diff --git a/src/am_map.cpp b/src/am_map.cpp
index 606a65ae85..64d5420b0c 100644
--- a/src/am_map.cpp
+++ b/src/am_map.cpp
@@ -998,8 +998,8 @@ void AM_restoreScaleAndLoc ()
     }
 	else
 	{
-		m_x = (players[consoleplayer].camera->x >> FRACTOMAPBITS) - m_w/2;
-		m_y = (players[consoleplayer].camera->y >> FRACTOMAPBITS)- m_h/2;
+		m_x = (players[consoleplayer].camera->X() >> FRACTOMAPBITS) - m_w/2;
+		m_y = (players[consoleplayer].camera->Y() >> FRACTOMAPBITS)- m_h/2;
     }
 	m_x2 = m_x + m_w;
 	m_y2 = m_y + m_h;
@@ -1249,8 +1249,8 @@ void AM_initVariables ()
 			if (playeringame[pnum])
 				break;
 	assert(pnum >= 0 && pnum < MAXPLAYERS);
-	m_x = (players[pnum].camera->x >> FRACTOMAPBITS) - m_w/2;
-	m_y = (players[pnum].camera->y >> FRACTOMAPBITS) - m_h/2;
+	m_x = (players[pnum].camera->X() >> FRACTOMAPBITS) - m_w/2;
+	m_y = (players[pnum].camera->Y() >> FRACTOMAPBITS) - m_h/2;
 	AM_changeWindowLoc();
 
 	// for saving & restoring
@@ -1571,25 +1571,25 @@ void AM_doFollowPlayer ()
 	fixed_t sx, sy;
 
     if (players[consoleplayer].camera != NULL &&
-		(f_oldloc.x != players[consoleplayer].camera->x ||
-		 f_oldloc.y != players[consoleplayer].camera->y))
+		(f_oldloc.x != players[consoleplayer].camera->X() ||
+		 f_oldloc.y != players[consoleplayer].camera->Y()))
 	{
-		m_x = (players[consoleplayer].camera->x >> FRACTOMAPBITS) - m_w/2;
-		m_y = (players[consoleplayer].camera->y >> FRACTOMAPBITS) - m_h/2;
+		m_x = (players[consoleplayer].camera->X() >> FRACTOMAPBITS) - m_w/2;
+		m_y = (players[consoleplayer].camera->Y() >> FRACTOMAPBITS) - m_h/2;
 		m_x2 = m_x + m_w;
 		m_y2 = m_y + m_h;
 
   		// do the parallax parchment scrolling.
-		sx = (players[consoleplayer].camera->x - f_oldloc.x) >> FRACTOMAPBITS;
-		sy = (f_oldloc.y - players[consoleplayer].camera->y) >> FRACTOMAPBITS;
+		sx = (players[consoleplayer].camera->X() - f_oldloc.x) >> FRACTOMAPBITS;
+		sy = (f_oldloc.y - players[consoleplayer].camera->Y()) >> FRACTOMAPBITS;
 		if (am_rotate == 1 || (am_rotate == 2 && viewactive))
 		{
 			AM_rotate (&sx, &sy, players[consoleplayer].camera->angle - ANG90);
 		}
 		AM_ScrollParchment (sx, sy);
 
-		f_oldloc.x = players[consoleplayer].camera->x;
-		f_oldloc.y = players[consoleplayer].camera->y;
+		f_oldloc.x = players[consoleplayer].camera->X();
+		f_oldloc.y = players[consoleplayer].camera->Y();
 	}
 }
 
@@ -2612,8 +2612,8 @@ void AM_drawPlayers ()
 		mline_t *arrow;
 		int numarrowlines;
 
-		pt.x = players[consoleplayer].camera->x >> FRACTOMAPBITS;
-		pt.y = players[consoleplayer].camera->y >> FRACTOMAPBITS;
+		pt.x = players[consoleplayer].camera->X() >> FRACTOMAPBITS;
+		pt.y = players[consoleplayer].camera->Y() >> FRACTOMAPBITS;
 		if (am_rotate == 1 || (am_rotate == 2 && viewactive))
 		{
 			angle = ANG90;
@@ -2675,8 +2675,8 @@ void AM_drawPlayers ()
 
 		if (p->mo != NULL)
 		{
-			pt.x = p->mo->x >> FRACTOMAPBITS;
-			pt.y = p->mo->y >> FRACTOMAPBITS;
+			pt.x = p->mo->X() >> FRACTOMAPBITS;
+			pt.y = p->mo->Y() >> FRACTOMAPBITS;
 			angle = p->mo->angle;
 
 			if (am_rotate == 1 || (am_rotate == 2 && viewactive))
@@ -2707,8 +2707,8 @@ void AM_drawKeys ()
 
 	while ((key = it.Next()) != NULL)
 	{
-		p.x = key->x >> FRACTOMAPBITS;
-		p.y = key->y >> FRACTOMAPBITS;
+		p.x = key->X() >> FRACTOMAPBITS;
+		p.y = key->Y() >> FRACTOMAPBITS;
 		angle = key->angle;
 
