- floatified AActor::Prev plus the stuff using it.

- rewrote some coordinate functions in AActor to use real float math instead of converting back and forth between float and fixed.

src/actor.h

@@ -742,13 +742,13 @@ public:
 	// What species am I?
 	virtual FName GetSpecies();
 
-	double GetBobOffset(fixed_t ticfrac = 0) const
+	double GetBobOffset(double ticfrac = 0) const
 	{
 		if (!(flags2 & MF2_FLOATBOB))
 		{
 			return 0;
 		}
-		return BobSin(FloatBobPhase + level.maptime + FIXED2FLOAT(ticfrac));
+		return BobSin(FloatBobPhase + level.maptime + ticfrac);
 	}
 
 
@@ -850,8 +850,8 @@ public:
 	// more precise, but slower version, being used in a few places
 	double Distance2D(AActor *other, bool absolute = false)
 	{
-		fixedvec3 otherpos = absolute ? other->_f_Pos() : other->_f_PosRelative(this);
+		DVector2 otherpos = absolute ? other->Pos() : other->PosRelative(this);
-		return (DVector2(_f_X() - otherpos.x, _f_Y() - otherpos.y).Length())/FRACUNIT;
+		return (Pos().XY() - otherpos).Length();
 	}
 
 	double Distance2D(double x, double y) const
@@ -860,10 +860,10 @@ public:
 	}
 
 	// a full 3D version of the above
-	fixed_t Distance3D(AActor *other, bool absolute = false)
+	double Distance3D(AActor *other, bool absolute = false)
 	{
-		fixedvec3 otherpos = absolute ? other->_f_Pos() : other->_f_PosRelative(this);
+		DVector3 otherpos = absolute ? other->Pos() : other->PosRelative(this);
-		return xs_RoundToInt(DVector3(_f_X() - otherpos.x, _f_Y() - otherpos.y, _f_Z() - otherpos.z).Length());
+		return (Pos() - otherpos).Length();
 	}
 
 	angle_t __f_AngleTo(AActor *other, bool absolute = false)
@@ -879,19 +879,20 @@ public:
 
 	DAngle AngleTo(AActor *other, bool absolute = false)
 	{
-		fixedvec3 otherpos = absolute ? other->_f_Pos() : other->_f_PosRelative(this);
+		DVector2 otherpos = absolute ? other->Pos() : other->PosRelative(this);
-		return VecToAngle(otherpos.x - _f_X(), otherpos.y - _f_Y());
+		return VecToAngle(otherpos - Pos().XY());
 	}
 
 	DAngle AngleTo(AActor *other, fixed_t oxofs, fixed_t oyofs, bool absolute = false) const
 	{
 		fixedvec3 otherpos = absolute ? other->_f_Pos() : other->_f_PosRelative(this);
-		return VecToAngle(otherpos.y + oxofs - _f_Y(), otherpos.x + oyofs - _f_X());
+		return VecToAngle(otherpos.x + oxofs - _f_X(), otherpos.y + oyofs - _f_Y());
 	}
 
 	DAngle AngleTo(AActor *other, double oxofs, double oyofs, bool absolute = false) const
 	{
-		return FIXED2DBL(AngleTo(other, FLOAT2FIXED(oxofs), FLOAT2FIXED(oyofs), absolute));
+		DVector2 otherpos = absolute ? other->Pos() : other->PosRelative(this);
+		return VecToAngle(otherpos - Pos() + DVector2(oxofs, oyofs));
 	}
 
 	fixedvec2 _f_Vec2To(AActor *other) const
@@ -910,14 +911,12 @@ public:
 
 	DVector2 Vec2To(AActor *other) const
 	{
-		fixedvec3 otherpos = other->_f_PosRelative(this);
+		return other->PosRelative(this) - Pos();
-		return{ FIXED2DBL(otherpos.x - _f_X()), FIXED2DBL(otherpos.y - _f_Y()) };
 	}
 
 	DVector3 Vec3To(AActor *other) const
 	{
-		fixedvec3 otherpos = other->_f_PosRelative(this);
+		return other->PosRelative(this) - Pos();
-		return { FIXED2DBL(otherpos.x - _f_X()), FIXED2DBL(otherpos.y - _f_Y()), FIXED2DBL(otherpos.z - _f_Z()) };
 	}
 
 	fixedvec2 Vec2Offset(fixed_t dx, fixed_t dy, bool absolute = false)
@@ -1091,13 +1090,6 @@ public:
 	AActor			*snext, **sprev;	// links in sector (if needed)
 	DVector3		__Pos;		// double underscores so that it won't get used by accident. Access to this should be exclusively through the designated access functions.
 
