diff --git a/src/g_shared/a_decals.cpp b/src/g_shared/a_decals.cpp
index cdf3c2b2e..c37c1065a 100644
--- a/src/g_shared/a_decals.cpp
+++ b/src/g_shared/a_decals.cpp
@@ -250,27 +250,27 @@ FTextureID DBaseDecal::StickToWall (side_t *wall, double x, double y, F3DFloor *
 	{
 		RenderFlags |= RF_RELMID;
 		if (line->flags & ML_DONTPEGBOTTOM)
-			Z -= front->GetPlaneTexZF(sector_t::floor);
+			Z -= front->GetPlaneTexZ(sector_t::floor);
 		else
-			Z -= front->GetPlaneTexZF(sector_t::ceiling);
+			Z -= front->GetPlaneTexZ(sector_t::ceiling);
 		tex = wall->GetTexture(side_t::mid);
 	}
 	else if (back->floorplane.ZatPoint (x, y) >= Z)
 	{
 		RenderFlags |= RF_RELLOWER|RF_CLIPLOWER;
 		if (line->flags & ML_DONTPEGBOTTOM)
-			Z -= front->GetPlaneTexZF(sector_t::ceiling);
+			Z -= front->GetPlaneTexZ(sector_t::ceiling);
 		else
-			Z -= back->GetPlaneTexZF(sector_t::floor);
+			Z -= back->GetPlaneTexZ(sector_t::floor);
 		tex = wall->GetTexture(side_t::bottom);
 	}
 	else if (back->ceilingplane.ZatPoint (x, y) <= Z)
 	{
 		RenderFlags |= RF_RELUPPER|RF_CLIPUPPER;
 		if (line->flags & ML_DONTPEGTOP)
-			Z -= front->GetPlaneTexZF(sector_t::ceiling);
+			Z -= front->GetPlaneTexZ(sector_t::ceiling);
 		else
-			Z -= back->GetPlaneTexZF(sector_t::ceiling);
+			Z -= back->GetPlaneTexZ(sector_t::ceiling);
 		tex = wall->GetTexture(side_t::top);
 	}
 	else if (ffloor) // this is a 3d-floor segment - do this only if we know which one!
@@ -278,9 +278,9 @@ FTextureID DBaseDecal::StickToWall (side_t *wall, double x, double y, F3DFloor *
 		Sector=ffloor->model;
 		RenderFlags |= RF_RELMID|RF_CLIPMID;
 		if (line->flags & ML_DONTPEGBOTTOM)
-			Z -= Sector->GetPlaneTexZF(sector_t::floor);
+			Z -= Sector->GetPlaneTexZ(sector_t::floor);
 		else
-			Z -= Sector->GetPlaneTexZF(sector_t::ceiling);
+			Z -= Sector->GetPlaneTexZ(sector_t::ceiling);
 
 		if (ffloor->flags & FF_UPPERTEXTURE)
 		{
@@ -335,29 +335,29 @@ double DBaseDecal::GetRealZ (const side_t *wall) const
 	case RF_RELUPPER:
 		if (line->flags & ML_DONTPEGTOP)
 		{
-			return Z + front->GetPlaneTexZF(sector_t::ceiling);
+			return Z + front->GetPlaneTexZ(sector_t::ceiling);
 		}
 		else
 		{
-			return Z + back->GetPlaneTexZF(sector_t::ceiling);
+			return Z + back->GetPlaneTexZ(sector_t::ceiling);
 		}
 	case RF_RELLOWER:
 		if (line->flags & ML_DONTPEGBOTTOM)
 		{
-			return Z + front->GetPlaneTexZF(sector_t::ceiling);
+			return Z + front->GetPlaneTexZ(sector_t::ceiling);
 		}
 		else
 		{
-			return Z + back->GetPlaneTexZF(sector_t::floor);
+			return Z + back->GetPlaneTexZ(sector_t::floor);
 		}
 	case RF_RELMID:
 		if (line->flags & ML_DONTPEGBOTTOM)
 		{
-			return Z + front->GetPlaneTexZF(sector_t::floor);
+			return Z + front->GetPlaneTexZ(sector_t::floor);
 		}
 		else
 		{
-			return Z + front->GetPlaneTexZF(sector_t::ceiling);
+			return Z + front->GetPlaneTexZ(sector_t::ceiling);
 		}
 	}
 }
diff --git a/src/p_3dmidtex.cpp b/src/p_3dmidtex.cpp
index 069a89e54..26e9cf58b 100644
--- a/src/p_3dmidtex.cpp
+++ b/src/p_3dmidtex.cpp
@@ -242,14 +242,14 @@ bool P_GetMidTexturePosition(const line_t *line, int sideno, double *ptextop, do
 	if(line->flags & ML_DONTPEGBOTTOM)
 	{
 		*ptexbot = y_offset +
-			MAX(line->frontsector->GetPlaneTexZF(sector_t::floor), line->backsector->GetPlaneTexZF(sector_t::floor));
+			MAX(line->frontsector->GetPlaneTexZ(sector_t::floor), line->backsector->GetPlaneTexZ(sector_t::floor));
 