 		if (am_rotate == 1 || (am_rotate == 2 && viewactive))
@@ -2752,8 +2752,8 @@ void AM_drawThings ()
 		{
 			if (am_cheat > 0 || !(t->flags6 & MF6_NOTONAUTOMAP))
 			{
-				p.x = t->x >> FRACTOMAPBITS;
-				p.y = t->y >> FRACTOMAPBITS;
+				p.x = t->X() >> FRACTOMAPBITS;
+				p.y = t->Y() >> FRACTOMAPBITS;
 
 				if (am_showthingsprites > 0 && t->sprite > 0)
 				{
@@ -2979,7 +2979,7 @@ void AM_drawAuthorMarkers ()
 				 marked->subsector->flags & SSECF_DRAWN :
 				 marked->Sector->MoreFlags & SECF_DRAWN)))
 			{
-				DrawMarker (tex, marked->x >> FRACTOMAPBITS, marked->y >> FRACTOMAPBITS, 0,
+				DrawMarker (tex, marked->X() >> FRACTOMAPBITS, marked->Y() >> FRACTOMAPBITS, 0,
 					flip, mark->scaleX, mark->scaleY, mark->Translation,
 					mark->alpha, mark->fillcolor, mark->RenderStyle);
 			}
diff --git a/src/b_func.cpp b/src/b_func.cpp
index 9594d29d8b..79518e82f9 100644
--- a/src/b_func.cpp
+++ b/src/b_func.cpp
@@ -30,17 +30,17 @@ bool DBot::Reachable (AActor *rtarget)
 	if (player->mo == rtarget)
 		return false;
 
-	if ((rtarget->Sector->ceilingplane.ZatPoint (rtarget->x, rtarget->y) -
-		 rtarget->Sector->floorplane.ZatPoint (rtarget->x, rtarget->y))
+	if ((rtarget->Sector->ceilingplane.ZatPoint (rtarget) -
+		 rtarget->Sector->floorplane.ZatPoint (rtarget))
 		< player->mo->height) //Where rtarget is, player->mo can't be.
 		return false;
 
 	sector_t *last_s = player->mo->Sector;
-	fixed_t last_z = last_s->floorplane.ZatPoint (player->mo->x, player->mo->y);
+	fixed_t last_z = last_s->floorplane.ZatPoint (player->mo);
 	fixed_t estimated_dist = player->mo->AproxDistance(rtarget);
 	bool reachable = true;
 
-	FPathTraverse it(player->mo->x+player->mo->velx, player->mo->y+player->mo->vely, rtarget->x, rtarget->y, PT_ADDLINES|PT_ADDTHINGS);
+	FPathTraverse it(player->mo->X()+player->mo->velx, player->mo->Y()+player->mo->vely, rtarget->X(), rtarget->Y(), PT_ADDLINES|PT_ADDTHINGS);
 	intercept_t *in;
 	while ((in = it.Next()))
 	{
@@ -96,7 +96,7 @@ bool DBot::Reachable (AActor *rtarget)
 		thing = in->d.thing;
 		if (thing == player->mo) //Can't reach self in this case.
 			continue;
-		if (thing == rtarget && (rtarget->Sector->floorplane.ZatPoint (rtarget->x, rtarget->y) <= (last_z+MAXMOVEHEIGHT)))
+		if (thing == rtarget && (rtarget->Sector->floorplane.ZatPoint (rtarget) <= (last_z+MAXMOVEHEIGHT)))
 		{
 			return true;
 		}
@@ -219,7 +219,7 @@ void DBot::Dofire (ticcmd_t *cmd)
 shootmissile:
 		dist = player->mo->AproxDistance (enemy);
 		m = dist / GetDefaultByType (player->ReadyWeapon->ProjectileType)->Speed;
-		bglobal.SetBodyAt (enemy->x + enemy->velx*m*2, enemy->y + enemy->vely*m*2, enemy->z, 1);
+		bglobal.SetBodyAt (enemy->X() + enemy->velx*m*2, enemy->Y() + enemy->vely*m*2, enemy->Z(), 1);
 		angle = player->mo->AngleTo(bglobal.body1);
 		if (Check_LOS (enemy, SHOOTFOV))
 			no_fire = false;
@@ -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->X(), source->Y(), source->Z() + 4*8*FRACUNIT, NO_REPLACE);
 	
 	th->target = source;		// where it came from
 
@@ -494,9 +494,9 @@ angle_t DBot::FireRox (AActor *enemy, ticcmd_t *cmd)
 	AActor *actor;
 	int m;
 
-	bglobal.SetBodyAt (player->mo->x + FixedMul(player->mo->velx, 5*FRACUNIT),
-					   player->mo->y + FixedMul(player->mo->vely, 5*FRACUNIT),
-					   player->mo->z + (player->mo->height / 2), 2);
+	bglobal.SetBodyAt (player->mo->X() + FixedMul(player->mo->velx, 5*FRACUNIT),
+					   player->mo->Y() + FixedMul(player->mo->vely, 5*FRACUNIT),
+					   player->mo->Z() + (player->mo->height / 2), 2);
 
 	actor = bglobal.body2;
 
@@ -506,14 +506,14 @@ angle_t DBot::FireRox (AActor *enemy, ticcmd_t *cmd)
 	//Predict.
 	m = (((dist+1)/FRACUNIT) / GetDefaultByName("Rocket")->Speed);
 