-	/*
-	angle_t			angle;
-	fixed_t			pitch;
-	angle_t			roll;	// This was fixed_t before, which is probably wrong
-	fixedvec3		vel;
-	*/
-
 	DRotator		Angles;
 	DVector3		Vel;
 	double			Speed;
@@ -1321,8 +1313,7 @@ public:
 	FDecalBase *DecalGenerator;
 
 	// [RH] Used to interpolate the view to get >35 FPS
-	fixed_t PrevX, PrevY, PrevZ;
+	DVector3 Prev;
-	//angle_t PrevAngle;
 	DRotator PrevAngles;
 	int PrevPortalGroup;
 
@@ -1419,6 +1410,11 @@ public:
 	fixedvec3 _f_PosRelative(sector_t *sec) const;
 	fixedvec3 _f_PosRelative(line_t *line) const;
 
+	DVector3 PosRelative(int grp) const;
+	DVector3 PosRelative(const AActor *other) const;
+	DVector3 PosRelative(sector_t *sec) const;
+	DVector3 PosRelative(line_t *line) const;
+
 	fixed_t SoundX() const
 	{
 		return _f_X();
@@ -1431,14 +1427,9 @@ public:
 	{
 		return _f_Z();
 	}
-	fixedvec3 InterpolatedPosition(fixed_t ticFrac) const
+	DVector3 InterpolatedPosition(double ticFrac) const
 	{
-		fixedvec3 ret;
+		return Prev + (ticFrac * (Pos() - Prev));
-
-		ret.x = PrevX + FixedMul (ticFrac, _f_X() - PrevX);
-		ret.y = PrevY + FixedMul (ticFrac, _f_Y() - PrevY);
-		ret.z = PrevZ + FixedMul (ticFrac, _f_Z() - PrevZ);
-		return ret;
 	}
 	fixedvec3 PosPlusZ(fixed_t zadd) const
 	{
@@ -1480,7 +1471,7 @@ public:
 	void AddZ(double newz, bool moving = true)
 	{
 		__Pos.Z += newz;
-		if (!moving) PrevZ = _f_Z();
+		if (!moving) Prev.Z = Z();
 	}
 
 	// These are not for general use as they do not link the actor into the world!

src/am_map.cpp

@@ -2429,7 +2429,7 @@ void AM_drawWalls (bool allmap)
 			bool portalmode = numportalgroups > 0 &&  pg != MapPortalGroup;
 			if (pg == p)
 			{
-				offset = Displacements.getOffset(pg, MapPortalGroup);
+				offset = Displacements._f_getOffset(pg, MapPortalGroup);
 			}
 			else if (p == -1 && (pg == MapPortalGroup || !am_portaloverlay))
 			{

src/p_enemy.cpp

@@ -2545,8 +2545,7 @@ 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->_f_X();
+		DVector2 old = actor->Pos();
-		fixed_t oldY = actor->_f_Y();
 		int oldgroup = actor->PrevPortalGroup;
 		FTextureID oldFloor = actor->floorpic;
 
@@ -2559,12 +2558,12 @@ void A_DoChase (VMFrameStack *stack, AActor *actor, bool fastchase, FState *mele
 		// (copied from A_SerpentChase - it applies to everything with CANTLEAVEFLOORPIC!)
 		if (actor->flags2&MF2_CANTLEAVEFLOORPIC && actor->floorpic != oldFloor )
 		{
-			if (P_TryMove(actor, oldX, oldY, false))
+			if (P_TryMove(actor, old, false))
 			{
 				if (nomonsterinterpolation)
 				{
-					actor->PrevX = oldX;
+					actor->Prev.X = old.X;
-					actor->PrevY = oldY;
+					actor->Prev.Y = old.Y;
 					actor->PrevPortalGroup = oldgroup;
 				}
 			}

