared/a_bridge.cpp

@@ -112,9 +112,9 @@ DEFINE_ACTION_FUNCTION(AActor, A_BridgeOrbit)
 	if (self->target->args[4]) rotationradius = ((self->target->args[4] * self->target->radius) / (100 * FRACUNIT));
 
 	self->angle += rotationspeed;
-	self->x = self->target->x + rotationradius * finecosine[self->angle >> ANGLETOFINESHIFT];
-	self->y = self->target->y + rotationradius * finesine[self->angle >> ANGLETOFINESHIFT];
-	self->z = self->target->z;
+	self->SetOrigin(self->target->Vec3Angle(rotationradius, self->angle, 0), true);
+	self->floorz = self->target->floorz;
+	self->ceilingz = self->target->ceilingz;
 	return 0;
 }
 
@@ -126,16 +126,12 @@ DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_BridgeInit)
 
 	angle_t startangle;
 	AActor *ball;
-	fixed_t cx, cy, cz;
 
 	if (balltype == NULL)
 	{
 		balltype = PClass::FindActor("BridgeBall");
 	}
 
-	cx = self->x;
-	cy = self->y;
-	cz = self->z;
 	startangle = pr_orbit() << 24;
 
 	// Spawn triad into world -- may be more than a triad now.
@@ -143,7 +139,7 @@ DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_BridgeInit)
 
 	for (int i = 0; i < ballcount; i++)
 	{
-		ball = Spawn(balltype, cx, cy, cz, ALLOW_REPLACE);
+		ball = Spawn(balltype, self->Pos(), ALLOW_REPLACE);
 		ball->angle = startangle + (ANGLE_45/32) * (256/ballcount) * i;
 		ball->target = self;
 		CALL_ACTION(A_BridgeOrbit, ball);

src/g_shared/a_camera.cpp

@@ -176,11 +176,10 @@ void AAimingCamera::Tick ()
 		}
 		if (MaxPitchChange)
 		{ // Aim camera's pitch; use floats for precision
-			float dx = FIXED2FLOAT(x - tracer->x);
-			float dy = FIXED2FLOAT(y - tracer->y);
-			float dz = FIXED2FLOAT(z - tracer->z - tracer->height/2);
-			float dist = (float)sqrt (dx*dx + dy*dy);
-			float ang = dist != 0.f ? (float)atan2 (dz, dist) : 0;
+			TVector2<double> vect = tracer->Vec2To(this);
+			double dz = FIXED2DBL(Z() - tracer->Z() - tracer->height/2);
+			double dist = vect.Length();
+			double ang = dist != 0.f ? atan2 (dz, dist) : 0;
 			int desiredpitch = (angle_t)(ang * 2147483648.f / PI);
 			if (abs (desiredpitch - pitch) < MaxPitchChange)
 			{

src/g_shared/a_debris.cpp

@@ -36,17 +36,14 @@ void P_SpawnDirt (AActor *actor, fixed_t radius)
 	AActor *mo;
 	angle_t angle;
 
-	angle = pr_dirt()<<5;		// <<24 >>19
-	x = actor->x + FixedMul(radius,finecosine[angle]);
-	y = actor->y + FixedMul(radius,finesine[angle]);
-	z = actor->z + (pr_dirt()<<9) + FRACUNIT;
+	fixedvec3 pos = actor->Vec3Angle(radius, pr_dirt() << 24, (pr_dirt() << 9) + FRACUNIT);
 
 	char fmt[8];
 	mysnprintf(fmt, countof(fmt), "Dirt%d", 1 + pr_dirt()%6);
 	dtype = PClass::FindActor(fmt);
 	if (dtype)
 	{
-		mo = Spawn (dtype, x, y, z, ALLOW_REPLACE);
+		mo = Spawn (dtype, pos, ALLOW_REPLACE);
 		if (mo)
 		{
 			mo->velz = pr_dirt()<<10;

src/g_shared/a_decals.cpp

@@ -91,7 +91,7 @@ DBaseDecal::DBaseDecal (int statnum, fixed_t z)
 
 DBaseDecal::DBaseDecal (const AActor *basis)
 : DThinker(STAT_DECAL),
-  WallNext(0), WallPrev(0), LeftDistance(0), Z(basis->z), ScaleX(basis->scaleX), ScaleY(basis->scaleY),
+  WallNext(0), WallPrev(0), LeftDistance(0), Z(basis->Z()), ScaleX(basis->scaleX), ScaleY(basis->scaleY),
   Alpha(basis->alpha), AlphaColor(basis->fillcolor), Translation(basis->Translation), PicNum(basis->picnum),
   RenderFlags(basis->renderflags), RenderStyle(basis->RenderStyle)
 {
@@ -817,22 +817,22 @@ void ADecal::BeginPlay ()
 	{
 		if (!tpl->PicNum.Exists())
 		{
-			Printf("Decal actor at (%d,%d) does not have a valid texture\n", x>>FRACBITS, y>>FRACBITS);
+			Printf("Decal actor at (%d,%d) does not have a valid texture\n", X()>>FRACBITS, Y()>>FRACBITS);
 		}
 		else
 		{
 			// Look for a wall within 64 units behind the actor. If none can be
 			// found, then no decal is created, and this actor is destroyed
 			// without effectively doing anything.
-			if (NULL == ShootDecal(tpl, this, Sector, x, y, z, angle + ANGLE_180, 64*FRACUNIT, true))
+			if (NULL == ShootDecal(tpl, this, Sector, X(), Y(), Z(), angle + ANGLE_180, 64*FRACUNIT, true))
 			{
-				DPrintf ("Could not find a wall to stick decal to at (%d,%d)\n", x>>FRACBITS, y>>FRACBITS);
+				DPrintf ("Could not find a wall to stick decal to at (%d,%d)\n", X()>>FRACBITS, Y()>>FRACBITS);
 			}
 		}
 	}
 	else
 	{
-		DPrintf ("Decal actor at (%d,%d) does not have a good template\n", x>>FRACBITS, y>>FRACBITS);
+		DPrintf ("Decal actor at (%d,%d) does not have a good template\n", X()>>FRACBITS, Y()>>FRACBITS);
 	}
 	// This actor doesn't need to stick around anymore.
 	Destroy();

src/g_shared/a_fastprojectile.cpp

@@ -25,10 +25,10 @@ void AFastProjectile::Tick ()
 	fixed_t zfrac;
 	int changexy;
 
-	PrevX = x;
-	PrevY = y;
-	PrevZ = z;
-	fixed_t oldz = z;
+	PrevX = X();
+	PrevY = Y();
+	PrevZ = Z();
+	fixed_t oldz = Z();
 	PrevAngle = angle;
 
 	if (!(flags5 & MF5_NOTIMEFREEZE))
@@ -57,7 +57,7 @@ void AFastProjectile::Tick ()
 	}
 
 	// Handle movement
-	if (velx || vely || (z != floorz) || velz)
+	if (velx || vely || (Z() != floorz) || velz)
 	{
 		xfrac = velx >> shift;
 		yfrac = vely >> shift;
@@ -73,14 +73,14 @@ void AFastProjectile::Tick ()
 					tm.LastRipped = NULL;	// [RH] Do rip damage each step, like Hexen
 				}
 				
-				if (!P_TryMove (this, x + xfrac,y + yfrac, true, NULL, tm))
+				if (!P_TryMove (this, X() + xfrac,Y() + yfrac, true, NULL, tm))
 				{ // Blocked move
 					if (!(flags3 & MF3_SKYEXPLODE))
 					{
 						if (tm.ceilingline &&
 							tm.ceilingline->backsector &&
 							tm.ceilingline->backsector->GetTexture(sector_t::ceiling) == skyflatnum &&
-							z >= tm.ceilingline->backsector->ceilingplane.ZatPoint (x, y))
+							Z() >= tm.ceilingline->backsector->ceilingplane.ZatPoint (this))
 						{
 							// Hack to prevent missiles exploding against the sky.
 							// Does not handle sky floors.
@@ -99,10 +99,10 @@ void AFastProjectile::Tick ()
 					return;
 				}
 			}
-			z += zfrac;
+			AddZ(zfrac);
 			UpdateWaterLevel (oldz);
-			oldz = z;
-			if (z <= floorz)
+			oldz = Z();
+			if (Z() <= floorz)
 			{ // Hit the floor
 
 				if (floorpic == skyflatnum && !(flags3 & MF3_SKYEXPLODE))
@@ -113,12 +113,12 @@ void AFastProjectile::Tick ()
 					return;
 				}
 
-				z = floorz;
+				SetZ(floorz);
 				P_HitFloor (this);
 				P_ExplodeMissile (this, NULL, NULL);
 				return;
 			}
-			if (z + height > ceilingz)
+			if (Top() > ceilingz)
 			{ // Hit the ceiling
 
 				if (ceilingpic == skyflatnum &&  !(flags3 & MF3_SKYEXPLODE))
@@ -127,7 +127,7 @@ void AFastProjectile::Tick ()
 					return;
 				}
 
-				z = ceilingz - height;
+				SetZ(ceilingz - height);
 				P_ExplodeMissile (this, NULL, NULL);
 				return;
 			}
@@ -160,7 +160,7 @@ void AFastProjectile::Effect()
 		FName name = GetClass()->MissileName;
 		if (name != NAME_None)
 		{
-			fixed_t hitz = z-8*FRACUNIT;
+			fixed_t hitz = Z()-8*FRACUNIT;
 
 			if (hitz < floorz)
 			{
@@ -172,7 +172,7 @@ void AFastProjectile::Effect()
 			PClassActor *trail = PClass::FindActor(name);
 			if (trail != NULL)
 			{
-				AActor *act = Spawn (trail, x, y, hitz, ALLOW_REPLACE);
+				AActor *act = Spawn (trail, X(), Y(), hitz, ALLOW_REPLACE);
 				if (act != NULL)
 				{
 					act->angle = this->angle;

src/g_shared/a_morph.cpp

@@ -77,7 +77,7 @@ bool P_MorphPlayer (player_t *activator, player_t *p, PClassPlayerPawn *spawntyp
 		return false;
 	}
 
-	morphed = static_cast<APlayerPawn *>(Spawn (spawntype, actor->x, actor->y, actor->z, NO_REPLACE));
+	morphed = static_cast<APlayerPawn *>(Spawn (spawntype, actor->Pos(), NO_REPLACE));
 	EndAllPowerupEffects(actor->Inventory);
 	DObject::StaticPointerSubstitution (actor, morphed);
 	if ((actor->tid != 0) && (style & MORPH_NEWTIDBEHAVIOUR))
@@ -105,7 +105,7 @@ bool P_MorphPlayer (player_t *activator, player_t *p, PClassPlayerPawn *spawntyp
 	morphed->flags  |= actor->flags & (MF_SHADOW|MF_NOGRAVITY);
 	morphed->flags2 |= actor->flags2 & MF2_FLY;
 	morphed->flags3 |= actor->flags3 & MF3_GHOST;
-	AActor *eflash = Spawn(((enter_flash) ? enter_flash : RUNTIME_CLASS(ATeleportFog)), actor->x, actor->y, actor->z + TELEFOGHEIGHT, ALLOW_REPLACE);
+	AActor *eflash = Spawn(((enter_flash) ? enter_flash : RUNTIME_CLASS(ATeleportFog)), actor->PosPlusZ(TELEFOGHEIGHT), ALLOW_REPLACE);
 	actor->player = NULL;
 	actor->flags &= ~(MF_SOLID|MF_SHOOTABLE);
 	actor->flags |= MF_UNMORPHED;
@@ -192,7 +192,7 @@ bool P_UndoPlayerMorph (player_t *activator, player_t *player, int unmorphflag,
 	}
 
 	mo = barrier_cast<APlayerPawn *>(pmo->tracer);
-	mo->SetOrigin (pmo->x, pmo->y, pmo->z);
+	mo->SetOrigin (pmo->Pos(), false);
 	mo->flags |= MF_SOLID;
 	pmo->flags &= ~MF_SOLID;
 	if (!force && !P_TestMobjLocation (mo))
@@ -310,7 +310,7 @@ bool P_UndoPlayerMorph (player_t *activator, player_t *player, int unmorphflag,
 	AActor *eflash = NULL;
 	if (exit_flash != NULL)
 	{
-		eflash = Spawn(exit_flash, pmo->x + 20*finecosine[angle], pmo->y + 20*finesine[angle], pmo->z + TELEFOGHEIGHT, ALLOW_REPLACE);
+		eflash = Spawn(exit_flash, pmo->Vec3Offset(20*finecosine[angle], 20*finesine[angle], TELEFOGHEIGHT), ALLOW_REPLACE);
 		if (eflash)	eflash->target = mo;
 	}
 	mo->SetupWeaponSlots();		// Use original class's weapon slots.
@@ -381,7 +381,7 @@ bool P_MorphMonster (AActor *actor, PClassActor *spawntype, int duration, int st
 		return false;
 	}
 