-	bglobal.SetBodyAt (enemy->x + FixedMul(enemy->velx, (m+2*FRACUNIT)),
-					   enemy->y + FixedMul(enemy->vely, (m+2*FRACUNIT)), ONFLOORZ, 1);
+	bglobal.SetBodyAt (enemy->X() + FixedMul(enemy->velx, (m+2*FRACUNIT)),
+					   enemy->Y() + FixedMul(enemy->vely, (m+2*FRACUNIT)), ONFLOORZ, 1);
 	
 	//try the predicted location
 	if (P_CheckSight (actor, bglobal.body1, SF_IGNOREVISIBILITY)) //See the predicted location, so give a test missile
 	{
 		FCheckPosition tm;
-		if (bglobal.SafeCheckPosition (player->mo, actor->x, actor->y, tm))
+		if (bglobal.SafeCheckPosition (player->mo, actor->X(), actor->Y(), tm))
 		{
 			if (bglobal.FakeFire (actor, bglobal.body1, cmd) >= SAFE_SELF_MISDIST)
 			{
diff --git a/src/b_move.cpp b/src/b_move.cpp
index 5cacd56645..e0c49159e7 100644
--- a/src/b_move.cpp
+++ b/src/b_move.cpp
@@ -67,8 +67,8 @@ bool DBot::Move (ticcmd_t *cmd)
 	if ((unsigned)player->mo->movedir >= 8)
 		I_Error ("Weird bot movedir!");
 
-	tryx = player->mo->x + 8*xspeed[player->mo->movedir];
-	tryy = player->mo->y + 8*yspeed[player->mo->movedir];
+	tryx = player->mo->X() + 8*xspeed[player->mo->movedir];
+	tryy = player->mo->Y() + 8*yspeed[player->mo->movedir];
 
 	try_ok = bglobal.CleanAhead (player->mo, tryx, tryy, cmd);
 
@@ -282,7 +282,7 @@ bool FCajunMaster::CleanAhead (AActor *thing, fixed_t x, fixed_t y, ticcmd_t *cm
 
 
 	        if ( !(thing->flags & MF_TELEPORT) &&
-	             tm.ceilingz - thing->z < thing->height)
+	             tm.ceilingz - thing->Z() < thing->height)
 	            return false;       // mobj must lower itself to fit
 
 	        // jump out of water
@@ -290,7 +290,7 @@ bool FCajunMaster::CleanAhead (AActor *thing, fixed_t x, fixed_t y, ticcmd_t *cm
 //	            maxstep=37*FRACUNIT;
 
 	        if ( !(thing->flags & MF_TELEPORT) &&
-	             (tm.floorz - thing->z > maxstep ) )
+	             (tm.floorz - thing->Z() > maxstep ) )
 	            return false;       // too big a step up
 
 
@@ -346,7 +346,7 @@ void DBot::Pitch (AActor *target)
 	double aim;
 	double diff;
 
-	diff = target->z - player->mo->z;
+	diff = target->Z() - player->mo->Z();
 	aim = atan(diff / (double)player->mo->AproxDistance(target));
 	player->mo->pitch = -(int)(aim * ANGLE_180/M_PI);
 }
diff --git a/src/b_think.cpp b/src/b_think.cpp
index ced5b4b4e0..de74c04dbe 100644
--- a/src/b_think.cpp
+++ b/src/b_think.cpp
@@ -303,8 +303,8 @@ void DBot::ThinkForMove (ticcmd_t *cmd)
 	if (t_fight<(AFTERTICS/2))
 		player->mo->flags |= MF_DROPOFF;
 
-	oldx = player->mo->x;
-	oldy = player->mo->y;
+	oldx = player->mo->X();
+	oldy = player->mo->Y();
 }
 
 //BOT_WhatToGet
diff --git a/src/c_cmds.cpp b/src/c_cmds.cpp
index 57290a98ae..3cfbf1c650 100644
--- a/src/c_cmds.cpp
+++ b/src/c_cmds.cpp
@@ -944,7 +944,7 @@ static void PrintFilteredActorList(const ActorTypeChecker IsActorType, const cha
 		{
 			Printf ("%s at (%d,%d,%d)\n",
 				mo->GetClass()->TypeName.GetChars(),
-				mo->x >> FRACBITS, mo->y >> FRACBITS, mo->z >> FRACBITS);
+				mo->X() >> FRACBITS, mo->Y() >> FRACBITS, mo->Z() >> FRACBITS);
 		}
 	}
 }
@@ -1084,7 +1084,7 @@ CCMD(currentpos)
 {
 	AActor *mo = players[consoleplayer].mo;
 	Printf("Current player position: (%1.3f,%1.3f,%1.3f), angle: %1.3f, floorheight: %1.3f, sector:%d, lightlevel: %d\n",
-		FIXED2FLOAT(mo->x), FIXED2FLOAT(mo->y), FIXED2FLOAT(mo->z), mo->angle/float(ANGLE_1), FIXED2FLOAT(mo->floorz), mo->Sector->sectornum, mo->Sector->lightlevel);
+		FIXED2FLOAT(mo->X()), FIXED2FLOAT(mo->Y()), FIXED2FLOAT(mo->Z()), mo->angle/float(ANGLE_1), FIXED2FLOAT(mo->floorz), mo->Sector->sectornum, mo->Sector->lightlevel);
 }
 