 		*ptextop = *ptexbot + textureheight;
 	}
 	else
 	{
 		*ptextop = y_offset +
-		   MIN(line->frontsector->GetPlaneTexZF(sector_t::ceiling), line->backsector->GetPlaneTexZF(sector_t::ceiling));
+		   MIN(line->frontsector->GetPlaneTexZ(sector_t::ceiling), line->backsector->GetPlaneTexZ(sector_t::ceiling));
 		
 		*ptexbot = *ptextop - textureheight;
 	}
diff --git a/src/p_buildmap.cpp b/src/p_buildmap.cpp
index 428e5e367..7e65bf05d 100644
--- a/src/p_buildmap.cpp
+++ b/src/p_buildmap.cpp
@@ -593,11 +593,11 @@ static void LoadWalls (walltype *walls, int numwalls, sectortype *bsec)
 		{
 			if (walls[i].cstat & 512)
 			{
-				lines[j].Alpha = TRANSLUC33;
+				lines[j].alpha = 1/3.;
 			}
 			else
 			{
-				lines[j].Alpha = TRANSLUC66;
+				lines[j].alpha = 2/3.;
 			}
 		}
 		if (walls[i].cstat & 1)
diff --git a/src/p_glnodes.cpp b/src/p_glnodes.cpp
index bc96f14bd..739990692 100644
--- a/src/p_glnodes.cpp
+++ b/src/p_glnodes.cpp
@@ -263,7 +263,7 @@ static bool LoadGLVertexes(FileReader * lump)
 
 	for (i = firstglvertex; i < numvertexes; i++)
 	{
-		vertexes[i].set(LittleLong(mgl->x), LittleLong(mgl->y));
+		vertexes[i].set(LittleLong(mgl->x)/65536., LittleLong(mgl->y)/65536.);
 		mgl++;
 	}
 	delete[] gldata;
diff --git a/src/p_linkedsectors.cpp b/src/p_linkedsectors.cpp
index 583175def..37743455d 100644
--- a/src/p_linkedsectors.cpp
+++ b/src/p_linkedsectors.cpp
@@ -103,7 +103,7 @@ static bool MoveCeiling(sector_t *sector, int crush, double move)
 	// Don't let the ceiling go below the floor
 	if (!sector->ceilingplane.isSlope() && !sector->floorplane.isSlope() &&
 		!sector->PortalIsLinked(sector_t::floor) &&
-		sector->GetPlaneTexZF(sector_t::floor)  > sector->GetPlaneTexZF(sector_t::ceiling)) return false;
+		sector->GetPlaneTexZ(sector_t::floor)  > sector->GetPlaneTexZ(sector_t::ceiling)) return false;
 
 	return true;
 }
@@ -118,7 +118,7 @@ static bool MoveFloor(sector_t *sector, int crush, double move)
 	// Don't let the floor go above the ceiling
 	if (!sector->ceilingplane.isSlope() && !sector->floorplane.isSlope() &&
 		!sector->PortalIsLinked(sector_t::ceiling) &&
-		 sector->GetPlaneTexZF(sector_t::floor) > sector->GetPlaneTexZF(sector_t::ceiling)) return false;
+		 sector->GetPlaneTexZ(sector_t::floor) > sector->GetPlaneTexZ(sector_t::ceiling)) return false;
 
 	return true;
 }
diff --git a/src/p_lnspec.cpp b/src/p_lnspec.cpp
index 2462f036c..4fca74959 100644
--- a/src/p_lnspec.cpp
+++ b/src/p_lnspec.cpp
@@ -2987,7 +2987,7 @@ FUNC(LS_TranslucentLine)
 	int linenum;
 	while ((linenum = itr.Next()) >= 0)
 	{
-		lines[linenum].Alpha = Scale(clamp(arg1, 0, 255), OPAQUE, 255);
+		lines[linenum].alpha = clamp(arg1, 0, 255) / 255.;
 		if (arg2 == 0)
 		{
 			lines[linenum].flags &= ~ML_ADDTRANS;
diff --git a/src/p_saveg.cpp b/src/p_saveg.cpp
index 5e3ed2416..9af2cd573 100644
--- a/src/p_saveg.cpp
+++ b/src/p_saveg.cpp
@@ -396,7 +396,7 @@ void P_SerializeWorld (FArchive &arc)
 		arc << li->flags
 			<< li->activation
 			<< li->special
-			<< li->Alpha;
+			<< li->alpha;
 
 		if (P_IsACSSpecial(li->special))
 		{
diff --git a/src/p_sectors.cpp b/src/p_sectors.cpp
index 7db61dc67..9199f0812 100644
--- a/src/p_sectors.cpp
+++ b/src/p_sectors.cpp
@@ -73,7 +73,7 @@ double sector_t::FindLowestFloorSurrounding (vertex_t **v) const
 	double ofloor;
 	vertex_t *spot;
 