-	morphed = static_cast<AMorphedMonster *>(Spawn (spawntype, actor->x, actor->y, actor->z, NO_REPLACE));
+	morphed = static_cast<AMorphedMonster *>(Spawn (spawntype, actor->Pos(), NO_REPLACE));
 	DObject::StaticPointerSubstitution (actor, morphed);
 	morphed->tid = actor->tid;
 	morphed->angle = actor->angle;
@@ -410,7 +410,7 @@ bool P_MorphMonster (AActor *actor, PClassActor *spawntype, int duration, int st
 	actor->flags &= ~(MF_SOLID|MF_SHOOTABLE);
 	actor->flags |= MF_UNMORPHED;
 	actor->renderflags |= RF_INVISIBLE;
-	AActor *eflash = Spawn(((enter_flash) ? enter_flash : RUNTIME_CLASS(ATeleportFog)), actor->x, actor->y, actor->z + TELEFOGHEIGHT, ALLOW_REPLACE);
+	AActor *eflash = Spawn(((enter_flash) ? enter_flash : RUNTIME_CLASS(ATeleportFog)), actor->PosPlusZ(TELEFOGHEIGHT), ALLOW_REPLACE);
 	if (eflash)
 		eflash->target = morphed;
 	return true;
@@ -436,7 +436,7 @@ bool P_UndoMonsterMorph (AMorphedMonster *beast, bool force)
 		return false;
 	}
 	actor = beast->UnmorphedMe;
-	actor->SetOrigin (beast->x, beast->y, beast->z);
+	actor->SetOrigin (beast->Pos(), false);
 	actor->flags |= MF_SOLID;
 	beast->flags &= ~MF_SOLID;
 	ActorFlags6 beastflags6 = beast->flags6;
@@ -472,7 +472,7 @@ bool P_UndoMonsterMorph (AMorphedMonster *beast, bool force)
 	DObject::StaticPointerSubstitution (beast, actor);
 	PClassActor *exit_flash = beast->MorphExitFlash;
 	beast->Destroy ();
-	AActor *eflash = Spawn(exit_flash, beast->x, beast->y, beast->z + TELEFOGHEIGHT, ALLOW_REPLACE);
+	AActor *eflash = Spawn(exit_flash, beast->PosPlusZ(TELEFOGHEIGHT), ALLOW_REPLACE);
 	if (eflash)
 		eflash->target = actor;
 	return true;

src/g_shared/a_movingcamera.cpp

@@ -282,7 +282,7 @@ void APathFollower::Activate (AActor *activator)
 		if (CurrNode != NULL)
 		{
 			NewNode ();
-			SetOrigin (CurrNode->x, CurrNode->y, CurrNode->z);
+			SetOrigin (CurrNode->Pos(), false);
 			Time = 0.f;
 			HoldTime = 0;
 			bJustStepped = true;
@@ -302,9 +302,7 @@ void APathFollower::Tick ()
 		if (CurrNode->args[2])
 		{
 			HoldTime = level.time + CurrNode->args[2] * TICRATE / 8;
-			x = CurrNode->x;
-			y = CurrNode->y;
-			z = CurrNode->z;
+			SetXYZ(CurrNode->X(), CurrNode->Y(), CurrNode->Z());
 		}
 	}
 
@@ -362,31 +360,33 @@ bool APathFollower::Interpolate ()
 
 	if ((args[2] & 8) && Time > 0.f)
 	{
-		dx = x;
-		dy = y;
-		dz = z;
+		dx = X();
+		dy = Y();
+		dz = Z();
 	}
 
 	if (CurrNode->Next==NULL) return false;
 
 	UnlinkFromWorld ();
+	fixed_t x, y, z;
 	if (args[2] & 1)
 	{	// linear
-		x = FLOAT2FIXED(Lerp (FIXED2FLOAT(CurrNode->x), FIXED2FLOAT(CurrNode->Next->x)));
-		y = FLOAT2FIXED(Lerp (FIXED2FLOAT(CurrNode->y), FIXED2FLOAT(CurrNode->Next->y)));
-		z = FLOAT2FIXED(Lerp (FIXED2FLOAT(CurrNode->z), FIXED2FLOAT(CurrNode->Next->z)));
+		x = FLOAT2FIXED(Lerp (FIXED2FLOAT(CurrNode->X()), FIXED2FLOAT(CurrNode->Next->X())));
+		y = FLOAT2FIXED(Lerp (FIXED2FLOAT(CurrNode->Y()), FIXED2FLOAT(CurrNode->Next->Y())));
+		z = FLOAT2FIXED(Lerp (FIXED2FLOAT(CurrNode->Z()), FIXED2FLOAT(CurrNode->Next->Z())));
 	}
 	else
 	{	// spline
 		if (CurrNode->Next->Next==NULL) return false;
 
-		x = FLOAT2FIXED(Splerp (FIXED2FLOAT(PrevNode->x), FIXED2FLOAT(CurrNode->x),
-								FIXED2FLOAT(CurrNode->Next->x), FIXED2FLOAT(CurrNode->Next->Next->x)));
-		y = FLOAT2FIXED(Splerp (FIXED2FLOAT(PrevNode->y), FIXED2FLOAT(CurrNode->y),
-								FIXED2FLOAT(CurrNode->Next->y), FIXED2FLOAT(CurrNode->Next->Next->y)));
-		z = FLOAT2FIXED(Splerp (FIXED2FLOAT(PrevNode->z), FIXED2FLOAT(CurrNode->z),
-								FIXED2FLOAT(CurrNode->Next->z), FIXED2FLOAT(CurrNode->Next->Next->z)));
+		x = FLOAT2FIXED(Splerp (FIXED2FLOAT(PrevNode->X()), FIXED2FLOAT(CurrNode->X()),
+								FIXED2FLOAT(CurrNode->Next->X()), FIXED2FLOAT(CurrNode->Next->Next->X())));
+		y = FLOAT2FIXED(Splerp (FIXED2FLOAT(PrevNode->Y()), FIXED2FLOAT(CurrNode->Y()),
+								FIXED2FLOAT(CurrNode->Next->Y()), FIXED2FLOAT(CurrNode->Next->Next->Y())));
+		z = FLOAT2FIXED(Splerp (FIXED2FLOAT(PrevNode->Z()), FIXED2FLOAT(CurrNode->Z()),
+								FIXED2FLOAT(CurrNode->Next->Z()), FIXED2FLOAT(CurrNode->Next->Next->Z())));
 	}
+	SetXYZ(x, y, z);
 	LinkToWorld ();
 
 	if (args[2] & 6)
@@ -395,9 +395,9 @@ bool APathFollower::Interpolate ()
 		{
 			if (args[2] & 1)
 			{ // linear
-				dx = CurrNode->Next->x - CurrNode->x;
-				dy = CurrNode->Next->y - CurrNode->y;
-				dz = CurrNode->Next->z - CurrNode->z;
+				dx = CurrNode->Next->X() - CurrNode->X();
+				dy = CurrNode->Next->Y() - CurrNode->Y();
+				dz = CurrNode->Next->Z() - CurrNode->Z();
 			}
 			else if (Time > 0.f)
 			{ // spline
@@ -422,6 +422,7 @@ bool APathFollower::Interpolate ()
 				x -= dx;
 				y -= dy;
 				z -= dz;
+				SetXYZ(x, y, z);
 			}
 			if (args[2] & 2)
 			{ // adjust yaw
@@ -548,11 +549,11 @@ bool AActorMover::Interpolate ()
 
 	if (Super::Interpolate ())
 	{
-		fixed_t savedz = tracer->z;
-		tracer->z = z;
-		if (!P_TryMove (tracer, x, y, true))
+		fixed_t savedz = tracer->Z();
+		tracer->SetZ(Z());
+		if (!P_TryMove (tracer, X(), Y(), true))
 		{
-			tracer->z = savedz;
+			tracer->SetZ(savedz);
 			return false;
 		}
 
@@ -589,9 +590,9 @@ void AActorMover::Activate (AActor *activator)
 	// Don't let the renderer interpolate between the actor's
 	// old position and its new position.
 	Interpolate ();
-	tracer->PrevX = tracer->x;
-	tracer->PrevY = tracer->y;
-	tracer->PrevZ = tracer->z;
+	tracer->PrevX = tracer->X();
+	tracer->PrevY = tracer->Y();
+	tracer->PrevZ = tracer->Z();
 	tracer->PrevAngle = tracer->angle;
 }
 
@@ -667,15 +668,15 @@ bool AMovingCamera::Interpolate ()
 
 	if (Super::Interpolate ())
 	{
-		angle = R_PointToAngle2 (x, y, tracer->x, tracer->y);
+		angle = AngleTo(tracer, true);
 
 		if (args[2] & 4)
 		{ // Also aim camera's pitch; use floats for precision
-			float dx = FIXED2FLOAT(x - tracer->x);
-			float dy = FIXED2FLOAT(y - tracer->y);
-			float dz = FIXED2FLOAT(z - tracer->z - tracer->height/2);
-			float dist = (float)sqrt (dx*dx + dy*dy);
-			float ang = dist != 0.f ? (float)atan2 (dz, dist) : 0;
+			double dx = FIXED2DBL(X() - tracer->X());
+			double dy = FIXED2DBL(Y() - tracer->Y());
+			double dz = FIXED2DBL(Z() - tracer->Z() - tracer->height/2);
+			double dist = sqrt (dx*dx + dy*dy);
+			double ang = dist != 0.f ? atan2 (dz, dist) : 0;
 			pitch = (angle_t)(ang * 2147483648.f / PI);
 		}
 

src/g_shared/a_pickups.cpp

@@ -373,7 +373,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_RestoreSpecialDoomThing)
 	{
 		self->SetState (self->SpawnState);
 		S_Sound (self, CHAN_VOICE, "misc/spawn", 1, ATTN_IDLE);
-		Spawn ("ItemFog", self->x, self->y, self->z, ALLOW_REPLACE);
+		Spawn ("ItemFog", self->Pos(), ALLOW_REPLACE);
 	}
 	return 0;
 }
@@ -396,19 +396,18 @@ DEFINE_ACTION_FUNCTION(AActor, A_RestoreSpecialPosition)
 	_y = self->SpawnPoint[1];
 
 	self->UnlinkFromWorld();
-	self->x = _x;
-	self->y = _y;
+	self->SetXY(_x, _y);
 	self->LinkToWorld(true);
 	sec = self->Sector;
-	self->z =
 	self->dropoffz =
 	self->floorz = sec->floorplane.ZatPoint(_x, _y);
 	self->ceilingz = sec->ceilingplane.ZatPoint(_x, _y);
+	self->SetZ(self->floorz);
 	P_FindFloorCeiling(self, FFCF_ONLYSPAWNPOS);
 
 	if (self->flags & MF_SPAWNCEILING)
 	{
-		self->z = self->ceilingz - self->height - self->SpawnPoint[2];
+		self->SetZ(self->ceilingz - self->height - self->SpawnPoint[2]);
 	}
 	else if (self->flags2 & MF2_SPAWNFLOAT)
 	{
@@ -416,33 +415,33 @@ DEFINE_ACTION_FUNCTION(AActor, A_RestoreSpecialPosition)
 		if (space > 48*FRACUNIT)
 		{
 			space -= 40*FRACUNIT;
-			self->z = ((space * pr_restore())>>8) + self->floorz + 40*FRACUNIT;
+			self->SetZ(((space * pr_restore())>>8) + self->floorz + 40*FRACUNIT);
 		}
 		else
 		{
-			self->z = self->floorz;
+			self->SetZ(self->floorz);
 		}
 	}
 	else
 	{
-		self->z = self->SpawnPoint[2] + self->floorz;
+		self->SetZ(self->SpawnPoint[2] + self->floorz);
 	}
 	// Redo floor/ceiling check, in case of 3D floors
 	P_FindFloorCeiling(self, FFCF_SAMESECTOR | FFCF_ONLY3DFLOORS | FFCF_3DRESTRICT);
-	if (self->z < self->floorz)
+	if (self->Z() < self->floorz)
 	{ // Do not reappear under the floor, even if that's where we were for the
 	  // initial spawn.
-		self->z = self->floorz;
+		self->SetZ(self->floorz);
 	}
-	if ((self->flags & MF_SOLID) && (self->z + self->height > self->ceilingz))
+	if ((self->flags & MF_SOLID) && (self->Top() > self->ceilingz))
 	{ // Do the same for the ceiling.
-		self->z = self->ceilingz - self->height;
+		self->SetZ(self->ceilingz - self->height);
 	}
 	// Do not interpolate from the position the actor was at when it was
 	// picked up, in case that is different from where it is now.
-	self->PrevX = self->x;
-	self->PrevY = self->y;
-	self->PrevZ = self->z;
+	self->PrevX = self->X();
+	self->PrevY = self->Y();
+	self->PrevZ = self->Z();
 	return 0;
 }
 