src/p_map.cpp

@@ -2299,8 +2299,8 @@ bool P_TryMove(AActor *thing, fixed_t x, fixed_t y,
 			{
 				thing->UnlinkFromWorld();
 				thing->SetXY(tm.x + port->mXDisplacement, tm.y + port->mYDisplacement);
-				thing->PrevX += port->mXDisplacement;
+				thing->Prev.X += FIXED2DBL(port->mXDisplacement);
-				thing->PrevY += port->mYDisplacement;
+				thing->Prev.Y += FIXED2DBL(port->mYDisplacement);
 				thing->LinkToWorld();
 				P_FindFloorCeiling(thing);
 				portalcrossed = true;

src/p_maputl.cpp

@@ -870,7 +870,7 @@ bool FMultiBlockLinesIterator::Next(FMultiBlockLinesIterator::CheckResult *item)
 
 void FMultiBlockLinesIterator::startIteratorForGroup(int group)
 {
-	offset = Displacements.getOffset(basegroup, group);
+	offset = Displacements._f_getOffset(basegroup, group);
 	offset.x += checkpoint.x;
 	offset.y += checkpoint.y;
 	cursector = group == startsector->PortalGroup ? startsector : P_PointInSector(offset.x, offset.y);
@@ -1104,7 +1104,7 @@ bool FMultiBlockThingsIterator::Next(FMultiBlockThingsIterator::CheckResult *ite
 	if (thing != NULL)
 	{
 		item->thing = thing;
-		item->position = checkpoint + Displacements.getOffset(basegroup, thing->Sector->PortalGroup);
+		item->position = checkpoint + Displacements._f_getOffset(basegroup, thing->Sector->PortalGroup);
 		item->portalflags = portalflags;
 
 		// same as above in floating point. This is here so that this stuff can be converted piece by piece.
@@ -1146,7 +1146,7 @@ bool FMultiBlockThingsIterator::Next(FMultiBlockThingsIterator::CheckResult *ite
 
 void FMultiBlockThingsIterator::startIteratorForGroup(int group)
 {
-	fixedvec2 offset = Displacements.getOffset(basegroup, group);
+	fixedvec2 offset = Displacements._f_getOffset(basegroup, group);
 	offset.x += checkpoint.x;
 	offset.y += checkpoint.y;
 	bbox.setBox(offset.x, offset.y, checkpoint.z);

src/p_mobj.cpp

@@ -2816,7 +2816,7 @@ void P_NightmareRespawn (AActor *mobj)
 
 	mo->skillrespawncount = mobj->skillrespawncount;
 
-	mo->PrevZ = FLOAT2FIXED(z);		// Do not interpolate Z position if we changed it since spawning.
+	mo->Prev.Z = z;		// Do not interpolate Z position if we changed it since spawning.
 
 	// spawn a teleport fog at old spot because of removal of the body?
 	P_SpawnTeleportFog(mobj, mobj->PosPlusZ(TELEFOGHEIGHT), true, true);
@@ -3294,13 +3294,11 @@ void AActor::CheckPortalTransition(bool islinked)
 		AActor *port = Sector->SkyBoxes[sector_t::ceiling];
 		if (Z() > port->specialf1)
 		{
-			fixedvec3 oldpos = _f_Pos();
+			DVector3 oldpos = Pos();
 			if (islinked && !moved) UnlinkFromWorld();
-			SetXYZ(_f_PosRelative(port->Sector));
+			SetXYZ(PosRelative(port->Sector));
-			PrevX += _f_X() - oldpos.x;
+			Prev = Pos() - oldpos;
-			PrevY += _f_Y() - oldpos.y;
+			Sector = P_PointInSector(Pos());
-			PrevZ += _f_Z() - oldpos.z;
-			Sector = P_PointInSector(_f_X(), _f_Y());
 			PrevPortalGroup = Sector->PortalGroup;
 			moved = true;
 		}
@@ -3313,13 +3311,11 @@ void AActor::CheckPortalTransition(bool islinked)
 			AActor *port = Sector->SkyBoxes[sector_t::floor];
 			if (Z() < port->specialf1 && floorz < port->specialf1)
 			{
-				fixedvec3 oldpos = _f_Pos();
+				DVector3 oldpos = Pos();
 				if (islinked && !moved) UnlinkFromWorld();
-				SetXYZ(_f_PosRelative(port->Sector));
+				SetXYZ(PosRelative(port->Sector));
-				PrevX += _f_X() - oldpos.x;
+				Prev = Pos() - oldpos;
-				PrevY += _f_Y() - oldpos.y;
+				Sector = P_PointInSector(Pos());
-				PrevZ += _f_Z() - oldpos.z;
-				Sector = P_PointInSector(_f_X(), _f_Y());
 				PrevPortalGroup = Sector->PortalGroup;
 				moved = true;
 			}

src/p_things.cpp

@@ -757,32 +757,26 @@ int P_Thing_Warp(AActor *caller, AActor *reference, double xofs, double yofs, do
 				caller->Vel.Zero();
 			}
 