 //-----------------------------------------------------------------------------
diff --git a/src/d_dehacked.cpp b/src/d_dehacked.cpp
index bc0acc6665..31ff05b649 100644
--- a/src/d_dehacked.cpp
+++ b/src/d_dehacked.cpp
@@ -3056,7 +3056,7 @@ bool ADehackedPickup::TryPickup (AActor *&toucher)
 	{
 		return false;
 	}
-	RealPickup = static_cast<AInventory *>(Spawn (type, x, y, z, NO_REPLACE));
+	RealPickup = static_cast<AInventory *>(Spawn (type, X(), Y(), Z(), NO_REPLACE));
 	if (RealPickup != NULL)
 	{
 		// The internally spawned item should never count towards statistics.
diff --git a/src/d_net.cpp b/src/d_net.cpp
index 780b893827..2b7a2d3d9f 100644
--- a/src/d_net.cpp
+++ b/src/d_net.cpp
@@ -2373,8 +2373,8 @@ 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),
+			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->Sector,
 				vx, vy, vz, 172*FRACUNIT, 0, ML_BLOCKEVERYTHING, players[player].mo,
 				trace, TRACE_NoSky))
diff --git a/src/g_game.cpp b/src/g_game.cpp
index b7d10251b5..aa2ba0ab87 100644
--- a/src/g_game.cpp
+++ b/src/g_game.cpp
@@ -1176,7 +1176,7 @@ void G_Ticker ()
 				}
 				if (players[i].mo)
 				{
-					DWORD sum = rngsum + players[i].mo->x + players[i].mo->y + players[i].mo->z
+					DWORD sum = rngsum + players[i].mo->X() + players[i].mo->Y() + players[i].mo->Z()
 						+ players[i].mo->angle + players[i].mo->pitch;
 					sum ^= players[i].health;
 					consistancy[i][buf] = sum;
@@ -1435,12 +1435,12 @@ bool G_CheckSpot (int playernum, FPlayerStart *mthing)
 	if (!players[playernum].mo)
 	{ // first spawn of level, before corpses
 		for (i = 0; i < playernum; i++)
-			if (players[i].mo && players[i].mo->x == x && players[i].mo->y == y)
+			if (players[i].mo && players[i].mo->X() == x && players[i].mo->Y() == y)
 				return false;
 		return true;
 	}
 
-	oldz = players[playernum].mo->z;	// [RH] Need to save corpse's z-height
+	oldz = players[playernum].mo->Z();	// [RH] Need to save corpse's z-height
 	players[playernum].mo->z = z;		// [RH] Checks are now full 3-D
 
 	// killough 4/2/98: fix bug where P_CheckPosition() uses a non-solid
diff --git a/src/m_cheat.cpp b/src/m_cheat.cpp
index ab9c0aee71..3bab8f7e5e 100644
--- a/src/m_cheat.cpp
+++ b/src/m_cheat.cpp
@@ -580,7 +580,7 @@ void GiveSpawner (player_t *player, const PClass *type, int amount)
 	}
 
 	AInventory *item = static_cast<AInventory *>
-		(Spawn (type, player->mo->x, player->mo->y, player->mo->z, NO_REPLACE));
+		(Spawn (type, player->mo->X(), player->mo->Y(), player->mo->Z(), NO_REPLACE));
 	if (item != NULL)
 	{
 		if (amount > 0)
diff --git a/src/p_3dfloors.cpp b/src/p_3dfloors.cpp
index 496809fac6..a9af52724e 100644
--- a/src/p_3dfloors.cpp
+++ b/src/p_3dfloors.cpp
@@ -331,13 +331,13 @@ void P_PlayerOnSpecial3DFloor(player_t* player)
 		if(rover->flags & FF_SOLID)
 		{
 			// Player must be on top of the floor to be affected...
-			if(player->mo->z != rover->top.plane->ZatPoint(player->mo->x, player->mo->y)) continue;
+			if(player->mo->Z() != rover->top.plane->ZatPoint(player->mo)) continue;
 		}
 		else
 		{
 			//Water and DEATH FOG!!! heh
-			if (player->mo->z > rover->top.plane->ZatPoint(player->mo->x, player->mo->y) || 
-				(player->mo->z + player->mo->height) < rover->bottom.plane->ZatPoint(player->mo->x, player->mo->y))
+			if (player->mo->Z() > rover->top.plane->ZatPoint(player->mo) || 
+				(player->mo->Z() + player->mo->height) < rover->bottom.plane->ZatPoint(player->mo))
 				continue;
 		}
 