@@ -774,8 +773,7 @@ AInventory *AInventory::CreateTossable ()
 		flags &= ~(MF_SPECIAL|MF_SOLID);
 		return this;
 	}
-	copy = static_cast<AInventory *>(Spawn (GetClass(), Owner->x,
-		Owner->y, Owner->z, NO_REPLACE));
+	copy = static_cast<AInventory *>(Spawn (GetClass(), Owner->Pos(), NO_REPLACE));
 	if (copy != NULL)
 	{
 		copy->MaxAmount = MaxAmount;
@@ -1040,7 +1038,7 @@ void AInventory::Touch (AActor *toucher)
 	// This is the only situation when a pickup flash should ever play.
 	if (PickupFlash != NULL && !ShouldStay())
 	{
-		Spawn(PickupFlash, x, y, z, ALLOW_REPLACE);
+		Spawn(PickupFlash, Pos(), ALLOW_REPLACE);
 	}
 
 	if (!(ItemFlags & IF_QUIET))
@@ -1336,8 +1334,8 @@ bool AInventory::DoRespawn ()
 		if (state != NULL) spot = state->GetRandomSpot(SpawnPointClass);
 		if (spot != NULL) 
 		{
-			SetOrigin (spot->x, spot->y, spot->z);
-			z = floorz;
+			SetOrigin (spot->Pos(), false);
+			SetZ(floorz);
 		}
 	}
 	return true;

src/g_shared/a_quake.cpp

@@ -131,7 +131,7 @@ void DEarthquake::Tick ()
 
 				dist = m_Spot->AproxDistance (victim, true);
 				// Check if in damage radius
-				if (dist < m_DamageRadius && victim->z <= victim->floorz)
+				if (dist < m_DamageRadius && victim->Z() <= victim->floorz)
 				{
 					if (pr_quake() < 50)
 					{

src/g_shared/a_randomspawner.cpp

@@ -91,7 +91,7 @@ class ARandomSpawner : public AActor
 			// So now we can spawn the dropped item.
 			if (di == NULL || bouncecount >= MAX_RANDOMSPAWNERS_RECURSION)	// Prevents infinite recursions
 			{
-				Spawn("Unknown", x, y, z, NO_REPLACE);		// Show that there's a problem.
+				Spawn("Unknown", Pos(), NO_REPLACE);		// Show that there's a problem.
 				Destroy();
 				return;
 			}
@@ -149,11 +149,11 @@ class ARandomSpawner : public AActor
 			{
 				tracer = target->target;
 			}
-			newmobj = P_SpawnMissileXYZ(x, y, z, target, target->target, cls, false);
+			newmobj = P_SpawnMissileXYZ(Pos(), target, target->target, cls, false);
 		}
 		else 
 		{		
-			newmobj = Spawn(cls, x, y, z, NO_REPLACE);
+			newmobj = Spawn(cls, Pos(), NO_REPLACE);
 		}
 		if (newmobj != NULL)
 		{
@@ -187,7 +187,7 @@ class ARandomSpawner : public AActor
 			// Handle special altitude flags
 			if (newmobj->flags & MF_SPAWNCEILING)
 			{
-				newmobj->z = newmobj->ceilingz - newmobj->height - SpawnPoint[2];
+				newmobj->SetZ(newmobj->ceilingz - newmobj->height - SpawnPoint[2]);
 			}
 			else if (newmobj->flags2 & MF2_SPAWNFLOAT) 
 			{
@@ -195,9 +195,9 @@ class ARandomSpawner : public AActor
 				if (space > 48*FRACUNIT)
 				{
 					space -= 40*FRACUNIT;
-					newmobj->z = MulScale8 (space, pr_randomspawn()) + newmobj->floorz + 40*FRACUNIT;
+					newmobj->SetZ(MulScale8 (space, pr_randomspawn()) + newmobj->floorz + 40*FRACUNIT);
 				}
-				newmobj->z += SpawnPoint[2];
+				newmobj->AddZ(SpawnPoint[2]);
 			}
 			if (newmobj->flags & MF_MISSILE)
 				P_CheckMissileSpawn(newmobj, 0);

src/g_shared/a_spark.cpp

@@ -50,6 +50,6 @@ IMPLEMENT_CLASS (ASpark)
 void ASpark::Activate (AActor *activator)
 {
 	Super::Activate (activator);
-	P_DrawSplash (args[0] ? args[0] : 32, x, y, z, angle, 1);
+	P_DrawSplash (args[0] ? args[0] : 32, X(), Y(), Z(), angle, 1);
 	S_Sound (this, CHAN_AUTO, "world/spark", 1, ATTN_STATIC);
 }

src/g_shared/a_specialspot.cpp

@@ -423,12 +423,12 @@ DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_SpawnSingleItem)
 		return 0;
 	}
 
-	AActor *spawned = Spawn(cls, self->x, self->y, self->z, ALLOW_REPLACE);
+	AActor *spawned = Spawn(cls, self->Pos(), ALLOW_REPLACE);
 
 	if (spawned)
 	{
-		spawned->SetOrigin (spot->x, spot->y, spot->z);
-		spawned->z = spawned->floorz;
+		spawned->SetOrigin (spot->Pos(), false);
+		spawned->SetZ(spawned->floorz);
 		// We want this to respawn.
 		if (!(self->flags & MF_DROPPED)) 
 		{

src/g_shared/shared_hud.cpp

@@ -825,9 +825,9 @@ static void DrawCoordinates(player_t * CPlayer)
 	
 	if (!map_point_coordinates || !automapactive) 
 	{
-		x=CPlayer->mo->x;
-		y=CPlayer->mo->y;                     
-		z=CPlayer->mo->z;
+		x=CPlayer->mo->X();
+		y=CPlayer->mo->Y();                     
+		z=CPlayer->mo->Z();
 	}
 	else 
 	{

src/g_shared/shared_sbar.cpp

@@ -1286,8 +1286,8 @@ void DBaseStatusBar::Draw (EHudState state)
 				y -= height * 2;
 		}
 
-		value = &CPlayer->mo->z;
-		for (i = 2, value = &CPlayer->mo->z; i >= 0; y -= height, --value, --i)
+		fixedvec3 pos = CPlayer->mo->Pos();
+		for (i = 2, value = &pos.z; i >= 0; y -= height, --value, --i)
 		{
 			mysnprintf (line, countof(line), "%c: %d", labels[i], *value >> FRACBITS);
 			screen->DrawText (SmallFont, CR_GREEN, xpos, y, line, 

src/g_strife/a_alienspectres.cpp

@@ -22,7 +22,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_SpectreChunkSmall)
 {
 	PARAM_ACTION_PROLOGUE;
 
-	AActor *foo = Spawn("AlienChunkSmall", self->x, self->y, self->z + 10*FRACUNIT, ALLOW_REPLACE);
+	AActor *foo = Spawn("AlienChunkSmall", self->PosPlusZ(10*FRACUNIT), ALLOW_REPLACE);
 
 	if (foo != NULL)
 	{
@@ -43,7 +43,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_SpectreChunkLarge)
 {
 	PARAM_ACTION_PROLOGUE;
 
-	AActor *foo = Spawn("AlienChunkLarge", self->x, self->y, self->z + 10*FRACUNIT, ALLOW_REPLACE);
+	AActor *foo = Spawn("AlienChunkLarge", self->PosPlusZ(10*FRACUNIT), ALLOW_REPLACE);
 
 	if (foo != NULL)
 	{
@@ -67,7 +67,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_Spectre3Attack)
 	if (self->target == NULL)
 		return 0;
 
-	AActor *foo = Spawn("SpectralLightningV2", self->x, self->y, self->z + 32*FRACUNIT, ALLOW_REPLACE);
+	AActor *foo = Spawn("SpectralLightningV2", self->PosPlusZ(32*FRACUNIT), ALLOW_REPLACE);
 
 	foo->velz = -12*FRACUNIT;
 	foo->target = self;

src/g_strife/a_coin.cpp

@@ -80,22 +80,22 @@ AInventory *ACoin::CreateTossable ()
 	if (Amount >= 50)
 	{
 		Amount -= 50;
-		tossed = static_cast<ACoin*>(Spawn("Gold50", Owner->x, Owner->y, Owner->z, NO_REPLACE));
+		tossed = static_cast<ACoin*>(Spawn("Gold50", Owner->Pos(), NO_REPLACE));
 	}
 	else if (Amount >= 25)
 	{
 		Amount -= 25;
-		tossed = static_cast<ACoin*>(Spawn("Gold25", Owner->x, Owner->y, Owner->z, NO_REPLACE));
+		tossed = static_cast<ACoin*>(Spawn("Gold25", Owner->Pos(), NO_REPLACE));
 	}
 	else if (Amount >= 10)
 	{
 		Amount -= 10;
-		tossed = static_cast<ACoin*>(Spawn("Gold10", Owner->x, Owner->y, Owner->z, NO_REPLACE));
+		tossed = static_cast<ACoin*>(Spawn("Gold10", Owner->Pos(), NO_REPLACE));
 	}
 	else if (Amount > 1 || (ItemFlags & IF_KEEPDEPLETED))
 	{
 		Amount -= 1;
-		tossed = static_cast<ACoin*>(Spawn("Coin", Owner->x, Owner->y, Owner->z, NO_REPLACE));
+		tossed = static_cast<ACoin*>(Spawn("Coin", Owner->Pos(), NO_REPLACE));
 	}
 	else // Amount == 1 && !(ItemFlags & IF_KEEPDEPLETED)
 	{

src/g_strife/a_crusader.cpp

@@ -29,18 +29,18 @@ DEFINE_ACTION_FUNCTION(AActor, A_CrusaderChoose)
 	{
 		A_FaceTarget (self);
 		self->angle -= ANGLE_180/16;
-		P_SpawnMissileZAimed (self, self->z + 40*FRACUNIT, self->target, PClass::FindActor("FastFlameMissile"));
+		P_SpawnMissileZAimed (self, self->Z() + 40*FRACUNIT, self->target, PClass::FindActor("FastFlameMissile"));
 	}
 	else
 	{
 		if (P_CheckMissileRange (self))
 		{
 			A_FaceTarget (self);
-			P_SpawnMissileZAimed (self, self->z + 56*FRACUNIT, self->target, PClass::FindActor("CrusaderMissile"));
+			P_SpawnMissileZAimed (self, self->Z() + 56*FRACUNIT, self->target, PClass::FindActor("CrusaderMissile"));
 			self->angle -= ANGLE_45/32;
-			P_SpawnMissileZAimed (self, self->z + 40*FRACUNIT, self->target, PClass::FindActor("CrusaderMissile"));
+			P_SpawnMissileZAimed (self, self->Z() + 40*FRACUNIT, self->target, PClass::FindActor("CrusaderMissile"));
 			self->angle += ANGLE_45/16;
-			P_SpawnMissileZAimed (self, self->z + 40*FRACUNIT, self->target, PClass::FindActor("CrusaderMissile"));
+			P_SpawnMissileZAimed (self, self->Z() + 40*FRACUNIT, self->target, PClass::FindActor("CrusaderMissile"));
 			self->angle -= ANGLE_45/16;
 			self->reactiontime += 15;
 		}
@@ -54,7 +54,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_CrusaderSweepLeft)
 	PARAM_ACTION_PROLOGUE;
 
 	self->angle += ANGLE_90/16;
-	AActor *misl = P_SpawnMissileZAimed (self, self->z + 48*FRACUNIT, self->target, PClass::FindActor("FastFlameMissile"));
+	AActor *misl = P_SpawnMissileZAimed (self, self->Z() + 48*FRACUNIT, self->target, PClass::FindActor("FastFlameMissile"));
 	if (misl != NULL)
 	{
 		misl->velz += FRACUNIT;
@@ -67,7 +67,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_CrusaderSweepRight)
 	PARAM_ACTION_PROLOGUE;
 
 	self->angle -= ANGLE_90/16;
-	AActor *misl = P_SpawnMissileZAimed (self, self->z + 48*FRACUNIT, self->target, PClass::FindActor("FastFlameMissile"));
+	AActor *misl = P_SpawnMissileZAimed (self, self->Z() + 48*FRACUNIT, self->target, PClass::FindActor("FastFlameMissile"));
 	if (misl != NULL)
 	{
 		misl->velz += FRACUNIT;

src/g_strife/a_entityboss.cpp

@@ -27,7 +27,7 @@ void A_SpectralMissile (AActor *self, const char *missilename)
 {
 	if (self->target != NULL)
 	{
-		AActor *missile = P_SpawnMissileXYZ (self->x, self->y, self->z + 32*FRACUNIT, 
+		AActor *missile = P_SpawnMissileXYZ (self->PosPlusZ(32*FRACUNIT), 
 			self, self->target, PClass::FindActor(missilename), false);
 		if (missile != NULL)
 		{
@@ -78,7 +78,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_SpawnEntity)
 {
 	PARAM_ACTION_PROLOGUE;
 