-#if 0	// needs fixing
 			// this is no fun with line portals 
 			if (flags & WARPF_WARPINTERPOLATION)
 			{
 				// This just translates the movement but doesn't change the vector
-				fixedvec3 displacedold  = old + Displacements.getOffset(oldpgroup, caller->Sector->PortalGroup);
+				DVector3 displacedold  = old + Displacements.getOffset(oldpgroup, caller->Sector->PortalGroup);
-				caller->PrevX += caller->_f_X() - displacedold.x;
+				caller->Prev += caller->Pos() - displacedold;
-				caller->PrevY += caller->_f_Y() - displacedold.y;
-				caller->PrevZ += caller->_f_Z() - displacedold.z;
 				caller->PrevPortalGroup = caller->Sector->PortalGroup;
 			}
 			else if (flags & WARPF_COPYINTERPOLATION)
 			{
 				// Map both positions of the reference actor to the current portal group
-				fixedvec3 displacedold = old + Displacements.getOffset(reference->PrevPortalGroup, caller->Sector->PortalGroup);
+				DVector3 displacedold = old + Displacements.getOffset(reference->PrevPortalGroup, caller->Sector->PortalGroup);
-				fixedvec3 displacedref = old + Displacements.getOffset(reference->Sector->PortalGroup, caller->Sector->PortalGroup);
+				DVector3 displacedref = old + Displacements.getOffset(reference->Sector->PortalGroup, caller->Sector->PortalGroup);
-				caller->PrevX = caller->_f_X() + displacedold.x - displacedref.x;
+				caller->Prev = caller->Pos() + displacedold - displacedref;
-				caller->PrevY = caller->_f_Y() + displacedold.y - displacedref.y;
-				caller->PrevZ = caller->_f_Z() + displacedold.z - displacedref.z;
 				caller->PrevPortalGroup = caller->Sector->PortalGroup;
 			}
 			else if (!(flags & WARPF_INTERPOLATE))
 			{
 				caller->ClearInterpolation();
 			}
-#endif
 
 			if ((flags & WARPF_BOB) && (reference->flags2 & MF2_FLOATBOB))
 			{

src/portal.cpp

@@ -1209,7 +1209,7 @@ bool P_CollectConnectedGroups(int startgroup, const fixedvec3 &position, fixed_t
 		while (!wsec->PortalBlocksMovement(sector_t::ceiling) && upperz > FLOAT2FIXED(wsec->SkyBoxes[sector_t::ceiling]->specialf1))
 		{
 			sector_t *othersec = wsec->SkyBoxes[sector_t::ceiling]->Sector;
-			fixedvec2 pos = Displacements.getOffset(startgroup, othersec->PortalGroup);
+			fixedvec2 pos = Displacements._f_getOffset(startgroup, othersec->PortalGroup);
 			fixed_t dx = position.x + pos.x;
 			fixed_t dy = position.y + pos.y;
 			processMask.setBit(othersec->PortalGroup);
@@ -1221,7 +1221,7 @@ bool P_CollectConnectedGroups(int startgroup, const fixedvec3 &position, fixed_t
 		while (!wsec->PortalBlocksMovement(sector_t::floor) && position.z < FLOAT2FIXED(wsec->SkyBoxes[sector_t::floor]->specialf1))
 		{
 			sector_t *othersec = wsec->SkyBoxes[sector_t::floor]->Sector;
-			fixedvec2 pos = Displacements.getOffset(startgroup, othersec->PortalGroup);
+			fixedvec2 pos = Displacements._f_getOffset(startgroup, othersec->PortalGroup);
 			fixed_t dx = position.x + pos.x;
 			fixed_t dy = position.y + pos.y;
 			processMask.setBit(othersec->PortalGroup | FPortalGroupArray::LOWER);
@@ -1236,7 +1236,7 @@ bool P_CollectConnectedGroups(int startgroup, const fixedvec3 &position, fixed_t
 			int thisgroup = startgroup;
 			for (unsigned i = 0; i < groupsToCheck.Size();i++)
 			{
-				fixedvec2 disp = Displacements.getOffset(startgroup, thisgroup & ~FPortalGroupArray::FLAT);
+				fixedvec2 disp = Displacements._f_getOffset(startgroup, thisgroup & ~FPortalGroupArray::FLAT);
 				FBoundingBox box(position.x + disp.x, position.y + disp.y, checkradius);
 				FBlockLinesIterator it(box);
 				line_t *ld;