-	if (linecount == 0) return GetPlaneTexZF(sector_t::floor);
+	if (linecount == 0) return GetPlaneTexZ(sector_t::floor);
 
 	spot = lines[0]->v1;
 	floor = floorplane.ZatPoint(spot);
@@ -117,7 +117,7 @@ double sector_t::FindHighestFloorSurrounding (vertex_t **v) const
 	double ofloor;
 	vertex_t *spot;
 
-	if (linecount == 0) return GetPlaneTexZF(sector_t::floor);
+	if (linecount == 0) return GetPlaneTexZ(sector_t::floor);
 
 	spot = lines[0]->v1;
 	floor = -FLT_MAX;
@@ -168,7 +168,7 @@ double sector_t::FindNextHighestFloor (vertex_t **v) const
 	line_t *check;
 	int i;
 
-	if (linecount == 0) return GetPlaneTexZF(sector_t::floor);
+	if (linecount == 0) return GetPlaneTexZ(sector_t::floor);
 
 	spot = lines[0]->v1;
 	height = floorplane.ZatPoint(spot);
@@ -223,7 +223,7 @@ double sector_t::FindNextLowestFloor (vertex_t **v) const
 	line_t *check;
 	int i;
 
-	if (linecount == 0) return GetPlaneTexZF(sector_t::floor);
+	if (linecount == 0) return GetPlaneTexZ(sector_t::floor);
 
 	spot = lines[0]->v1;
 	height = floorplane.ZatPoint (spot);
@@ -278,7 +278,7 @@ double sector_t::FindNextLowestCeiling (vertex_t **v) const
 	int i;
 
 
-	if (linecount == 0) return GetPlaneTexZF(sector_t::ceiling);
+	if (linecount == 0) return GetPlaneTexZ(sector_t::ceiling);
 
 	spot = lines[0]->v1;
 	height = ceilingplane.ZatPoint(spot);
@@ -332,7 +332,7 @@ double sector_t::FindNextHighestCeiling (vertex_t **v) const
 	line_t *check;
 	int i;
 
-	if (linecount == 0) return GetPlaneTexZF(sector_t::ceiling);
+	if (linecount == 0) return GetPlaneTexZ(sector_t::ceiling);
 
 	spot = lines[0]->v1;
 	height = ceilingplane.ZatPoint(spot);
@@ -378,7 +378,7 @@ double sector_t::FindLowestCeilingSurrounding (vertex_t **v) const
 	line_t *check;
 	int i;
 
-	if (linecount == 0) return GetPlaneTexZF(sector_t::ceiling);
+	if (linecount == 0) return GetPlaneTexZ(sector_t::ceiling);
 
 	spot = lines[0]->v1;
 	height = FLT_MAX;
@@ -420,7 +420,7 @@ double sector_t::FindHighestCeilingSurrounding (vertex_t **v) const
 	line_t *check;
 	int i;
 
-	if (linecount == 0) return GetPlaneTexZF(sector_t::ceiling);
+	if (linecount == 0) return GetPlaneTexZ(sector_t::ceiling);
 
 	spot = lines[0]->v1;
 	height = -FLT_MAX;
@@ -879,7 +879,7 @@ void sector_t::CheckPortalPlane(int plane)
 	if (GetPortalType(plane) == PORTS_LINKEDPORTAL)
 	{
 		double portalh = GetPortalPlaneZ(plane);
-		double planeh = GetPlaneTexZF(plane);
+		double planeh = GetPlaneTexZ(plane);
 		int obstructed = PLANEF_OBSTRUCTED * (plane == sector_t::floor ? planeh > portalh : planeh < portalh);
 		planes[plane].Flags = (planes[plane].Flags  & ~PLANEF_OBSTRUCTED) | obstructed;
 	}
diff --git a/src/p_setup.cpp b/src/p_setup.cpp
index e1dff8762..ebd38ba9a 100644
--- a/src/p_setup.cpp
+++ b/src/p_setup.cpp
@@ -862,7 +862,7 @@ void P_LoadVertexes (MapData * map)
 		SWORD x, y;
 
 		(*map->file) >> x >> y;
-		vertexes[i].set(x << FRACBITS, y << FRACBITS);
+		vertexes[i].set(double(x), double(y));
 	}
 }
 