-	AActor *entity = Spawn("EntityBoss", self->x, self->y, self->z + 70*FRACUNIT, ALLOW_REPLACE);
+	AActor *entity = Spawn("EntityBoss", self->PosPlusZ(70*FRACUNIT), ALLOW_REPLACE);
 	if (entity != NULL)
 	{
 		entity->angle = self->angle;
@@ -100,13 +100,10 @@ DEFINE_ACTION_FUNCTION(AActor, A_EntityDeath)
 	AActor *spot = self->tracer;
 	if (spot == NULL) spot = self;
 
-	fixed_t SpawnX = spot->x;
-	fixed_t SpawnY = spot->y;
-	fixed_t SpawnZ = spot->z + (self->tracer? 70*FRACUNIT : 0);
+	fixedvec3 pos = spot->Vec3Angle(secondRadius, self->angle, self->tracer? 70*FRACUNIT : 0);
 	
 	an = self->angle >> ANGLETOFINESHIFT;
-	second = Spawn("EntitySecond", SpawnX + FixedMul (secondRadius, finecosine[an]),
-		SpawnY + FixedMul (secondRadius, finesine[an]), SpawnZ, ALLOW_REPLACE);
+	second = Spawn("EntitySecond", pos, ALLOW_REPLACE);
 	second->CopyFriendliness(self, true);
 	//second->target = self->target;
 	A_FaceTarget (second);
@@ -114,18 +111,18 @@ DEFINE_ACTION_FUNCTION(AActor, A_EntityDeath)
 	second->velx += FixedMul (finecosine[an], 320000);
 	second->vely += FixedMul (finesine[an], 320000);
 
+	pos = spot->Vec3Angle(secondRadius, self->angle + ANGLE_90, self->tracer? 70*FRACUNIT : 0);
 	an = (self->angle + ANGLE_90) >> ANGLETOFINESHIFT;
-	second = Spawn("EntitySecond", SpawnX + FixedMul (secondRadius, finecosine[an]),
-		SpawnY + FixedMul (secondRadius, finesine[an]), SpawnZ, ALLOW_REPLACE);
+	second = Spawn("EntitySecond", pos, ALLOW_REPLACE);
 	second->CopyFriendliness(self, true);
 	//second->target = self->target;
 	second->velx = FixedMul (secondRadius, finecosine[an]) << 2;
 	second->vely = FixedMul (secondRadius, finesine[an]) << 2;
 	A_FaceTarget (second);
 
+	pos = spot->Vec3Angle(secondRadius, self->angle - ANGLE_90, self->tracer? 70*FRACUNIT : 0);
 	an = (self->angle - ANGLE_90) >> ANGLETOFINESHIFT;
-	second = Spawn("EntitySecond", SpawnX + FixedMul (secondRadius, finecosine[an]),
-		SpawnY + FixedMul (secondRadius, finesine[an]), SpawnZ, ALLOW_REPLACE);
+	second = Spawn("EntitySecond", pos, ALLOW_REPLACE);
 	second->CopyFriendliness(self, true);
 	//second->target = self->target;
 	second->velx = FixedMul (secondRadius, finecosine[an]) << 2;

src/g_strife/a_inquisitor.cpp

@@ -40,9 +40,9 @@ DEFINE_ACTION_FUNCTION(AActor, A_InquisitorDecide)
 	{
 		self->SetState (self->FindState("Grenade"));
 	}
-	if (self->target->z != self->z)
+	if (self->target->Z() != self->Z())
 	{
-		if (self->z + self->height + 54*FRACUNIT < self->ceilingz)
+		if (self->Top() + 54*FRACUNIT < self->ceilingz)
 		{
 			self->SetState (self->FindState("Jump"));
 		}
@@ -61,20 +61,20 @@ DEFINE_ACTION_FUNCTION(AActor, A_InquisitorAttack)
 
 	A_FaceTarget (self);
 
-	self->z += 32*FRACUNIT;
+	self->AddZ(32*FRACUNIT);
 	self->angle -= ANGLE_45/32;
-	proj = P_SpawnMissileZAimed (self, self->z, self->target, PClass::FindActor("InquisitorShot"));
+	proj = P_SpawnMissileZAimed (self, self->Z(), self->target, PClass::FindActor("InquisitorShot"));
 	if (proj != NULL)
 	{
 		proj->velz += 9*FRACUNIT;
 	}
 	self->angle += ANGLE_45/16;
-	proj = P_SpawnMissileZAimed (self, self->z, self->target, PClass::FindActor("InquisitorShot"));
+	proj = P_SpawnMissileZAimed (self, self->Z(), self->target, PClass::FindActor("InquisitorShot"));
 	if (proj != NULL)
 	{
 		proj->velz += 16*FRACUNIT;
 	}
-	self->z -= 32*FRACUNIT;
+	self->AddZ(-32*FRACUNIT);
 	return 0;
 }
 
@@ -90,7 +90,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_InquisitorJump)
 		return 0;
 
 	S_Sound (self, CHAN_ITEM|CHAN_LOOP, "inquisitor/jump", 1, ATTN_NORM);
-	self->z += 64*FRACUNIT;
+	self->AddZ(64*FRACUNIT);
 	A_FaceTarget (self);
 	an = self->angle >> ANGLETOFINESHIFT;
 	speed = self->Speed * 2/3;
@@ -102,7 +102,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_InquisitorJump)
 	{
 		dist = 1;
 	}
-	self->velz = (self->target->z - self->z) / dist;
+	self->velz = (self->target->Z() - self->Z()) / dist;
 	self->reactiontime = 60;
 	self->flags |= MF_NOGRAVITY;
 	return 0;
@@ -116,7 +116,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_InquisitorCheckLand)
 	if (self->reactiontime < 0 ||
 		self->velx == 0 ||
 		self->vely == 0 ||
-		self->z <= self->floorz)
+		self->Z() <= self->floorz)
 	{
 		self->SetState (self->SeeState);
 		self->reactiontime = 0;
@@ -134,8 +134,6 @@ DEFINE_ACTION_FUNCTION(AActor, A_InquisitorCheckLand)
 DEFINE_ACTION_FUNCTION(AActor, A_TossArm)
 {
 	PARAM_ACTION_PROLOGUE;
-
-	AActor *foo = Spawn("InquisitorArm", self->x, self->y, self->z + 24*FRACUNIT, ALLOW_REPLACE);
 	foo->angle = self->angle - ANGLE_90 + (pr_inq.Random2() << 22);
 	foo->velx = FixedMul (foo->Speed, finecosine[foo->angle >> ANGLETOFINESHIFT]) >> 3;
 	foo->vely = FixedMul (foo->Speed, finesine[foo->angle >> ANGLETOFINESHIFT]) >> 3;

src/g_strife/a_loremaster.cpp

@@ -21,16 +21,14 @@ IMPLEMENT_CLASS (ALoreShot)
 
 int ALoreShot::DoSpecialDamage (AActor *victim, int damage, FName damagetype)
 {
-	FVector3 thrust;
 	
 	if (victim != NULL && target != NULL && !(victim->flags7 & MF7_DONTTHRUST))
 	{
-		thrust.X = float(target->x - victim->x);
-		thrust.Y = float(target->y - victim->y);
-		thrust.Z = float(target->z - victim->z);
+		fixedvec3 fixthrust = victim->Vec3To(target);
+		TVector3<double> thrust(fixthrust.x, fixthrust.y, fixthrust.z);
 
 		thrust.MakeUnit();
-		thrust *= float((255*50*FRACUNIT) / (victim->Mass ? victim->Mass : 1));
+		thrust *= double((255*50*FRACUNIT) / (victim->Mass ? victim->Mass : 1));
 	
 		victim->velx += fixed_t(thrust.X);
 		victim->vely += fixed_t(thrust.Y);
@@ -44,8 +42,8 @@ DEFINE_ACTION_FUNCTION(AActor, A_LoremasterChain)
 	PARAM_ACTION_PROLOGUE;
 
 	S_Sound (self, CHAN_BODY, "loremaster/active", 1, ATTN_NORM);
-	Spawn("LoreShot2", self->x, self->y, self->z, ALLOW_REPLACE);
-	Spawn("LoreShot2", self->x - (self->velx >> 1), self->y - (self->vely >> 1), self->z - (self->velz >> 1), ALLOW_REPLACE);
-	Spawn("LoreShot2", self->x - self->velx, self->y - self->vely, self->z - self->velz, ALLOW_REPLACE);
+	Spawn("LoreShot2", self->Pos(), ALLOW_REPLACE);
+	Spawn("LoreShot2", self->Vec3Offset(-(self->velx >> 1), -(self->vely >> 1), -(self->velz >> 1)), ALLOW_REPLACE);
+	Spawn("LoreShot2", self->Vec3Offset(-self->velx, -self->vely, -self->velz), ALLOW_REPLACE);
 	return 0;
 }

src/g_strife/a_programmer.cpp

@@ -109,7 +109,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_SpotLightning)
 	if (self->target == NULL)
 		return 0;
 
-	spot = Spawn("SpectralLightningSpot", self->target->x, self->target->y, self->target->floorz, ALLOW_REPLACE);
+	spot = Spawn("SpectralLightningSpot", self->target->X(), self->target->Y(), self->target->floorz, ALLOW_REPLACE);
 	if (spot != NULL)
 	{
 		spot->threshold = 25;
@@ -129,8 +129,6 @@ DEFINE_ACTION_FUNCTION(AActor, A_SpotLightning)
 DEFINE_ACTION_FUNCTION(AActor, A_SpawnProgrammerBase)
 {
 	PARAM_ACTION_PROLOGUE;
-
-	AActor *foo = Spawn("ProgrammerBase", self->x, self->y, self->z + 24*FRACUNIT, ALLOW_REPLACE);
 	if (foo != NULL)
 	{
 		foo->angle = self->angle + ANGLE_180 + (pr_prog.Random2() << 22);

src/g_strife/a_rebels.cpp

@@ -80,8 +80,8 @@ DEFINE_ACTION_FUNCTION(AActor, A_Beacon)
 	AActor *rebel;
 	angle_t an;
 
-	rebel = Spawn("Rebel1", self->x, self->y, self->floorz, ALLOW_REPLACE);
-	if (!P_TryMove (rebel, rebel->x, rebel->y, true))
+	rebel = Spawn("Rebel1", self->X(), self->Y(), self->floorz, ALLOW_REPLACE);
+	if (!P_TryMove (rebel, rebel->X(), rebel->Y(), true))
 	{
 		rebel->Destroy ();
 		return 0;
@@ -117,7 +117,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_Beacon)
 	rebel->SetState (rebel->SeeState);
 	rebel->angle = self->angle;
 	an = self->angle >> ANGLETOFINESHIFT;
-	Spawn<ATeleportFog> (rebel->x + 20*finecosine[an], rebel->y + 20*finesine[an], rebel->z + TELEFOGHEIGHT, ALLOW_REPLACE);
+	Spawn<ATeleportFog> (rebel->Vec3Offset(20*finecosine[an], 20*finesine[an], TELEFOGHEIGHT), ALLOW_REPLACE);
 	if (--self->health < 0)
 	{
 		self->SetState(self->FindState(NAME_Death));

src/g_strife/a_sentinel.cpp

@@ -29,7 +29,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_SentinelBob)
 	{
 		minz = maxz;
 	}
-	if (minz < self->z)
+	if (minz < self->Z())
 	{
 		self->velz -= FRACUNIT;
 	}
@@ -37,7 +37,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_SentinelBob)
 	{
 		self->velz += FRACUNIT;
 	}
-	self->reactiontime = (minz >= self->z) ? 4 : 0;
+	self->reactiontime = (minz >= self->Z()) ? 4 : 0;
 	return 0;
 }
 
@@ -53,16 +53,14 @@ DEFINE_ACTION_FUNCTION(AActor, A_SentinelAttack)
 		return 0;
 	}
 