src/portal.h

@@ -54,7 +54,7 @@ struct FDisplacementTable
 		return data[x + size*y];
 	}
 
-	fixedvec2 getOffset(int x, int y) const
+	fixedvec2 _f_getOffset(int x, int y) const
 	{
 		if (x == y)
 		{
@@ -63,6 +63,18 @@ struct FDisplacementTable
 		}
 		return data[x + size*y].pos;
 	}
+
+	DVector2 getOffset(int x, int y) const
+	{
+		if (x == y)
+		{
+			DVector2 nulvec = { 0,0 };
+			return nulvec;	// shortcut for the most common case
+		}
+		fixedvec2 &p = data[x + size*y].pos;
+		return{ FIXED2DBL(p.x), FIXED2DBL(p.y) };
+	}
+
 };
 
 extern FDisplacementTable Displacements;

src/r_defs.h

@@ -838,12 +838,12 @@ struct sector_t
 	// These may only be called if the portal has been validated
 	fixedvec2 FloorDisplacement()
 	{
-		return Displacements.getOffset(PortalGroup, SkyBoxes[sector_t::floor]->Sector->PortalGroup);
+		return Displacements._f_getOffset(PortalGroup, SkyBoxes[sector_t::floor]->Sector->PortalGroup);
 	}
 
 	fixedvec2 CeilingDisplacement()
 	{
-		return Displacements.getOffset(PortalGroup, SkyBoxes[sector_t::ceiling]->Sector->PortalGroup);
+		return Displacements._f_getOffset(PortalGroup, SkyBoxes[sector_t::ceiling]->Sector->PortalGroup);
 	}
 
 	int GetTerrain(int pos) const;
@@ -1336,34 +1336,58 @@ inline sector_t *P_PointInSector(const DVector2 &pos)
 
 inline fixedvec3 AActor::_f_PosRelative(int portalgroup) const
 {
-	return _f_Pos() + Displacements.getOffset(Sector->PortalGroup, portalgroup);
+	return _f_Pos() + Displacements._f_getOffset(Sector->PortalGroup, portalgroup);
 }
 
 inline fixedvec3 AActor::_f_PosRelative(const AActor *other) const
 {
-	return _f_Pos() + Displacements.getOffset(Sector->PortalGroup, other->Sector->PortalGroup);
+	return _f_Pos() + Displacements._f_getOffset(Sector->PortalGroup, other->Sector->PortalGroup);
 }
 
 inline fixedvec3 AActor::_f_PosRelative(sector_t *sec) const
 {
-	return _f_Pos() + Displacements.getOffset(Sector->PortalGroup, sec->PortalGroup);
+	return _f_Pos() + Displacements._f_getOffset(Sector->PortalGroup, sec->PortalGroup);
 }
 
 inline fixedvec3 AActor::_f_PosRelative(line_t *line) const
 {
-	return _f_Pos() + Displacements.getOffset(Sector->PortalGroup, line->frontsector->PortalGroup);
+	return _f_Pos() + Displacements._f_getOffset(Sector->PortalGroup, line->frontsector->PortalGroup);
 }
 