@@ -1497,9 +1497,9 @@ void P_LoadSectors (MapData *map, FMissingTextureTracker &missingtex)
 		ss->e = &sectors[0].e[i];
 		if (!map->HasBehavior) ss->Flags |= SECF_FLOORDROP;
 		ss->SetPlaneTexZ(sector_t::floor, (double)LittleShort(ms->floorheight));
-		ss->floorplane.set(0, 0, 1., -ss->GetPlaneTexZF(sector_t::floor));
+		ss->floorplane.set(0, 0, 1., -ss->GetPlaneTexZ(sector_t::floor));
 		ss->SetPlaneTexZ(sector_t::ceiling, (double)LittleShort(ms->ceilingheight));
-		ss->ceilingplane.set(0, 0, -1., ss->GetPlaneTexZF(sector_t::ceiling));
+		ss->ceilingplane.set(0, 0, -1., ss->GetPlaneTexZ(sector_t::ceiling));
 		SetTexture(ss, i, sector_t::floor, ms->floorpic, missingtex, true);
 		SetTexture(ss, i, sector_t::ceiling, ms->ceilingpic, missingtex, true);
 		ss->lightlevel = LittleShort(ms->lightlevel);
@@ -2043,10 +2043,10 @@ void P_FinishLoadingLineDef(line_t *ld, int alpha)
 			additive = true;
 		}
 
-		alpha = Scale(alpha, OPAQUE, 255); 
+		double dalpha = alpha / 255.;
 		if (!ld->args[0])
 		{
-			ld->Alpha = alpha;
+			ld->alpha = dalpha;
 			if (additive)
 			{
 				ld->flags |= ML_ADDTRANS;
@@ -2058,7 +2058,7 @@ void P_FinishLoadingLineDef(line_t *ld, int alpha)
 			{
 				if (tagManager.LineHasID(j, ld->args[0]))
 				{
-					lines[j].Alpha = alpha;
+					lines[j].alpha = dalpha;
 					if (additive)
 					{
 						lines[j].flags |= ML_ADDTRANS;
@@ -2160,7 +2160,7 @@ void P_LoadLineDefs (MapData * map)
 	ld = lines;
 	for (i = 0; i < numlines; i++, mld++, ld++)
 	{
-		ld->Alpha = OPAQUE;	// [RH] Opaque by default
+		ld->alpha = 1.;	// [RH] Opaque by default
 		ld->portalindex = UINT_MAX;
 
 		// [RH] Translate old linedef special and flags to be
@@ -2264,7 +2264,7 @@ void P_LoadLineDefs2 (MapData * map)
 
 		ld->v1 = &vertexes[LittleShort(mld->v1)];
 		ld->v2 = &vertexes[LittleShort(mld->v2)];
-		ld->Alpha = OPAQUE;	// [RH] Opaque by default
+		ld->alpha = 1.;	// [RH] Opaque by default
 
 		P_SetSideNum (&ld->sidedef[0], LittleShort(mld->sidenum[0]));
 		P_SetSideNum (&ld->sidedef[1], LittleShort(mld->sidenum[1]));
diff --git a/src/p_slopes.cpp b/src/p_slopes.cpp
index 1ee992d5e..66b3d0747 100644
--- a/src/p_slopes.cpp
+++ b/src/p_slopes.cpp
@@ -209,7 +209,7 @@ void P_VavoomSlope(sector_t * sec, int id, const DVector3 &pos, int which)
 		{
 			DVector3 v1, v2, cross;
 			secplane_t *srcplane = (which == 0) ? &sec->floorplane : &sec->ceilingplane;
-			double srcheight = (which == 0) ? sec->GetPlaneTexZF(sector_t::floor) : sec->GetPlaneTexZF(sector_t::ceiling);
+			double srcheight = (which == 0) ? sec->GetPlaneTexZ(sector_t::floor) : sec->GetPlaneTexZ(sector_t::ceiling);
 
 			v1[0] = pos.X - l->v2->fX();
 			v1[1] = pos.Y - l->v2->fY();
@@ -328,9 +328,9 @@ static void P_SetSlopesFromVertexHeights(FMapThing *firstmt, FMapThing *lastmt,
 				double *h3 = vt_heights[j].CheckKey(vi3);
 				if (h1 == NULL && h2 == NULL && h3 == NULL) continue;
 