-	missile = P_SpawnMissileZAimed (self, self->z + 32*FRACUNIT, self->target, PClass::FindActor("SentinelFX2"));
+	missile = P_SpawnMissileZAimed (self, self->Z() + 32*FRACUNIT, self->target, PClass::FindActor("SentinelFX2"));
 
 	if (missile != NULL && (missile->velx | missile->vely) != 0)
 	{
 		for (int i = 8; i > 1; --i)
 		{
 			trail = Spawn("SentinelFX1",
-				self->x + FixedMul (missile->radius * i, finecosine[missile->angle >> ANGLETOFINESHIFT]),
-				self->y + FixedMul (missile->radius * i, finesine[missile->angle >> ANGLETOFINESHIFT]),
-				missile->z + (missile->velz / 4 * i), ALLOW_REPLACE);
+				self->Vec3Angle(missile->radius*i, missile->angle, (missile->velz / 4 * i)), ALLOW_REPLACE);
 			if (trail != NULL)
 			{
 				trail->target = self;
@@ -72,7 +70,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_SentinelAttack)
 				P_CheckMissileSpawn (trail, self->radius);
 			}
 		}
-		missile->z += missile->velz >> 2;
+		missile->AddZ(missile->velz >> 2);
 	}
 	return 0;
 }

src/g_strife/a_spectral.cpp

@@ -28,7 +28,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_SpectralLightningTail)
 {
 	PARAM_ACTION_PROLOGUE;
 
-	AActor *foo = Spawn("SpectralLightningHTail", self->x - self->velx, self->y - self->vely, self->z, ALLOW_REPLACE);
+	AActor *foo = Spawn("SpectralLightningHTail", self->Vec3Offset(-self->velx, -self->vely, 0), ALLOW_REPLACE);
 
 	foo->angle = self->angle;
 	foo->FriendPlayer = self->FriendPlayer;
@@ -67,17 +67,18 @@ DEFINE_ACTION_FUNCTION(AActor, A_SpectralLightning)
 	self->velx += pr_zap5.Random2(3) << FRACBITS;
 	self->vely += pr_zap5.Random2(3) << FRACBITS;
 
-	x = self->x + pr_zap5.Random2(3) * FRACUNIT * 50;
-	y = self->y + pr_zap5.Random2(3) * FRACUNIT * 50;
+	fixedvec2 pos = self->Vec2Offset(
+		pr_zap5.Random2(3) * FRACUNIT * 50,
+		pr_zap5.Random2(3) * FRACUNIT * 50);
 
 	flash = Spawn (self->threshold > 25 ? PClass::FindActor(NAME_SpectralLightningV2) :
-		PClass::FindActor(NAME_SpectralLightningV1), x, y, ONCEILINGZ, ALLOW_REPLACE);
+		PClass::FindActor(NAME_SpectralLightningV1), pos.x, pos.y, ONCEILINGZ, ALLOW_REPLACE);
 
 	flash->target = self->target;
 	flash->velz = -18*FRACUNIT;
 	flash->FriendPlayer = self->FriendPlayer;
 
-	flash = Spawn(NAME_SpectralLightningV2, self->x, self->y, ONCEILINGZ, ALLOW_REPLACE);
+	flash = Spawn(NAME_SpectralLightningV2, self->X(), self->Y(), ONCEILINGZ, ALLOW_REPLACE);
 
 	flash->target = self->target;
 	flash->velz = -18*FRACUNIT;
@@ -137,11 +138,11 @@ DEFINE_ACTION_FUNCTION(AActor, A_Tracer2)
 		}
 		if (dest->height >= 56*FRACUNIT)
 		{
-			slope = (dest->z+40*FRACUNIT - self->z) / dist;
+			slope = (dest->Z()+40*FRACUNIT - self->Z()) / dist;
 		}
 		else
 		{
-			slope = (dest->z + self->height*2/3 - self->z) / dist;
+			slope = (dest->Z() + self->height*2/3 - self->Z()) / dist;
 		}
 		if (slope < self->velz)
 		{

src/g_strife/a_stalker.cpp

@@ -19,7 +19,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_StalkerChaseDecide)
 	{
 		self->SetState (self->FindState("SeeFloor"));
 	}
-	else if (self->ceilingz - self->height > self->z)
+	else if (self->ceilingz > self->Top())
 	{
 		self->SetState (self->FindState("Drop"));
 	}

src/g_strife/a_strifestuff.cpp

@@ -597,7 +597,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_TossGib)
 	PARAM_ACTION_PROLOGUE;
 
 	const char *gibtype = (self->flags & MF_NOBLOOD) ? "Junk" : "Meat";
-	AActor *gib = Spawn (gibtype, self->x, self->y, self->z + 24*FRACUNIT, ALLOW_REPLACE);
+	AActor *gib = Spawn (gibtype, self->PosPlusZ(24*FRACUNIT), ALLOW_REPLACE);
 	angle_t an;
 	int speed;
 
@@ -657,7 +657,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_CheckTerrain)
 
 	sector_t *sec = self->Sector;
 
-	if (self->z == sec->floorplane.ZatPoint(self))
+	if (self->Z() == sec->floorplane.ZatPoint(self))
 	{
 		if (sec->special == Damage_InstantDeath)
 		{
@@ -718,8 +718,6 @@ DEFINE_ACTION_FUNCTION(AActor, A_ItBurnsItBurns)
 DEFINE_ACTION_FUNCTION(AActor, A_DropFire)
 {
 	PARAM_ACTION_PROLOGUE;
-
-	AActor *drop = Spawn("FireDroplet", self->x, self->y, self->z + 24*FRACUNIT, ALLOW_REPLACE);
 	drop->velz = -FRACUNIT;
 	P_RadiusAttack (self, self, 64, 64, NAME_Fire, 0);
 	return 0;

src/g_strife/a_strifeweapons.cpp

@@ -379,8 +379,8 @@ DEFINE_ACTION_FUNCTION(AActor, A_RocketInFlight)
 	AActor *trail;
 
 	S_Sound (self, CHAN_VOICE, "misc/missileinflight", 1, ATTN_NORM);
-	P_SpawnPuff (self, PClass::FindActor("MiniMissilePuff"), self->x, self->y, self->z, self->angle - ANGLE_180, 2, PF_HITTHING);
-	trail = Spawn("RocketTrail", self->x - self->velx, self->y - self->vely, self->z, ALLOW_REPLACE);
+	P_SpawnPuff (self, PClass::FindActor("MiniMissilePuff"), self->Pos(), self->angle - ANGLE_180, 2, PF_HITTHING);
+	trail = Spawn("RocketTrail", self->Vec3Offset(-self->velx, -self->vely, 0), ALLOW_REPLACE);
 	if (trail != NULL)
 	{
 		trail->velz = FRACUNIT;
@@ -551,10 +551,10 @@ DEFINE_ACTION_FUNCTION(AActor, A_MaulerTorpedoWave)
 	self->angle += ANGLE_180;
 
 	// If the torpedo hit the ceiling, it should still spawn the wave
-	savedz = self->z;
-	if (wavedef && self->ceilingz - self->z < wavedef->height)
+	savedz = self->Z();
+	if (wavedef && self->ceilingz - self->Z() < wavedef->height)
 	{
-		self->z = self->ceilingz - wavedef->height;
+		self->SetZ(self->ceilingz - wavedef->height);
 	}
 
 	for (int i = 0; i < 80; ++i)
@@ -562,13 +562,13 @@ DEFINE_ACTION_FUNCTION(AActor, A_MaulerTorpedoWave)
 		self->angle += ANGLE_45/10;
 		P_SpawnSubMissile (self, PClass::FindActor("MaulerTorpedoWave"), self->target);
 	}
-	self->z = savedz;
+	self->SetZ(savedz);
 	return 0;
 }
 
 AActor *P_SpawnSubMissile (AActor *source, PClassActor *type, AActor *target)
 {
-	AActor *other = Spawn (type, source->x, source->y, source->z, ALLOW_REPLACE);
+	AActor *other = Spawn (type, source->Pos(), ALLOW_REPLACE);
 
 	if (other == NULL)
 	{
@@ -660,20 +660,19 @@ DEFINE_ACTION_FUNCTION(AActor, A_Burnination)
 			yofs = -yofs;
 		}
 
-		fixed_t x = self->x + (xofs << FRACBITS);
-		fixed_t y = self->y + (yofs << FRACBITS);
-		sector_t * sector = P_PointInSector(x, y);
+		fixedvec2 pos = self->Vec2Offset(xofs << FRACBITS, yofs << FRACBITS);
+		sector_t * sector = P_PointInSector(pos.x, pos.y);
 
 		// The sector's floor is too high so spawn the flame elsewhere.
-		if (sector->floorplane.ZatPoint(x, y) > self->z + self->MaxStepHeight)
+		if (sector->floorplane.ZatPoint(pos.x, pos.y) > self->Z() + self->MaxStepHeight)
 		{
-			x = self->x;
-			y = self->y;
+			pos.x = self->X();
+			pos.y = self->Y();
 		}
 
 		AActor *drop = Spawn<APhosphorousFire> (
-			x, y,
-			self->z + 4*FRACUNIT, ALLOW_REPLACE);
+			pos.x, pos.y,
+			self->Z() + 4*FRACUNIT, ALLOW_REPLACE);
 		if (drop != NULL)
 		{
 			drop->velx = self->velx + ((pr_phburn.Random2 (7)) << FRACBITS);
@@ -718,9 +717,9 @@ DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_FireGrenade)
 
 	if (grenadetype != NULL)
 	{
-		self->z += 32*FRACUNIT;
+		self->AddZ(32*FRACUNIT);
 		grenade = P_SpawnSubMissile (self, grenadetype, self);
-		self->z -= 32*FRACUNIT;
+		self->AddZ(-32*FRACUNIT);
 		if (grenade == NULL)
 			return 0;
 
@@ -731,15 +730,20 @@ DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_FireGrenade)
 
 		grenade->velz = FixedMul (finetangent[FINEANGLES/4-(self->pitch>>ANGLETOFINESHIFT)], grenade->Speed) + 8*FRACUNIT;
 
+		fixedvec2 offset;
+
 		an = self->angle >> ANGLETOFINESHIFT;
 		tworadii = self->radius + grenade->radius;
-		grenade->x += FixedMul (finecosine[an], tworadii);
-		grenade->y += FixedMul (finesine[an], tworadii);
+		offset.x = FixedMul (finecosine[an], tworadii);
+		offset.y = FixedMul (finesine[an], tworadii);
 
 		an = self->angle + angleofs;
 		an >>= ANGLETOFINESHIFT;
-		grenade->x += FixedMul (finecosine[an], 15*FRACUNIT);
-		grenade->y += FixedMul (finesine[an], 15*FRACUNIT);
+		offset.x += FixedMul (finecosine[an], 15*FRACUNIT);
+		offset.y += FixedMul (finesine[an], 15*FRACUNIT);
+
+		fixedvec2 newpos = grenade->Vec2Offset(offset.x, offset.y);
+		grenade->SetOrigin(newpos.x, newpos.y, grenade->Z(), false);
 	}
 	return 0;
 }
@@ -985,7 +989,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_FireSigil1)
 	P_BulletSlope (self, &linetarget);
 	if (linetarget != NULL)
 	{
-		spot = Spawn("SpectralLightningSpot", linetarget->x, linetarget->y, linetarget->floorz, ALLOW_REPLACE);
+		spot = Spawn("SpectralLightningSpot", linetarget->X(), linetarget->Y(), linetarget->floorz, ALLOW_REPLACE);
 		if (spot != NULL)
 		{
 			spot->tracer = linetarget;
@@ -993,7 +997,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_FireSigil1)
 	}
 	else
 	{
-		spot = Spawn("SpectralLightningSpot", self->x, self->y, self->z, ALLOW_REPLACE);
+		spot = Spawn("SpectralLightningSpot", self->Pos(), ALLOW_REPLACE);
 		if (spot != NULL)
 		{
 			spot->velx += 28 * finecosine[self->angle >> ANGLETOFINESHIFT];
@@ -1057,7 +1061,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_FireSigil3)
 		spot = P_SpawnSubMissile (self, PClass::FindActor("SpectralLightningBall1"), self);
 		if (spot != NULL)
 		{
-			spot->z = self->z + 32*FRACUNIT;
+			spot->SetZ(self->Z() + 32*FRACUNIT);
 		}
 	}
 	self->angle -= (ANGLE_180/20)*10;

src/g_strife/a_thingstoblowup.cpp

@@ -20,10 +20,9 @@ DEFINE_ACTION_FUNCTION(AActor, A_Bang4Cloud)
 
 	fixed_t spawnx, spawny;
 