@@ -372,7 +372,7 @@ bool P_CheckFor3DFloorHit(AActor * mo)
 
 		if(rover->flags & FF_SOLID && rover->model->SecActTarget)
 		{
-			if(mo->floorz == rover->top.plane->ZatPoint(mo->x, mo->y)) 
+			if(mo->floorz == rover->top.plane->ZatPoint(mo)) 
 			{
 				rover->model->SecActTarget->TriggerAction (mo, SECSPAC_HitFloor);
 				return true;
@@ -402,7 +402,7 @@ bool P_CheckFor3DCeilingHit(AActor * mo)
 
 		if(rover->flags & FF_SOLID && rover->model->SecActTarget)
 		{
-			if(mo->ceilingz == rover->bottom.plane->ZatPoint(mo->x, mo->y)) 
+			if(mo->ceilingz == rover->bottom.plane->ZatPoint(mo)) 
 			{
 				rover->model->SecActTarget->TriggerAction (mo, SECSPAC_HitCeiling);
 				return true;
@@ -748,7 +748,7 @@ void P_LineOpening_XFloors (FLineOpening &open, AActor * thing, const line_t *li
     {
 		fixed_t thingbot, thingtop;
 		
-		thingbot = thing->z;
+		thingbot = thing->Z();
 		thingtop = thingbot + (thing->height==0? 1:thing->height);
 
 		extsector_t::xfloor *xf[2] = {&linedef->frontsector->e->XFloor, &linedef->backsector->e->XFloor};
@@ -789,7 +789,7 @@ void P_LineOpening_XFloors (FLineOpening &open, AActor * thing, const line_t *li
 						lowestceilingpic = *rover->bottom.texture;
 					}
 					
-					if(ff_top > highestfloor && delta1 < delta2 && (!restrict || thing->z >= ff_top))
+					if(ff_top > highestfloor && delta1 < delta2 && (!restrict || thing->Z() >= ff_top))
 					{
 						highestfloor = ff_top;
 						highestfloorpic = *rover->top.texture;
diff --git a/src/p_3dmidtex.cpp b/src/p_3dmidtex.cpp
index dbca50d105..3338956f32 100644
--- a/src/p_3dmidtex.cpp
+++ b/src/p_3dmidtex.cpp
@@ -276,7 +276,7 @@ bool P_LineOpening_3dMidtex(AActor *thing, const line_t *linedef, FLineOpening &
 	open.abovemidtex = false;
 	if (P_GetMidTexturePosition(linedef, 0, &tt, &tb))
 	{
-		if (thing->z + (thing->height/2) < (tt + tb)/2)
+		if (thing->Z() + (thing->height/2) < (tt + tb)/2)
 		{
 			if (tb < open.top)
 			{
@@ -286,7 +286,7 @@ bool P_LineOpening_3dMidtex(AActor *thing, const line_t *linedef, FLineOpening &
 		}
 		else
 		{
-			if (tt > open.bottom && (!restrict || thing->z >= tt))
+			if (tt > open.bottom && (!restrict || thing->Z() >= tt))
 			{
 				open.bottom = tt;
 				open.abovemidtex = true;
@@ -295,7 +295,7 @@ bool P_LineOpening_3dMidtex(AActor *thing, const line_t *linedef, FLineOpening &
 				
 			}
 			// returns true if it touches the midtexture
-			return (abs(thing->z - tt) <= thing->MaxStepHeight);
+			return (abs(thing->Z() - tt) <= thing->MaxStepHeight);
 		}
 	}
 	return false;
diff --git a/src/p_acs.cpp b/src/p_acs.cpp
index 6f136d98b7..8c8c0a5f1e 100644
--- a/src/p_acs.cpp
+++ b/src/p_acs.cpp
@@ -3441,12 +3441,12 @@ int DLevelScript::DoSpawnSpot (int type, int spot, int tid, int angle, bool forc
 
 		while ( (aspot = iterator.Next ()) )
 		{
-			spawned += DoSpawn (type, aspot->x, aspot->y, aspot->z, tid, angle, force);
+			spawned += DoSpawn (type, aspot->X(), aspot->Y(), aspot->Z(), tid, angle, force);
 		}
 	}
 	else if (activator != NULL)
 	{
-			spawned += DoSpawn (type, activator->x, activator->y, activator->z, tid, angle, force);
+			spawned += DoSpawn (type, activator->X(), activator->Y(), activator->Z(), tid, angle, force);
 	}
 	return spawned;
 }
@@ -3462,12 +3462,12 @@ int DLevelScript::DoSpawnSpotFacing (int type, int spot, int tid, bool force)
 
 		while ( (aspot = iterator.Next ()) )
 		{
-			spawned += DoSpawn (type, aspot->x, aspot->y, aspot->z, tid, aspot->angle >> 24, force);
+			spawned += DoSpawn (type, aspot->X(), aspot->Y(), aspot->Z(), tid, aspot->angle >> 24, force);
 		}
 	}
 	else if (activator != NULL)
 	{
-			spawned += DoSpawn (type, activator->x, activator->y, activator->z, tid, activator->angle >> 24, force);
+			spawned += DoSpawn (type, activator->X(), activator->Y(), activator->Z(), tid, activator->angle >> 24, force);
 	}
 	return spawned;
 }
@@ -4145,7 +4145,7 @@ bool DLevelScript::DoCheckActorTexture(int tid, AActor *activator, int string, b
 			F3DFloor *ff = sec->e->XFloor.ffloors[i];
 