-				vt1.Z = h1? *h1 : j==0? sec->GetPlaneTexZF(sector_t::floor) : sec->GetPlaneTexZF(sector_t::ceiling);
-				vt2.Z = h2? *h2 : j==0? sec->GetPlaneTexZF(sector_t::floor) : sec->GetPlaneTexZF(sector_t::ceiling);
-				vt3.Z = h3? *h3 : j==0? sec->GetPlaneTexZF(sector_t::floor) : sec->GetPlaneTexZF(sector_t::ceiling);
+				vt1.Z = h1? *h1 : j==0? sec->GetPlaneTexZ(sector_t::floor) : sec->GetPlaneTexZ(sector_t::ceiling);
+				vt2.Z = h2? *h2 : j==0? sec->GetPlaneTexZ(sector_t::floor) : sec->GetPlaneTexZ(sector_t::ceiling);
+				vt3.Z = h3? *h3 : j==0? sec->GetPlaneTexZ(sector_t::floor) : sec->GetPlaneTexZ(sector_t::ceiling);
 
 				if (P_PointOnLineSidePrecise(vertexes[vi3].fX(), vertexes[vi3].fY(), sec->lines[0]) == 0)
 				{
@@ -488,8 +488,8 @@ static void P_AlignPlane(sector_t *sec, line_t *line, int which)
 	double srcheight, destheight;
 
 	srcplane = (which == 0) ? &sec->floorplane : &sec->ceilingplane;
-	srcheight = (which == 0) ? sec->GetPlaneTexZF(sector_t::floor) : sec->GetPlaneTexZF(sector_t::ceiling);
-	destheight = (which == 0) ? refsec->GetPlaneTexZF(sector_t::floor) : refsec->GetPlaneTexZF(sector_t::ceiling);
+	srcheight = (which == 0) ? sec->GetPlaneTexZ(sector_t::floor) : sec->GetPlaneTexZ(sector_t::ceiling);
+	destheight = (which == 0) ? refsec->GetPlaneTexZ(sector_t::floor) : refsec->GetPlaneTexZ(sector_t::ceiling);
 
 	p[0] = line->v1->fX();
 	p[1] = line->v1->fY();
diff --git a/src/p_spec.cpp b/src/p_spec.cpp
index af6a82083..67bb4de73 100644
--- a/src/p_spec.cpp
+++ b/src/p_spec.cpp
@@ -841,7 +841,7 @@ static void SetupFloorPortal (AStackPoint *point)
 	if (skyv != NULL)
 	{
 		skyv->target = point;
-		if (Sector->GetAlphaF(sector_t::floor) == 1.)
+		if (Sector->GetAlpha(sector_t::floor) == 1.)
 			Sector->SetAlpha(sector_t::floor, clamp(point->args[0], 0, 255) / 255.);
 
 		Sector->Portals[sector_t::floor] = P_GetStackPortal(skyv, sector_t::floor);
@@ -856,7 +856,7 @@ static void SetupCeilingPortal (AStackPoint *point)
 	if (skyv != NULL)
 	{
 		skyv->target = point;
-		if (Sector->GetAlphaF(sector_t::ceiling) == 1.)
+		if (Sector->GetAlpha(sector_t::ceiling) == 1.)
 			Sector->SetAlpha(sector_t::ceiling, clamp(point->args[0], 0, 255) / 255.);
 
 		Sector->Portals[sector_t::ceiling] = P_GetStackPortal(skyv, sector_t::ceiling);
@@ -917,7 +917,7 @@ static void SetPortal(sector_t *sector, int plane, unsigned pnum, double alpha)
 		if (sector->GetPortalType(sector_t::ceiling) == PORTS_SKYVIEWPOINT)
 		{
 			sector->Portals[sector_t::ceiling] = pnum;
-			if (sector->GetAlphaF(sector_t::ceiling) == 1.)
+			if (sector->GetAlpha(sector_t::ceiling) == 1.)
 				sector->SetAlpha(sector_t::ceiling, alpha);
 
 			if (sectorPortals[pnum].mFlags & PORTSF_SKYFLATONLY)
@@ -930,7 +930,7 @@ static void SetPortal(sector_t *sector, int plane, unsigned pnum, double alpha)
 		{
 			sector->Portals[sector_t::floor] = pnum;
 		}
-		if (sector->GetAlphaF(sector_t::floor) == 1.)
+		if (sector->GetAlpha(sector_t::floor) == 1.)
 			sector->SetAlpha(sector_t::floor, alpha);
 
 		if (sectorPortals[pnum].mFlags & PORTSF_SKYFLATONLY)
diff --git a/src/p_udmf.cpp b/src/p_udmf.cpp
index 20852a585..86116f881 100644
--- a/src/p_udmf.cpp
+++ b/src/p_udmf.cpp
@@ -785,7 +785,7 @@ public:
 		FString tagstring;
 