 inline fixedvec3 _f_PosRelative(const fixedvec3 &pos, line_t *line, sector_t *refsec = NULL)
+{
+	return pos + Displacements._f_getOffset(refsec->PortalGroup, line->frontsector->PortalGroup);
+}
+
+inline DVector3 AActor::PosRelative(int portalgroup) const
+{
+	return Pos() + Displacements.getOffset(Sector->PortalGroup, portalgroup);
+}
+
+inline DVector3 AActor::PosRelative(const AActor *other) const
+{
+	return Pos() + Displacements.getOffset(Sector->PortalGroup, other->Sector->PortalGroup);
+}
+
+inline DVector3 AActor::PosRelative(sector_t *sec) const
+{
+	return Pos() + Displacements.getOffset(Sector->PortalGroup, sec->PortalGroup);
+}
+
+inline DVector3 AActor::PosRelative(line_t *line) const
+{
+	return Pos() + Displacements.getOffset(Sector->PortalGroup, line->frontsector->PortalGroup);
+}
+
+inline DVector3 PosRelative(const DVector3 &pos, line_t *line, sector_t *refsec = NULL)
 {
 	return pos + Displacements.getOffset(refsec->PortalGroup, line->frontsector->PortalGroup);
 }
 
+
 inline void AActor::ClearInterpolation()
 {
-	PrevX = _f_X();
+	Prev = Pos();
-	PrevY = _f_Y();
-	PrevZ = _f_Z();
 	PrevAngles = Angles;
 	if (Sector) PrevPortalGroup = Sector->PortalGroup;
 	else PrevPortalGroup = 0;

src/r_plane.cpp

@@ -1239,10 +1239,10 @@ void R_DrawSkyBoxes ()
 			extralight = 0;
 			R_SetVisibility (sky->args[0] * 0.25f);
 
-			fixedvec3 viewpos = sky->InterpolatedPosition(r_TicFrac);
+			DVector3 viewpos = sky->InterpolatedPosition(r_TicFracF);
-			viewx = viewpos.x;
+			viewx = FLOAT2FIXED(viewpos.X);
-			viewy = viewpos.y;
+			viewy = FLOAT2FIXED(viewpos.Y);
-			viewz = viewpos.z;
+			viewz = FLOAT2FIXED(viewpos.Z);
 			viewangle = savedangle + (sky->PrevAngles.Yaw + (sky->Angles.Yaw * r_TicFracF) - sky->PrevAngles.Yaw).BAMs();
 
 			R_CopyStackedViewParameters();
@@ -1251,8 +1251,8 @@ void R_DrawSkyBoxes ()
 		{
 			extralight = pl->extralight;
 			R_SetVisibility (pl->visibility);
-			viewx = pl->viewx - sky->Mate->_f_X() + sky->_f_X();
+			viewx = pl->viewx - FLOAT2FIXED(sky->Mate->X() + sky->X());
-			viewy = pl->viewy - sky->Mate->_f_Y() + sky->_f_Y();
+			viewy = pl->viewy - FLOAT2FIXED(sky->Mate->Y() + sky->Y());
 			viewz = pl->viewz;
 			viewangle = pl->viewangle;
 		}

src/r_things.cpp

@@ -767,10 +767,10 @@ void R_ProjectSprite (AActor *thing, int fakeside, F3DFloor *fakefloor, F3DFloor
 		return;
 
 	// [RH] Interpolate the sprite's position to make it look smooth
-	fixedvec3 pos = thing->InterpolatedPosition(r_TicFrac);
+	DVector3 pos = thing->InterpolatedPosition(r_TicFracF);
-	fx = pos.x;
+	fx = FLOAT2FIXED(pos.X);
-	fy = pos.y;
+	fy = FLOAT2FIXED(pos.Y);
-	fz = pos.z + thing->_f_GetBobOffset(r_TicFrac);
+	fz = FLOAT2FIXED(pos.Z + thing->GetBobOffset(r_TicFracF));
 
 	tex = NULL;
 	voxel = NULL;

src/r_utility.cpp

@@ -652,7 +652,7 @@ void R_InterpolateView (player_t *player, fixed_t frac, InterpolationViewer *ivi
 	}
 	else
 	{
-		fixedvec2 disp = Displacements.getOffset(oldgroup, newgroup);
+		fixedvec2 disp = Displacements._f_getOffset(oldgroup, newgroup);
 		viewx = iview->oviewx + FixedMul(frac, iview->nviewx - iview->oviewx - disp.x);
 		viewy = iview->oviewy + FixedMul(frac, iview->nviewy - iview->oviewy - disp.y);
 		viewz = iview->oviewz + FixedMul(frac, iview->nviewz - iview->oviewz);