 			if ((ff->flags & (FF_EXISTS | FF_SOLID)) == (FF_EXISTS | FF_SOLID) &&
-				actor->z >= ff->top.plane->ZatPoint(actor->x, actor->y))
+				actor->Z() >= ff->top.plane->ZatPoint(actor))
 			{ // This floor is beneath our feet.
 				secpic = *ff->top.texture;
 				break;
@@ -4158,14 +4158,14 @@ bool DLevelScript::DoCheckActorTexture(int tid, AActor *activator, int string, b
 	}
 	else
 	{
-		fixed_t z = actor->z + actor->height;
+		fixed_t z = actor->Z() + actor->height;
 		// Looking through planes from bottom to top
 		for (i = numff-1; i >= 0; --i)
 		{
 			F3DFloor *ff = sec->e->XFloor.ffloors[i];
 
 			if ((ff->flags & (FF_EXISTS | FF_SOLID)) == (FF_EXISTS | FF_SOLID) &&
-				z <= ff->bottom.plane->ZatPoint(actor->x, actor->y))
+				z <= ff->bottom.plane->ZatPoint(actor))
 			{ // This floor is above our eyes.
 				secpic = *ff->bottom.texture;
 				break;
@@ -4728,8 +4728,8 @@ static bool DoSpawnDecal(AActor *actor, const FDecalTemplate *tpl, int flags, an
 	{
 		angle += actor->angle;
 	}
-	return NULL != ShootDecal(tpl, actor, actor->Sector, actor->x, actor->y,
-		actor->z + (actor->height>>1) - actor->floorclip + actor->GetBobOffset() + zofs,
+	return NULL != ShootDecal(tpl, actor, actor->Sector, actor->X(), actor->Y(),
+		actor->Z() + (actor->height>>1) - actor->floorclip + actor->GetBobOffset() + zofs,
 		angle, distance, !!(flags & SDF_PERMANENT));
 }
 
@@ -8598,7 +8598,7 @@ scriptwait:
 				}
 				else if (pcd == PCD_GETACTORZ)
 				{
-					STACK(1) = actor->z + actor->GetBobOffset();
+					STACK(1) = actor->Z() + actor->GetBobOffset();
 				}
 				else
 				{
diff --git a/src/p_effect.cpp b/src/p_effect.cpp
index db31295219..0f04de8eb2 100644
--- a/src/p_effect.cpp
+++ b/src/p_effect.cpp
@@ -619,8 +619,8 @@ void P_DrawRailTrail(AActor *source, const TVector3<double> &start, const TVecto
 			double r;
 			double dirz;
 
-			if (abs(mo->x - FLOAT2FIXED(start.X)) < 20 * FRACUNIT
-				&& (mo->y - FLOAT2FIXED(start.Y)) < 20 * FRACUNIT)
+			if (abs(mo->X() - FLOAT2FIXED(start.X)) < 20 * FRACUNIT
+				&& (mo->Y() - FLOAT2FIXED(start.Y)) < 20 * FRACUNIT)
 			{ // This player (probably) fired the railgun
 				S_Sound (mo, CHAN_WEAPON, sound, 1, ATTN_NORM);
 			}
@@ -630,7 +630,7 @@ void P_DrawRailTrail(AActor *source, const TVector3<double> &start, const TVecto
 				// Only consider sound in 2D (for now, anyway)
 				// [BB] You have to divide by lengthsquared here, not multiply with it.
 
-				r = ((start.Y - FIXED2DBL(mo->y)) * (-dir.Y) - (start.X - FIXED2DBL(mo->x)) * (dir.X)) / lengthsquared;
+				r = ((start.Y - FIXED2DBL(mo->Y())) * (-dir.Y) - (start.X - FIXED2DBL(mo->X())) * (dir.X)) / lengthsquared;
 				r = clamp<double>(r, 0., 1.);
 
 				dirz = dir.Z;
diff --git a/src/p_enemy.cpp b/src/p_enemy.cpp
index 7b7e27b2e3..165ac35a1d 100644
--- a/src/p_enemy.cpp
+++ b/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() > z + height)
 			return false;
-		if (pl->z + pl->height < z)
+		if (pl->Z() + pl->height < 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->Z()+actor->height)
 	{ // Target is higher than the attacker
 		return false;
 	}
-	else if (actor->z > mo->z+mo->height)
+	else if (actor->Z() > mo->Z()+mo->height)
 	{ // Attacker is higher
 		return false;
 	}
@@ -434,7 +434,7 @@ bool P_Move (AActor *actor)
 	// it difficult to thrust them vertically in a reasonable manner.
 	// [GZ] Let jumping actors jump.
 	if (!((actor->flags & MF_NOGRAVITY) || (actor->flags6 & MF6_CANJUMP))
-		&& actor->z > actor->floorz && !(actor->flags2 & MF2_ONMOBJ))
+		&& actor->Z() > actor->floorz && !(actor->flags2 & MF2_ONMOBJ))
 	{
 		return false;
 	}
@@ -538,11 +538,11 @@ bool P_Move (AActor *actor)
 	// actually walking down a step.
 	if (try_ok &&
 		!((actor->flags & MF_NOGRAVITY) || (actor->flags6 & MF6_CANJUMP))
-		&& actor->z > actor->floorz && !(actor->flags2 & MF2_ONMOBJ))
+		&& actor->Z() > actor->floorz && !(actor->flags2 & MF2_ONMOBJ))
 	{
-		if (actor->z <= actor->floorz + actor->MaxStepHeight)
+		if (actor->Y() <= actor->floorz + actor->MaxStepHeight)
 		{
-			fixed_t savedz = actor->z;
+			fixed_t savedz = actor->Z();
 			actor->z = 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.
@@ -553,7 +553,7 @@ bool P_Move (AActor *actor)
 			else
 			{ // The monster just hit the floor, so trigger any actions.
 				if (actor->floorsector->SecActTarget != NULL &&
-					actor->floorz == actor->floorsector->floorplane.ZatPoint(actor->x, actor->y))
+					actor->floorz == actor->floorsector->floorplane.ZatPoint(actor))
 				{
 					actor->floorsector->SecActTarget->TriggerAction(actor, SECSPAC_HitFloor);
 				}
@@ -566,7 +566,7 @@ bool P_Move (AActor *actor)
 	{
 		if (((actor->flags6 & MF6_CANJUMP)||(actor->flags & MF_FLOAT)) && tm.floatok)
 		{ // must adjust height
-			fixed_t savedz = actor->z;
+			fixed_t savedz = actor->Z();
 