 		memset(ld, 0, sizeof(*ld));
-		ld->Alpha = OPAQUE;
+		ld->alpha = 1.;
 		ld->portalindex = UINT_MAX;
 		ld->sidedef[0] = ld->sidedef[1] = NULL;
 		if (level.flags2 & LEVEL2_CLIPMIDTEX) ld->flags |= ML_CLIP_MIDTEX;
@@ -1087,13 +1087,13 @@ public:
 		{
 			ld->activation = (ld->activation & ~SPAC_Use) | SPAC_UseThrough;
 		}
-		if (strifetrans && ld->Alpha == OPAQUE)
+		if (strifetrans && ld->alpha == 1.)
 		{
-			ld->Alpha = TRANSLUC75;
+			ld->alpha = 0.75;
 		}
-		if (strifetrans2 && ld->Alpha == OPAQUE)
+		if (strifetrans2 && ld->alpha == OPAQUE)
 		{
-			ld->Alpha = TRANSLUC25;
+			ld->alpha = 0.25;
 		}
 		if (ld->sidedef[0] == NULL)
 		{
@@ -1596,7 +1596,7 @@ public:
 		// Reset the planes to their defaults if not all of the plane equation's parameters were found.
 		if (fplaneflags != 15)
 		{
-			sec->floorplane.SetAtHeight(sec->GetPlaneTexZF(sector_t::floor), sector_t::floor);
+			sec->floorplane.SetAtHeight(sec->GetPlaneTexZ(sector_t::floor), sector_t::floor);
 		}
 		else
 		{
@@ -1606,7 +1606,7 @@ public:
 		}
 		if (cplaneflags != 15)
 		{
-			sec->ceilingplane.SetAtHeight(sec->GetPlaneTexZF(sector_t::ceiling), sector_t::ceiling);
+			sec->ceilingplane.SetAtHeight(sec->GetPlaneTexZ(sector_t::ceiling), sector_t::ceiling);
 		}
 		else
 		{
diff --git a/src/p_writemap.cpp b/src/p_writemap.cpp
index 20848712a..e26e3cf53 100644
--- a/src/p_writemap.cpp
+++ b/src/p_writemap.cpp
@@ -196,8 +196,8 @@ static int WriteSECTORS (FILE *file)
 
 	for (int i = 0; i < numsectors; ++i)
 	{
-		ms.floorheight = LittleShort(short(sectors[i].GetPlaneTexZF(sector_t::floor)));
-		ms.ceilingheight = LittleShort(short(sectors[i].GetPlaneTexZF(sector_t::ceiling)));
+		ms.floorheight = LittleShort(short(sectors[i].GetPlaneTexZ(sector_t::floor)));
+		ms.ceilingheight = LittleShort(short(sectors[i].GetPlaneTexZ(sector_t::ceiling)));
 		uppercopy (ms.floorpic, GetTextureName (sectors[i].GetTexture(sector_t::floor)));
 		uppercopy (ms.ceilingpic, GetTextureName (sectors[i].GetTexture(sector_t::ceiling)));
 		ms.lightlevel = LittleShort((short)sectors[i].lightlevel);
diff --git a/src/p_xlat.cpp b/src/p_xlat.cpp
index 2e30925bb..424b93a52 100644
--- a/src/p_xlat.cpp
+++ b/src/p_xlat.cpp
@@ -87,10 +87,10 @@ void P_TranslateLineDef (line_t *ld, maplinedef_t *mld, int lineindexforid)
 				passthrough = true;
 				break;
 			case -2:
-				ld->Alpha = TRANSLUC75;
+				ld->alpha = 0.75;
 				break;
 			case -3:
-				ld->Alpha = TRANSLUC25;
+				ld->alpha = 0.25;
 				break;
 			default:
 				newflags |= LineFlagTranslations[i].newvalue;
diff --git a/src/portal.cpp b/src/portal.cpp
index 6abd4e8da..964f742c7 100644
--- a/src/portal.cpp
+++ b/src/portal.cpp
@@ -708,7 +708,7 @@ unsigned P_GetPortal(int type, int plane, sector_t *from, sector_t *to, const DV
 	sectorPortals[i].mOrigin = from;
 	sectorPortals[i].mDestination = to;
 	sectorPortals[i].mDisplacement = displacement;
-	sectorPortals[i].mPlaneZ = type == PORTS_LINKEDPORTAL? from->GetPlaneTexZF(plane) : FLT_MAX;
+	sectorPortals[i].mPlaneZ = type == PORTS_LINKEDPORTAL? from->GetPlaneTexZ(plane) : FLT_MAX;
 	return i;
 }
 
diff --git a/src/r_data/r_interpolate.cpp b/src/r_data/r_interpolate.cpp
index 3f97c413b..4b826c56b 100644
--- a/src/r_data/r_interpolate.cpp
+++ b/src/r_data/r_interpolate.cpp
@@ -441,12 +441,12 @@ void DSectorPlaneInterpolation::UpdateInterpolation()
 	if (!ceiling)
 	{
 		oldheight = sector->floorplane.fD();
-		oldtexz = sector->GetPlaneTexZF(sector_t::floor);
+		oldtexz = sector->GetPlaneTexZ(sector_t::floor);
 	}
 	else
 	{
 		oldheight = sector->ceilingplane.fD();
-		oldtexz = sector->GetPlaneTexZF(sector_t::ceiling);
+		oldtexz = sector->GetPlaneTexZ(sector_t::ceiling);
 	}
 }
 