-	spawnx = self->x + (pr_bang4cloud.Random2() & 3) * 10240;
-	spawny = self->y + (pr_bang4cloud.Random2() & 3) * 10240;
+	fixedvec3 pos = self->Vec3Offset((pr_bang4cloud.Random2() & 3) * 10240, (pr_bang4cloud.Random2() & 3) * 10240, 0);
 
-	Spawn("Bang4Cloud", spawnx, spawny, self->z, ALLOW_REPLACE);
+	Spawn("Bang4Cloud", pos, ALLOW_REPLACE);
 	return 0;
 }
 
@@ -110,7 +109,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_LightGoesOut)
 
 	for (int i = 0; i < 8; ++i)
 	{
-		foo = Spawn("Rubble1", self->x, self->y, self->z, ALLOW_REPLACE);
+		foo = Spawn("Rubble1", self->Pos(), ALLOW_REPLACE);
 		if (foo != NULL)
 		{
 			int t = pr_lightout() & 15;

src/nodebuild_utility.cpp

@@ -76,7 +76,8 @@ angle_t FNodeBuilder::PointToAngle (fixed_t x, fixed_t y)
 #else // !__APPLE__ || __llvm__
 	double ang = atan2 (double(y), double(x));
 #endif // __APPLE__ && !__llvm__
-	return angle_t(ang * rad2bam) << 1;
+	// Convert to signed first since negative double to unsigned is undefined.
+	return angle_t(int(ang * rad2bam)) << 1;
 }
 
 void FNodeBuilder::FindUsedVertices (vertex_t *oldverts, int max)

src/p_3dfloors.cpp

@@ -337,7 +337,7 @@ void P_PlayerOnSpecial3DFloor(player_t* player)
 		{
 			//Water and DEATH FOG!!! heh
 			if (player->mo->Z() > rover->top.plane->ZatPoint(player->mo) || 
-				(player->mo->Z() + player->mo->height) < rover->bottom.plane->ZatPoint(player->mo))
+				player->mo->Top() < rover->bottom.plane->ZatPoint(player->mo))
 				continue;
 		}
 

src/p_3dfloors.h

@@ -144,6 +144,10 @@ void P_LineOpening_XFloors (FLineOpening &open, AActor * thing, const line_t *li
 
 secplane_t P_FindFloorPlane(sector_t * sector, fixed_t x, fixed_t y, fixed_t z);
 int	P_Find3DFloor(sector_t * sec, fixed_t x, fixed_t y, fixed_t z, bool above, bool floor, fixed_t &cmpz);
+inline int	P_Find3DFloor(sector_t * sec, const fixedvec3 &pos, bool above, bool floor, fixed_t &cmpz)
+{
+	return P_Find3DFloor(sec, pos.x, pos.y, pos.z, above, floor, cmpz);
+}
 							
 
 #endif

src/p_acs.cpp

@@ -4157,7 +4157,7 @@ bool DLevelScript::DoCheckActorTexture(int tid, AActor *activator, int string, b
 	}
 	else
 	{
-		fixed_t z = actor->Z() + actor->height;
+		fixed_t z = actor->Top();
 		// Looking through planes from bottom to top
 		for (i = numff-1; i >= 0; --i)
 		{

src/p_effect.cpp

@@ -451,9 +451,7 @@ void P_RunEffect (AActor *actor, int effects)
 	{
 		// Grenade trail
 
-		fixedvec3 pos = actor->Vec3Offset(
-			-FixedMul(finecosine[(moveangle) >> ANGLETOFINESHIFT], actor->radius * 2),
-			-FixedMul(finesine[(moveangle) >> ANGLETOFINESHIFT], actor->radius * 2),
+		fixedvec3 pos = actor->Vec3Angle(-actor->radius * 2, moveangle,
 			-(actor->height >> 3) * (actor->velz >> 16) + (2 * actor->height) / 3);
 
 		P_DrawSplash2 (6, pos.x, pos.y, pos.z,

src/p_enemy.cpp

@@ -243,9 +243,9 @@ bool AActor::CheckMeleeRange ()
 	// [RH] Don't melee things too far above or below actor.
 	if (!(flags5 & MF5_NOVERTICALMELEERANGE))
 	{
-		if (pl->Z() > z + height)
+		if (pl->Z() > Top())
 			return false;
-		if (pl->Z() + pl->height < z)
+		if (pl->Top() < Z())
 			return false;
 	}
 
@@ -280,11 +280,11 @@ bool P_CheckMeleeRange2 (AActor *actor)
 	{
 		return false;
 	}
-	if (mo->Z() > actor->Z()+actor->height)
+	if (mo->Z() > actor->Top())
 	{ // Target is higher than the attacker
 		return false;
 	}
-	else if (actor->Z() > mo->Z()+mo->height)
+	else if (actor->Z() > mo->Top())
 	{ // Attacker is higher
 		return false;
 	}
@@ -473,8 +473,8 @@ bool P_Move (AActor *actor)
 		}
 	}
 
-	tryx = (origx = actor->x) + (deltax = FixedMul (speed, xspeed[actor->movedir]));
-	tryy = (origy = actor->y) + (deltay = FixedMul (speed, yspeed[actor->movedir]));
+	tryx = (origx = actor->X()) + (deltax = FixedMul (speed, xspeed[actor->movedir]));
+	tryy = (origy = actor->Y()) + (deltay = FixedMul (speed, yspeed[actor->movedir]));
 
 	// Like P_XYMovement this should do multiple moves if the step size is too large
 
@@ -519,15 +519,14 @@ bool P_Move (AActor *actor)
 	// so make it switchable
 	if (nomonsterinterpolation)
 	{
-		actor->PrevX = actor->x;
-		actor->PrevY = actor->y;
-		actor->PrevZ = actor->z;
+		actor->PrevX = actor->X();
+		actor->PrevY = actor->Y();
+		actor->PrevZ = actor->Z();
 	}
 
 	if (try_ok && friction > ORIG_FRICTION)
 	{
-		actor->x = origx;
-		actor->y = origy;
+		actor->SetOrigin(origx, origy, actor->Z(), false);
 		movefactor *= FRACUNIT / ORIG_FRICTION_FACTOR / 4;
 		actor->velx += FixedMul (deltax, movefactor);
 		actor->vely += FixedMul (deltay, movefactor);
@@ -543,12 +542,12 @@ bool P_Move (AActor *actor)
 		if (actor->Y() <= actor->floorz + actor->MaxStepHeight)
 		{
 			fixed_t savedz = actor->Z();
-			actor->z = actor->floorz;
+			actor->SetZ(actor->floorz);
 			// Make sure that there isn't some other actor between us and
 			// the floor we could get stuck in. The old code did not do this.
 			if (!P_TestMobjZ(actor))
 			{
-				actor->z = savedz;
+				actor->SetZ(savedz);
 			}
 			else
 			{ // The monster just hit the floor, so trigger any actions.
@@ -568,10 +567,10 @@ bool P_Move (AActor *actor)
 		{ // must adjust height
 			fixed_t savedz = actor->Z();
 
-			if (actor->z < tm.floorz)
-				actor->z += actor->FloatSpeed;
+			if (actor->Z() < tm.floorz)
+				actor->AddZ(actor->FloatSpeed);
 			else
-				actor->z -= actor->FloatSpeed;
+				actor->AddZ(-actor->FloatSpeed);
 
 
 			// [RH] Check to make sure there's nothing in the way of the float
@@ -580,7 +579,7 @@ bool P_Move (AActor *actor)
 				actor->flags |= MF_INFLOAT;
 				return true;
 			}
-			actor->z = savedz;
+			actor->SetZ(savedz);
 		}
 
 		if (!spechit.Size ())
@@ -812,28 +811,25 @@ void P_DoNewChaseDir (AActor *actor, fixed_t deltax, fixed_t deltay)
 
 void P_NewChaseDir(AActor * actor)
 {
-	fixed_t deltax;
-	fixed_t deltay;
+	fixedvec2 delta;
 
 	actor->strafecount = 0;
 
 	if ((actor->flags5&MF5_CHASEGOAL || actor->goal == actor->target) && actor->goal!=NULL)
 	{
-		deltax = actor->goal->x - actor->x;
-		deltay = actor->goal->y - actor->y;
+		delta = actor->Vec2To(actor->goal);
 	}
 	else if (actor->target != NULL)
 	{
-		deltax = actor->target->x - actor->x;
-		deltay = actor->target->y - actor->y;
+		delta = actor->Vec2To(actor->target);
 
 		if (!(actor->flags6 & MF6_NOFEAR))
 		{
 			if ((actor->target->player != NULL && (actor->target->player->cheats & CF_FRIGHTENING)) || 
 				(actor->flags4 & MF4_FRIGHTENED))
 			{
-				deltax = -deltax;
-				deltay = -deltay;
+				delta.x = -delta.x;
+				delta.y = -delta.y;
 			}
 		}
 	}
@@ -877,7 +873,7 @@ void P_NewChaseDir(AActor * actor)
 				{
 					angle = R_PointToAngle2(0,0,line->dx,line->dy);   // front side dropoff
 				}
-				else if (front == actor->z && back < actor->z - actor->MaxDropOffHeight)
+				else if (front == actor->Z() && back < actor->Z() - actor->MaxDropOffHeight)
 				{
 					angle = R_PointToAngle2(line->dx,line->dy,0,0); // back side dropoff
 				}
@@ -946,12 +942,12 @@ void P_NewChaseDir(AActor * actor)
 			if (ismeleeattacker)
 			{
 				actor->strafecount = pr_enemystrafe() & 15;
-				deltax = -deltax, deltay = -deltay;
+				delta.x = -delta.x, delta.y = -delta.y;
 			}
 	    }
 	}
 
-	P_DoNewChaseDir(actor, deltax, deltay);
+	P_DoNewChaseDir(actor, delta.x, delta.y);
 
 	// If strafing, set movecount to strafecount so that old Doom
 	// logic still works the same, except in the strafing part
@@ -983,7 +979,7 @@ void P_RandomChaseDir (AActor *actor)
 	if (actor->flags & MF_FRIENDLY)
 	{
 		AActor *player;
-		fixed_t deltax, deltay;
+		fixedvec2 delta;
 		dirtype_t d[3];
 
 		if (actor->FriendPlayer != 0)
@@ -1005,19 +1001,18 @@ void P_RandomChaseDir (AActor *actor)
 		{
 			if (pr_newchasedir() & 1 || !P_CheckSight (actor, player))
 			{
-				deltax = player->x - actor->x;
-				deltay = player->y - actor->y;
+				delta = actor->Vec2To(player);
 
-				if (deltax>128*FRACUNIT)
+				if (delta.x>128*FRACUNIT)
 					d[1]= DI_EAST;
-				else if (deltax<-128*FRACUNIT)
+				else if (delta.x<-128*FRACUNIT)
 					d[1]= DI_WEST;
 				else
 					d[1]=DI_NODIR;
 
-				if (deltay<-128*FRACUNIT)
+				if (delta.y<-128*FRACUNIT)
 					d[2]= DI_SOUTH;
-				else if (deltay>128*FRACUNIT)
+				else if (delta.y>128*FRACUNIT)
 					d[2]= DI_NORTH;
 				else
 					d[2]=DI_NODIR;
@@ -1025,13 +1020,13 @@ void P_RandomChaseDir (AActor *actor)
 				// try direct route
 				if (d[1] != DI_NODIR && d[2] != DI_NODIR)
 				{
-					actor->movedir = diags[((deltay<0)<<1) + (deltax>0)];
+					actor->movedir = diags[((delta.y<0)<<1) + (delta.x>0)];
 					if (actor->movedir != turnaround && P_TryWalk(actor))
 						return;
 				}
 
 				// try other directions
-				if (pr_newchasedir() > 200 || abs(deltay) > abs(deltax))
+				if (pr_newchasedir() > 200 || abs(delta.y) > abs(delta.x))
 				{
 					swapvalues (d[1], d[2]);
 				}
@@ -2488,8 +2483,8 @@ void A_DoChase (VMFrameStack *stack, AActor *actor, bool fastchase, FState *mele
 	if ((!fastchase || !actor->FastChaseStrafeCount) && !dontmove)
 	{
 		// CANTLEAVEFLOORPIC handling was completely missing in the non-serpent functions.
-		fixed_t oldX = actor->x;
-		fixed_t oldY = actor->y;
+		fixed_t oldX = actor->X();
+		fixed_t oldY = actor->Y();
 		FTextureID oldFloor = actor->floorpic;
 