 			if (actor->z < tm.floorz)
 				actor->z += actor->FloatSpeed;
@@ -847,11 +847,11 @@ void P_NewChaseDir(AActor * actor)
 	
 	// Try to move away from a dropoff
 	if (actor->floorz - actor->dropoffz > actor->MaxDropOffHeight && 
-		actor->z <= actor->floorz && !(actor->flags & MF_DROPOFF) && 
+		actor->Z() <= actor->floorz && !(actor->flags & MF_DROPOFF) && 
 		!(actor->flags2 & MF2_ONMOBJ) &&
 		!(actor->flags & MF_FLOAT) && !(i_compatflags & COMPATF_DROPOFF))
 	{
-		FBoundingBox box(actor->x, actor->y, actor->radius);
+		FBoundingBox box(actor->X(), actor->Y(), actor->radius);
 		FBlockLinesIterator it(box);
 		line_t *line;
 
@@ -866,14 +866,14 @@ void P_NewChaseDir(AActor * actor)
 				box.Bottom() < line->bbox[BOXTOP]    &&
 				box.BoxOnLineSide(line) == -1)
 		    {
-				fixed_t front = line->frontsector->floorplane.ZatPoint(actor->x,actor->y);
-				fixed_t back  = line->backsector->floorplane.ZatPoint(actor->x,actor->y);
+				fixed_t front = line->frontsector->floorplane.ZatPoint(actor);
+				fixed_t back  = line->backsector->floorplane.ZatPoint(actor);
 				angle_t angle;
 		
 				// The monster must contact one of the two floors,
 				// and the other must be a tall dropoff.
 				
-				if (back == actor->z && front < actor->z - actor->MaxDropOffHeight)
+				if (back == actor->Z() && front < actor->Z() - actor->MaxDropOffHeight)
 				{
 					angle = R_PointToAngle2(0,0,line->dx,line->dy);   // front side dropoff
 				}
@@ -2551,11 +2551,11 @@ 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->X(), corpsehit->Y(), corpsehit->Z(), false, true, zdist1)
+						!= P_Find3DFloor(testsec, self->X(), self->Y(), self->Z(), false, true, zdist2))
 					{
 						// Not on same floor
-						if (vilesec == corpsec || abs(zdist1 - self->z) > self->height)
+						if (vilesec == corpsec || abs(zdist1 - self->Z()) > self->height)
 							continue;
 					}
 				}
@@ -2569,7 +2569,7 @@ 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->X(), corpsehit->Y());
 				corpsehit->flags = oldflags;
 				corpsehit->radius = oldradius;
 				corpsehit->height = oldheight;
@@ -2792,19 +2792,19 @@ void A_Face (AActor *self, AActor *other, angle_t max_turn, angle_t max_pitch, a
 
 		// 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->Z() + other->height)
 		{
-			target_z = other->z + (other->height / 2);
+			target_z = other->Z() + (other->height / 2);
 		}
 
 		//Note there is no +32*FRACUNIT on purpose. This is for customization sake. 
 		//If one doesn't want this behavior, just don't use FAF_BOTTOM.
 		if (flags & FAF_BOTTOM)
-			target_z = other->z + other->GetBobOffset(); 
+			target_z = other->Z() + other->GetBobOffset(); 
 		if (flags & FAF_MIDDLE)
-			target_z = other->z + (other->height / 2) + other->GetBobOffset();
+			target_z = other->Z() + (other->height / 2) + other->GetBobOffset();
 		if (flags & FAF_TOP)
-			target_z = other->z + (other->height) + other->GetBobOffset();
+			target_z = other->Z() + (other->height) + other->GetBobOffset();
 		if (!(flags & FAF_NODISTFACTOR))
 			target_z += pitch_offset;
 
@@ -3072,7 +3072,7 @@ AInventory *P_DropItem (AActor *source, const PClass *type, int dropamount, int
 		AActor *mo;
 		fixed_t spawnz;
 