@@ -495,7 +495,7 @@ void DSectorPlaneInterpolation::Interpolate(double smoothratio)
 	}
 
 	bakheight = pplane->fD();
-	baktexz = sector->GetPlaneTexZF(pos);
+	baktexz = sector->GetPlaneTexZ(pos);
 
 	if (refcount == 0 && oldheight == bakheight)
 	{
diff --git a/src/r_defs.h b/src/r_defs.h
index 6a811f911..371b9918e 100644
--- a/src/r_defs.h
+++ b/src/r_defs.h
@@ -657,9 +657,9 @@ public:
 		FTransform xform;
 		int Flags;
 		int Light;
-		fixed_t alpha;
+		double alpha;
 		FTextureID Texture;
-		fixed_t TexZ;
+		double TexZ;
 	};
 
 
@@ -747,19 +747,14 @@ public:
 
 	void SetAlpha(int pos, double o)
 	{
-		planes[pos].alpha = FLOAT2FIXED(o);
+		planes[pos].alpha = o;
 	}
 
-	fixed_t GetAlpha(int pos) const
+	double GetAlpha(int pos) const
 	{
 		return planes[pos].alpha;
 	}
 
-	double GetAlphaF(int pos) const
-	{
-		return FIXED2DBL(planes[pos].alpha);
-	}
-
 	int GetFlags(int pos) const
 	{
 		return planes[pos].Flags;
@@ -799,24 +794,19 @@ public:
 		if (floorclip && pos == floor && tex != old) AdjustFloorClip();
 	}
 
-	fixed_t GetPlaneTexZ(int pos) const
+	double GetPlaneTexZ(int pos) const
 	{
 		return planes[pos].TexZ;
 	}
 
-	double GetPlaneTexZF(int pos) const
-	{
-		return FIXED2DBL(planes[pos].TexZ);
-	}
-
 	void SetPlaneTexZ(int pos, double val)
 	{
-		planes[pos].TexZ = FLOAT2FIXED(val);
+		planes[pos].TexZ = val;
 	}
 
 	void ChangePlaneTexZ(int pos, double val)
 	{
-		planes[pos].TexZ += FLOAT2FIXED(val);
+		planes[pos].TexZ += val;
 	}
 
 	static inline short ClampLight(int level)
@@ -1218,8 +1208,8 @@ public:
 	DWORD		flags;
 	DWORD		activation;	// activation type
 	int			special;
-	fixed_t		Alpha;		// <--- translucency (0=invisibile, FRACUNIT=opaque)
 	int			args[5];	// <--- hexen-style arguments (expanded to ZDoom's full width)
+	double		alpha;		// <--- translucency (0=invisibile, FRACUNIT=opaque)
 	side_t		*sidedef[2];
 	double		bbox[4];	// bounding box, for the extent of the LineDef.
 	sector_t	*frontsector, *backsector;
@@ -1239,7 +1229,7 @@ public:
 
 	void setAlpha(double a)
 	{
-		Alpha = FLOAT2FIXED(a);
+		alpha = a;
 	}
 
 	FLinePortal *getPortal() const
diff --git a/src/r_plane.cpp b/src/r_plane.cpp
index b24148f3f..790bb9309 100644
--- a/src/r_plane.cpp
+++ b/src/r_plane.cpp
@@ -581,7 +581,7 @@ static visplane_t *new_visplane (unsigned hash)
 // killough 2/28/98: Add offsets
 //==========================================================================
 
-visplane_t *R_FindPlane (const secplane_t &height, FTextureID picnum, int lightlevel, fixed_t alpha, bool additive,
+visplane_t *R_FindPlane (const secplane_t &height, FTextureID picnum, int lightlevel, double Alpha, bool additive,
 						const FTransform &xform,
 						 int sky, FSectorPortal *portal)
 {
@@ -593,6 +593,7 @@ visplane_t *R_FindPlane (const secplane_t &height, FTextureID picnum, int lightl
 	fixed_t yoffs = FLOAT2FIXED(xform.yOffs + xform.baseyOffs);
 	fixed_t xscale = FLOAT2FIXED(xform.xScale);
 	fixed_t yscale = FLOAT2FIXED(xform.yScale);
+	fixed_t alpha = FLOAT2FIXED(Alpha);
 	angle_t angle = (xform.Angle + xform.baseAngle).BAMs();
 