 		// chase towards player
@@ -2540,11 +2535,12 @@ static bool P_CheckForResurrection(AActor *self, bool usevilestates)
 	if (self->movedir != DI_NODIR)
 	{
 		const fixed_t absSpeed = abs (self->Speed);
-		fixed_t viletryx = self->x + FixedMul (absSpeed, xspeed[self->movedir]);
-		fixed_t viletryy = self->y + FixedMul (absSpeed, yspeed[self->movedir]);
+		fixedvec2 viletry = self->Vec2Offset(
+			FixedMul (absSpeed, xspeed[self->movedir]),
+			FixedMul (absSpeed, yspeed[self->movedir]), true);
 		AActor *corpsehit;
 
-		FBlockThingsIterator it(FBoundingBox(viletryx, viletryy, 32*FRACUNIT));
+		FBlockThingsIterator it(FBoundingBox(viletry.x, viletry.y, 32*FRACUNIT));
 		while ((corpsehit = it.Next()))
 		{
 			FState *raisestate = corpsehit->GetRaiseState();
@@ -2553,8 +2549,8 @@ static bool P_CheckForResurrection(AActor *self, bool usevilestates)
 				// use the current actor's radius instead of the Arch Vile's default.
 				fixed_t maxdist = corpsehit->GetDefault()->radius + self->radius;
 
-				if (abs(corpsehit->x - viletryx) > maxdist ||
-					abs(corpsehit->y - viletryy) > maxdist)
+				if (abs(corpsehit->X() - viletry.x) > maxdist ||
+					abs(corpsehit->Y() - viletry.y) > maxdist)
 					continue;			// not actually touching
 				// Let's check if there are floors in between the archvile and its target
 				sector_t *vilesec = self->Sector;
@@ -2565,8 +2561,8 @@ static bool P_CheckForResurrection(AActor *self, bool usevilestates)
 				if (testsec)
 				{
 					fixed_t zdist1, zdist2;
-					if (P_Find3DFloor(testsec, corpsehit->X(), corpsehit->Y(), corpsehit->Z(), false, true, zdist1)
-						!= P_Find3DFloor(testsec, self->X(), self->Y(), self->Z(), false, true, zdist2))
+					if (P_Find3DFloor(testsec, corpsehit->Pos(), false, true, zdist1)
+						!= P_Find3DFloor(testsec, self->Pos(), false, true, zdist2))
 					{
 						// Not on same floor
 						if (vilesec == corpsec || abs(zdist1 - self->Z()) > self->height)
@@ -2583,7 +2579,7 @@ static bool P_CheckForResurrection(AActor *self, bool usevilestates)
 
 				corpsehit->flags |= MF_SOLID;
 				corpsehit->height = corpsehit->GetDefault()->height;
-				bool check = P_CheckPosition(corpsehit, corpsehit->X(), corpsehit->Y());
+				bool check = P_CheckPosition(corpsehit, corpsehit->Pos());
 				corpsehit->flags = oldflags;
 				corpsehit->radius = oldradius;
 				corpsehit->height = oldheight;
@@ -2804,18 +2800,15 @@ void A_Face (AActor *self, AActor *other, angle_t max_turn, angle_t max_pitch, a
 	// disabled and is so by default.
 	if (max_pitch <= ANGLE_180)
 	{
-		// [DH] Don't need to do proper fixed->double conversion, since the
-		// result is only used in a ratio.
-		double dist_x = other->x - self->x;
-		double dist_y = other->y - self->y;
+		TVector2<double> dist = self->Vec2To(other);
 		
 		// Positioning ala missile spawning, 32 units above foot level
-		fixed_t source_z = self->z + 32*FRACUNIT + self->GetBobOffset();
-		fixed_t target_z = other->z + 32*FRACUNIT + other->GetBobOffset();
+		fixed_t source_z = self->Z() + 32*FRACUNIT + self->GetBobOffset();
+		fixed_t target_z = other->Z() + 32*FRACUNIT + other->GetBobOffset();
 
 		// If the target z is above the target's head, reposition to the middle of
 		// its body.		
-		if (target_z >= other->Z() + other->height)
+		if (target_z >= other->Top())
 		{
 			target_z = other->Z() + (other->height / 2);
 		}
@@ -2831,9 +2824,9 @@ void A_Face (AActor *self, AActor *other, angle_t max_turn, angle_t max_pitch, a
 		if (!(flags & FAF_NODISTFACTOR))
 			target_z += pitch_offset;
 
-		double dist_z = target_z - source_z;
-		double dist = sqrt(dist_x*dist_x + dist_y*dist_y + dist_z*dist_z);
-		int other_pitch = (int)rad2bam(asin(dist_z / dist));
+		double dist_z = FIXED2DBL(target_z - source_z);
+		double ddist = sqrt(dist.X*dist.X + dist.Y*dist.Y + dist_z*dist_z);
+		int other_pitch = (int)rad2bam(asin(dist_z / ddist));
 		
 		if (max_pitch != 0)
 		{
@@ -2950,9 +2943,8 @@ DEFINE_ACTION_FUNCTION(AActor, A_MonsterRail)
 	if (linetarget == NULL)
 	{
 		// We probably won't hit the target, but aim at it anyway so we don't look stupid.
-		TVector2<double> xydiff(self->target->x - self->x, self->target->y - self->y);
-		double zdiff = (self->target->z + (self->target->height>>1)) -
-						(self->z + (self->height>>1) - self->floorclip);
+		TVector2<double> xydiff = self->Vec2To(self->target);
+		double zdiff = FIXED2DBL((self->target->Z() + (self->target->height>>1)) - (self->Z() + (self->height>>1) - self->floorclip));
 		self->pitch = int(atan2(zdiff, xydiff.Length()) * ANGLE_180 / -M_PI);
 	}
 

src/p_lnspec.cpp

@@ -3107,7 +3107,7 @@ FUNC(LS_GlassBreak)
 			{
 				glass = Spawn("GlassJunk", x, y, ONFLOORZ, ALLOW_REPLACE);
 
-				glass->z += 24 * FRACUNIT;
+				glass->AddZ(24 * FRACUNIT);
 				glass->SetState (glass->SpawnState + (pr_glass() % glass->health));
 				an = pr_glass() << (32-8);
 				glass->angle = an;

src/p_local.h

@@ -134,6 +134,10 @@ enum EPuffFlags
 };
 
 AActor *P_SpawnPuff (AActor *source, PClassActor *pufftype, fixed_t x, fixed_t y, fixed_t z, angle_t dir, int updown, int flags = 0, AActor *vict = NULL);
+inline AActor *P_SpawnPuff(AActor *source, const PClass *pufftype, const fixedvec3 &pos, angle_t dir, int updown, int flags = 0, AActor *vict = NULL)
+{
+	return P_SpawnPuff(source, pufftype, pos.x, pos.y, pos.z, dir, updown, flags, vict);
+}
 void	P_SpawnBlood (fixed_t x, fixed_t y, fixed_t z, angle_t dir, int damage, AActor *originator);
 void	P_BloodSplatter (fixed_t x, fixed_t y, fixed_t z, AActor *originator);
 void	P_BloodSplatter2 (fixed_t x, fixed_t y, fixed_t z, AActor *originator);
@@ -141,10 +145,13 @@ void	P_RipperBlood (AActor *mo, AActor *bleeder);
 int		P_GetThingFloorType (AActor *thing);
 void	P_ExplodeMissile (AActor *missile, line_t *explodeline, AActor *target);
 
-AActor * P_OldSpawnMissile(AActor *source, AActor *owner, AActor *dest, PClassActor *type);
 AActor *P_SpawnMissile (AActor* source, AActor* dest, PClassActor *type, AActor* owner = NULL);
 AActor *P_SpawnMissileZ (AActor* source, fixed_t z, AActor* dest, PClassActor *type);
 AActor *P_SpawnMissileXYZ (fixed_t x, fixed_t y, fixed_t z, AActor *source, AActor *dest, PClassActor *type, bool checkspawn = true, AActor *owner = NULL);
+inline AActor *P_SpawnMissileXYZ(const fixedvec3 &pos, AActor *source, AActor *dest, PClassActor *type, bool checkspawn = true, AActor *owner = NULL)
+{
+	return P_SpawnMissileXYZ(pos.x, pos.y, pos.z, source, dest, type, checkspawn, owner);
+}
 AActor *P_SpawnMissileAngle (AActor *source, PClassActor *type, angle_t angle, fixed_t velz);
 AActor *P_SpawnMissileAngleSpeed (AActor *source, PClassActor *type, angle_t angle, fixed_t velz, fixed_t speed);
 AActor *P_SpawnMissileAngleZ (AActor *source, fixed_t z, PClassActor *type, angle_t angle, fixed_t velz);
@@ -462,6 +469,10 @@ bool	P_TestMobjLocation (AActor *mobj);
 bool	P_TestMobjZ (AActor *mobj, bool quick=true, AActor **pOnmobj = NULL);
 bool	P_CheckPosition (AActor *thing, fixed_t x, fixed_t y, FCheckPosition &tm, bool actorsonly=false);
 bool	P_CheckPosition (AActor *thing, fixed_t x, fixed_t y, bool actorsonly=false);
+inline bool P_CheckPosition(AActor *thing, const fixedvec3 &pos, bool actorsonly = false)
+{
+	return P_CheckPosition(thing, pos.x, pos.y, actorsonly);
+}
 AActor	*P_CheckOnmobj (AActor *thing);
 void	P_FakeZMovement (AActor *mo);
 bool	P_TryMove (AActor* thing, fixed_t x, fixed_t y, int dropoff, const secplane_t * onfloor, FCheckPosition &tm, bool missileCheck = false);
@@ -469,6 +480,10 @@ bool	P_TryMove (AActor* thing, fixed_t x, fixed_t y, int dropoff, const secplane
 bool	P_CheckMove(AActor *thing, fixed_t x, fixed_t y);
 void	P_ApplyTorque(AActor *mo);
 bool	P_TeleportMove (AActor* thing, fixed_t x, fixed_t y, fixed_t z, bool telefrag, bool modifyactor = true);	// [RH] Added z and telefrag parameters
+inline bool	P_TeleportMove(AActor* thing, const fixedvec3 &pos, bool telefrag, bool modifyactor = true)
+{
+	return P_TeleportMove(thing, pos.x, pos.y, pos.z, telefrag, modifyactor);
+}
 void	P_PlayerStartStomp (AActor *actor);		// [RH] Stomp on things for a newly spawned player
 void	P_SlideMove (AActor* mo, fixed_t tryx, fixed_t tryy, int numsteps);
 bool	P_BounceWall (AActor *mo);

src/p_map.cpp

@@ -190,7 +190,7 @@ static bool PIT_FindFloorCeiling(line_t *ld, const FBoundingBox &box, FCheckPosi
 		}
 		else if (r >= (1 << 24))
 		{
-			P_LineOpening(open, tmf.thing, ld, sx = ld->v2->x, sy = ld->v2->y, tmf.thing->x, tmf.thing->y, flags);
+			P_LineOpening(open, tmf.thing, ld, sx = ld->v2->x, sy = ld->v2->y, tmf.thing->X(), tmf.thing->Y(), flags);
 		}
 		else
 		{
@@ -288,9 +288,9 @@ void P_FindFloorCeiling(AActor *actor, int flags)
 	FCheckPosition tmf;
 
 	tmf.thing = actor;
-	tmf.x = actor->x;
-	tmf.y = actor->y;
-	tmf.z = actor->z;
+	tmf.x = actor->X();
+	tmf.y = actor->Y();
+	tmf.z = actor->Z();
 
 	if (flags & FFCF_ONLYSPAWNPOS)
 	{
@@ -336,7 +336,7 @@ void P_FindFloorCeiling(AActor *actor, int flags)
 
 	if (tmf.touchmidtex) tmf.dropoffz = tmf.floorz;
 
-	if (!(flags & FFCF_ONLYSPAWNPOS) || (tmf.abovemidtex && (tmf.floorz <= actor->z)))
+	if (!(flags & FFCF_ONLYSPAWNPOS) || (tmf.abovemidtex && (tmf.floorz <= actor->Z())))
 	{
 		actor->floorz = tmf.floorz;
 		actor->dropoffz = tmf.dropoffz;
@@ -404,13 +404,13 @@ bool P_TeleportMove(AActor *thing, fixed_t x, fixed_t y, fixed_t z, bool telefra
 	line_t *ld;
 
 	// P_LineOpening requires the thing's z to be the destination z in order to work.
-	fixed_t savedz = thing->z;
-	thing->z = z;
+	fixed_t savedz = thing->Z();
+	thing->SetZ(z);
 	while ((ld = it.Next()))
 	{
 		PIT_FindFloorCeiling(ld, box, tmf, 0);
 	}
-	thing->z = savedz;
+	thing->SetZ(savedz);
 
 	if (tmf.touchmidtex) tmf.dropoffz = tmf.floorz;
 