-		spawnz = source->z;
+		spawnz = source->Z();
 		if (!(i_compatflags & COMPATF_NOTOSSDROPS))
 		{
 			int style = sv_dropstyle;
@@ -3087,7 +3087,7 @@ AInventory *P_DropItem (AActor *source, const PClass *type, int dropamount, int
 				spawnz += source->height / 2;
 			}
 		}
-		mo = Spawn (type, source->x, source->y, spawnz, ALLOW_REPLACE);
+		mo = Spawn (type, source->X(), source->Y(), spawnz, ALLOW_REPLACE);
 		if (mo != NULL)
 		{
 			mo->flags |= MF_DROPPED;
diff --git a/src/p_interaction.cpp b/src/p_interaction.cpp
index 5534fb14ab..0c61b2d7df 100644
--- a/src/p_interaction.cpp
+++ b/src/p_interaction.cpp
@@ -84,7 +84,7 @@ FName MeansOfDeath;
 //
 void P_TouchSpecialThing (AActor *special, AActor *toucher)
 {
-	fixed_t delta = special->z - toucher->z;
+	fixed_t delta = special->Z() - toucher->Z();
 
 	// The pickup is at or above the toucher's feet OR
 	// The pickup is below the toucher.
@@ -1158,7 +1158,7 @@ int P_DamageMobj (AActor *target, AActor *inflictor, AActor *source, int damage,
 			// If the origin and target are in exactly the same spot, choose a random direction.
 			// (Most likely cause is from telefragging somebody during spawning because they
 			// haven't moved from their spawn spot at all.)
-			if (origin->x == target->x && origin->y == target->y)
+			if (origin->X() == target->X() && origin->Y() == target->Y())
 			{
 				ang = pr_kickbackdir.GenRand32();
 			}
@@ -1184,7 +1184,7 @@ int P_DamageMobj (AActor *target, AActor *inflictor, AActor *source, int damage,
 
 			// make fall forwards sometimes
 			if ((damage < 40) && (damage > target->health)
-				 && (target->z - origin->z > 64*FRACUNIT)
+				 && (target->Z() - origin->Z() > 64*FRACUNIT)
 				 && (pr_damagemobj()&1)
 				 // [RH] But only if not too fast and not flying
 				 && thrust < 10*FRACUNIT
diff --git a/src/p_lnspec.cpp b/src/p_lnspec.cpp
index 53090ef186..22e901c73d 100644
--- a/src/p_lnspec.cpp
+++ b/src/p_lnspec.cpp
@@ -148,7 +148,7 @@ FUNC(LS_Polyobj_MoveToSpot)
 	FActorIterator iterator (arg2);
 	AActor *spot = iterator.Next();
 	if (spot == NULL) return false;
-	return EV_MovePolyTo (ln, arg0, SPEED(arg1), spot->x, spot->y, false);
+	return EV_MovePolyTo (ln, arg0, SPEED(arg1), spot->X(), spot->Y(), false);
 }
 
 FUNC(LS_Polyobj_DoorSwing)
@@ -199,7 +199,7 @@ FUNC(LS_Polyobj_OR_MoveToSpot)
 	FActorIterator iterator (arg2);
 	AActor *spot = iterator.Next();
 	if (spot == NULL) return false;
-	return EV_MovePolyTo (ln, arg0, SPEED(arg1), spot->x, spot->y, true);
+	return EV_MovePolyTo (ln, arg0, SPEED(arg1), spot->X(), spot->Y(), true);
 }
 
 FUNC(LS_Polyobj_Stop)
diff --git a/src/p_things.cpp b/src/p_things.cpp
index 631f1be5e8..e8f9d60114 100644
--- a/src/p_things.cpp
+++ b/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->X(), spot->Y(), spot->Z(), ALLOW_REPLACE);
 
 		if (mobj != NULL)
 		{
@@ -94,7 +94,7 @@ bool P_Thing_Spawn (int tid, AActor *source, int type, angle_t angle, bool fog,
 				mobj->angle = (angle != ANGLE_MAX ? angle : spot->angle);
 				if (fog)
 				{
-					P_SpawnTeleportFog(mobj, spot->x, spot->y, spot->z + TELEFOGHEIGHT, false, true);
+					P_SpawnTeleportFog(mobj, spot->X(), spot->Y(), spot->Z() + TELEFOGHEIGHT, false, true);
 				}
 				if (mobj->flags & MF_SPECIAL)
 					mobj->flags |= MF_DROPPED;	// Don't respawn
@@ -165,7 +165,7 @@ bool P_Thing_Move (int tid, AActor *source, int mapspot, bool fog)
 
 	if (source != NULL && target != NULL)
 	{
-		return P_MoveThing(source, target->x, target->y, target->z, fog);
+		return P_MoveThing(source, target->X(), target->Y(), target->Z(), fog);
 	}
 	return false;
 }
diff --git a/src/r_defs.h b/src/r_defs.h
index 05fd7bd036..6f69a26a01 100644
--- a/src/r_defs.h
+++ b/src/r_defs.h
@@ -248,6 +248,11 @@ struct secplane_t
 		return FixedMul (ic, -d - DMulScale16 (a, v->x, b, v->y));
 	}
 
+	fixed_t ZatPoint (const AActor *ac) const
+	{
+		return FixedMul (ic, -d - DMulScale16 (a, ac->X(), b, ac->Y()));
+	}
+
 	// Returns the value of z at (x,y) if d is equal to dist
 	fixed_t ZatPointDist (fixed_t x, fixed_t y, fixed_t dist) const
 	{