@@ -427,7 +427,7 @@ bool P_TeleportMove(AActor *thing, fixed_t x, fixed_t y, fixed_t z, bool telefra
 			continue;
 
 		fixed_t blockdist = th->radius + tmf.thing->radius;
-		if (abs(th->x - tmf.x) >= blockdist || abs(th->y - tmf.y) >= blockdist)
+		if (abs(th->X() - tmf.x) >= blockdist || abs(th->Y() - tmf.y) >= blockdist)
 			continue;
 
 		// [RH] Z-Check
@@ -437,8 +437,8 @@ bool P_TeleportMove(AActor *thing, fixed_t x, fixed_t y, fixed_t z, bool telefra
 		{
 			if (!(th->flags3 & thing->flags3 & MF3_DONTOVERLAP))
 			{
-				if (z > th->z + th->height ||	// overhead
-					z + thing->height < th->z)	// underneath
+				if (z > th->Top() ||	// overhead
+					z + thing->height < th->Z())	// underneath
 					continue;
 			}
 		}
@@ -459,7 +459,7 @@ bool P_TeleportMove(AActor *thing, fixed_t x, fixed_t y, fixed_t z, bool telefra
 	if (modifyactor)
 	{
 		// the move is ok, so link the thing into its new position
-		thing->SetOrigin(x, y, z);
+		thing->SetOrigin(x, y, z, false);
 		thing->floorz = tmf.floorz;
 		thing->ceilingz = tmf.ceilingz;
 		thing->floorsector = tmf.floorsector;
@@ -507,7 +507,7 @@ bool P_TeleportMove(AActor *thing, fixed_t x, fixed_t y, fixed_t z, bool telefra
 void P_PlayerStartStomp(AActor *actor)
 {
 	AActor *th;
-	FBlockThingsIterator it(FBoundingBox(actor->x, actor->y, actor->radius));
+	FBlockThingsIterator it(FBoundingBox(actor->X(), actor->Y(), actor->radius));
 
 	while ((th = it.Next()))
 	{
@@ -525,9 +525,9 @@ void P_PlayerStartStomp(AActor *actor)
 		if (th->player == NULL && !(th->flags3 & MF3_ISMONSTER))
 			continue;
 
-		if (actor->z > th->z + th->height)
+		if (actor->Z() > th->Top())
 			continue;        // overhead
-		if (actor->z + actor->height < th->z)
+		if (actor->Top() < th->Z())
 			continue;        // underneath
 
 		P_DamageMobj(th, actor, actor, TELEFRAG_DAMAGE, NAME_Telefrag);

src/p_things.cpp

@@ -82,7 +82,7 @@ bool P_Thing_Spawn (int tid, AActor *source, int type, angle_t angle, bool fog,
 	}
 	while (spot != NULL)
 	{
-		mobj = Spawn (kind, spot->X(), spot->Y(), spot->Z(), ALLOW_REPLACE);
+		mobj = Spawn (kind, spot->Pos(), ALLOW_REPLACE);
 
 		if (mobj != NULL)
 		{
@@ -123,11 +123,11 @@ bool P_MoveThing(AActor *source, fixed_t x, fixed_t y, fixed_t z, bool fog)
 {
 	fixed_t oldx, oldy, oldz;
 
-	oldx = source->x;
-	oldy = source->y;
-	oldz = source->z;
+	oldx = source->X();
+	oldy = source->Y();
+	oldz = source->Z();
 
-	source->SetOrigin (x, y, z);
+	source->SetOrigin (x, y, z, false);
 	if (P_TestMobjLocation (source))
 	{
 		if (fog)
@@ -146,7 +146,7 @@ bool P_MoveThing(AActor *source, fixed_t x, fixed_t y, fixed_t z, bool fog)
 	}
 	else
 	{
-		source->SetOrigin (oldx, oldy, oldz);
+		source->SetOrigin (oldx, oldy, oldz, false);
 		return false;
 	}
 }
@@ -218,7 +218,7 @@ bool P_Thing_Projectile (int tid, AActor *source, int type, const char *type_nam
 		{
 			do
 			{
-				fixed_t z = spot->z;
+				fixed_t z = spot->Z();
 				if (defflags3 & MF3_FLOORHUGGER)
 				{
 					z = ONFLOORZ;
@@ -231,7 +231,7 @@ bool P_Thing_Projectile (int tid, AActor *source, int type, const char *type_nam
 				{
 					z -= spot->floorclip;
 				}
-				mobj = Spawn (kind, spot->x, spot->y, z, ALLOW_REPLACE);
+				mobj = Spawn (kind, spot->X(), spot->Y(), z, ALLOW_REPLACE);
 
 				if (mobj)
 				{
@@ -254,8 +254,9 @@ bool P_Thing_Projectile (int tid, AActor *source, int type, const char *type_nam
 
 					if (targ != NULL)
 					{
-						fixed_t spot[3] = { targ->x, targ->y, targ->z+targ->height/2 };
-						FVector3 aim(float(spot[0] - mobj->x), float(spot[1] - mobj->y), float(spot[2] - mobj->z));
+						fixedvec3 vect = mobj->Vec3To(targ);
+						vect.z += targ->height / 2;
+						FVector3 aim = vect;
 
 						if (leadTarget && speed > 0 && (targ->velx | targ->vely | targ->velz))
 						{
@@ -435,7 +436,7 @@ bool P_Thing_Raise(AActor *thing, AActor *raiser)
 	thing->flags |= MF_SOLID;
 	thing->height = info->height;	// [RH] Use real height
 	thing->radius = info->radius;	// [RH] Use real radius
-	if (!P_CheckPosition (thing, thing->x, thing->y))
+	if (!P_CheckPosition (thing, thing->Pos()))
 	{
 		thing->flags = oldflags;
 		thing->radius = oldradius;
@@ -477,7 +478,7 @@ bool P_Thing_CanRaise(AActor *thing)
 	thing->height = info->height;
 	thing->radius = info->radius;
 
-	bool check = P_CheckPosition (thing, thing->x, thing->y);
+	bool check = P_CheckPosition (thing, thing->Pos());
 
 	// Restore checked properties
 	thing->flags = oldflags;
@@ -690,8 +691,8 @@ int P_Thing_Warp(AActor *caller, AActor *reference, fixed_t xofs, fixed_t yofs,
 		caller = temp;
 	}
 
-	fixed_t	oldx = caller->x;
-	fixed_t	oldy = caller->y;
+	fixed_t	oldx = caller->X();
+	fixed_t	oldy = caller->Y();
 	fixed_t	oldz = caller->z;
 	zofs += FixedMul(reference->height, heightoffset);
 	

src/p_writemap.cpp

@@ -98,8 +98,8 @@ static int WriteTHINGS (FILE *file)
 	mapthinghexen_t mt = { 0, 0, 0, 0, 0, 0, 0, 0, {0} };
 	AActor *mo = players[consoleplayer].mo;
 
-	mt.x = LittleShort(short(mo->x >> FRACBITS));
-	mt.y = LittleShort(short(mo->y >> FRACBITS));
+	mt.x = LittleShort(short(mo->X() >> FRACBITS));
+	mt.y = LittleShort(short(mo->Y() >> FRACBITS));
 	mt.angle = LittleShort(short(MulScale32 (mo->angle >> ANGLETOFINESHIFT, 360)));
 	mt.type = LittleShort((short)1);
 	mt.flags = LittleShort((short)(7|224|MTF_SINGLE));

src/r_defs.h

@@ -455,6 +455,11 @@ struct secspecial_t
 	short leakydamage;		// chance of leaking through radiation suit
 	int Flags;
 
+	secspecial_t()
+	{
+		Clear();
+	}
+
 	void Clear()
 	{
 		memset(this, 0, sizeof(*this));
@@ -678,6 +683,17 @@ struct sector_t
 		return pos == floor? floorplane:ceilingplane;
 	}
 
+	fixed_t HighestCeiling(AActor *a) const
+	{
+		return ceilingplane.ZatPoint(a);
+	}
+
+	fixed_t LowestFloor(AActor *a) const
+	{
+		return floorplane.ZatPoint(a);
+	}
+
+
 	bool isSecret() const
 	{
 		return !!(Flags & SECF_SECRET);
@@ -972,6 +988,11 @@ struct line_t
 	sector_t	*frontsector, *backsector;
 	int 		validcount;	// if == validcount, already checked
 	int			locknumber;	// [Dusk] lock number for special
+
+	bool isLinePortal() const
+	{
+		return false;
+	}
 };
 
 // phares 3/14/98

src/r_plane.cpp

@@ -1224,9 +1224,10 @@ void R_DrawSkyBoxes ()
 			extralight = 0;
 			R_SetVisibility (sky->args[0] * 0.25f);
 
-			viewx = sky->PrevX + FixedMul(r_TicFrac, sky->x - sky->PrevX);
-			viewy = sky->PrevY + FixedMul(r_TicFrac, sky->y - sky->PrevY);
-			viewz = sky->PrevZ + FixedMul(r_TicFrac, sky->z - sky->PrevZ);
+			fixedvec3 viewpos = sky->InterpolatedPosition(r_TicFrac);
+			viewx = viewpos.x;
+			viewy = viewpos.y;
+			viewz = viewpos.z;
 			viewangle = savedangle + sky->PrevAngle + FixedMul(r_TicFrac, sky->angle - sky->PrevAngle);
 
 			R_CopyStackedViewParameters();
@@ -1235,8 +1236,8 @@ void R_DrawSkyBoxes ()
 		{
 			extralight = pl->extralight;
 			R_SetVisibility (pl->visibility);
-			viewx = pl->viewx - sky->Mate->x + sky->x;
-			viewy = pl->viewy - sky->Mate->y + sky->y;
+			viewx = pl->viewx - sky->Mate->X() + sky->X();
+			viewy = pl->viewy - sky->Mate->Y() + sky->Y();
 			viewz = pl->viewz;
 			viewangle = pl->viewangle;
 		}

src/r_things.cpp

@@ -677,9 +677,10 @@ void R_ProjectSprite (AActor *thing, int fakeside, F3DFloor *fakefloor, F3DFloor
 	}
 
 	// [RH] Interpolate the sprite's position to make it look smooth
-	fx = thing->PrevX + FixedMul (r_TicFrac, thing->x - thing->PrevX);
-	fy = thing->PrevY + FixedMul (r_TicFrac, thing->y - thing->PrevY);
-	fz = thing->PrevZ + FixedMul (r_TicFrac, thing->z - thing->PrevZ) + thing->GetBobOffset(r_TicFrac);
+	fixedvec3 pos = thing->InterpolatedPosition(r_TicFrac);
+	fx = pos.x;
+	fy = pos.y;
+	fz = pos.z +thing->GetBobOffset(r_TicFrac);
 
 	tex = NULL;
 	voxel = NULL;
@@ -1152,12 +1153,12 @@ void R_AddSprites (sector_t *sec, int lightlevel, int fakeside)
 			{
 				if(!(rover->top.plane->a) && !(rover->top.plane->b))
 				{
-					if(rover->top.plane->Zat0() <= thing->z) fakefloor = rover;
+					if(rover->top.plane->Zat0() <= thing->Z()) fakefloor = rover;
 				}
 			}
 			if(!(rover->bottom.plane->a) && !(rover->bottom.plane->b))
 			{
-				if(rover->bottom.plane->Zat0() >= thing->z + thing->height) fakeceiling = rover;
+				if(rover->bottom.plane->Zat0() >= thing->Top()) fakeceiling = rover;
 			}
 		}	
 		R_ProjectSprite (thing, fakeside, fakefloor, fakeceiling);

src/r_utility.cpp

@@ -587,8 +587,8 @@ void R_InterpolateView (player_t *player, fixed_t frac, InterpolationViewer *ivi
 		player - players == consoleplayer &&
 		camera == player->mo &&
 		!demoplayback &&
-		iview->nviewx == camera->x &&
-		iview->nviewy == camera->y && 
+		iview->nviewx == camera->X() &&
+		iview->nviewy == camera->Y() && 
 		!(player->cheats & (CF_TOTALLYFROZEN|CF_FROZEN)) &&
 		player->playerstate == PST_LIVE &&
 		player->mo->reactiontime == 0 &&
@@ -839,9 +839,9 @@ void R_SetupFrame (AActor *actor)
 	}
 	else
 	{
-		iview->nviewx = camera->x;
-		iview->nviewy = camera->y;
-		iview->nviewz = camera->player ? camera->player->viewz : camera->z + camera->GetCameraHeight();
+		iview->nviewx = camera->X();
+		iview->nviewy = camera->Y();
+		iview->nviewz = camera->player ? camera->player->viewz : camera->Z() + camera->GetCameraHeight();
 		viewsector = camera->Sector;
 		r_showviewer = false;
 	}