 	if (picnum == skyflatnum)	// killough 10/98
diff --git a/src/r_plane.h b/src/r_plane.h
index 4e14d79c8..25e46de98 100644
--- a/src/r_plane.h
+++ b/src/r_plane.h
@@ -98,7 +98,7 @@ visplane_t *R_FindPlane
 ( const secplane_t &height,
   FTextureID	picnum,
   int			lightlevel,
-  fixed_t		alpha,
+  double		alpha,
   bool			additive,
   const FTransform &xform,
   int			sky,
diff --git a/src/r_segs.cpp b/src/r_segs.cpp
index 5f4baf220..696e30b7c 100644
--- a/src/r_segs.cpp
+++ b/src/r_segs.cpp
@@ -243,7 +243,7 @@ void R_RenderMaskedSegRange (drawseg_t *ds, int x1, int x2)
 	ESPSResult drawmode;
 
 	drawmode = R_SetPatchStyle (LegacyRenderStyles[curline->linedef->flags & ML_ADDTRANS ? STYLE_Add : STYLE_Translucent],
-		MIN<fixed_t>(curline->linedef->Alpha, OPAQUE),	0, 0);
+		(float)MIN(curline->linedef->alpha, 1.),	0, 0);
 
 	if ((drawmode == DontDraw && !ds->bFogBoundary && !ds->bFakeBoundary))
 	{
@@ -325,11 +325,11 @@ void R_RenderMaskedSegRange (drawseg_t *ds, int x1, int x2)
 	}
 	if (curline->linedef->flags & ML_DONTPEGBOTTOM)
 	{
-		dc_texturemid = MAX(frontsector->GetPlaneTexZF(sector_t::floor), backsector->GetPlaneTexZF(sector_t::floor)) + texheight;
+		dc_texturemid = MAX(frontsector->GetPlaneTexZ(sector_t::floor), backsector->GetPlaneTexZ(sector_t::floor)) + texheight;
 	}
 	else
 	{
-		dc_texturemid = MIN(frontsector->GetPlaneTexZF(sector_t::ceiling), backsector->GetPlaneTexZF(sector_t::ceiling));
+		dc_texturemid = MIN(frontsector->GetPlaneTexZ(sector_t::ceiling), backsector->GetPlaneTexZ(sector_t::ceiling));
 	}
 
 	rowoffset = curline->sidedef->GetTextureYOffset(side_t::mid);
@@ -603,7 +603,7 @@ void R_RenderFakeWall(drawseg_t *ds, int x1, int x2, F3DFloor *rover)
 	yscale = rw_pic->Scale.Y * scaledside->GetTextureYScale(scaledpart);
 
 	double rowoffset = curline->sidedef->GetTextureYOffset(side_t::mid) + rover->master->sidedef[0]->GetTextureYOffset(side_t::mid);
-	double planez = rover->model->GetPlaneTexZF(sector_t::ceiling);
+	double planez = rover->model->GetPlaneTexZ(sector_t::ceiling);
 	rw_offset = FLOAT2FIXED(curline->sidedef->GetTextureXOffset(side_t::mid) + rover->master->sidedef[0]->GetTextureXOffset(side_t::mid));
 	if (rowoffset < 0)
 	{
@@ -2035,11 +2035,11 @@ void R_NewWall (bool needlights)
 			{ // normal orientation
 				if (linedef->flags & ML_DONTPEGBOTTOM)
 				{ // bottom of texture at bottom
-					rw_midtexturemid = (frontsector->GetPlaneTexZF(sector_t::floor) - ViewPos.Z) * yrepeat + midtexture->GetHeight();
+					rw_midtexturemid = (frontsector->GetPlaneTexZ(sector_t::floor) - ViewPos.Z) * yrepeat + midtexture->GetHeight();
 				}
 				else
 				{ // top of texture at top
-					rw_midtexturemid = (frontsector->GetPlaneTexZF(sector_t::ceiling) - ViewPos.Z) * yrepeat;
+					rw_midtexturemid = (frontsector->GetPlaneTexZ(sector_t::ceiling) - ViewPos.Z) * yrepeat;
 					if (rowoffset < 0 && midtexture != NULL)
 					{
 						rowoffset += midtexture->GetHeight();
@@ -2051,11 +2051,11 @@ void R_NewWall (bool needlights)
 				rowoffset = -rowoffset;
 				if (linedef->flags & ML_DONTPEGBOTTOM)
 				{ // top of texture at bottom
-					rw_midtexturemid = (frontsector->GetPlaneTexZF(sector_t::floor) - ViewPos.Z) * yrepeat;
+					rw_midtexturemid = (frontsector->GetPlaneTexZ(sector_t::floor) - ViewPos.Z) * yrepeat;
 				}
 				else
 				{ // bottom of texture at top
-					rw_midtexturemid = (frontsector->GetPlaneTexZF(sector_t::ceiling) - ViewPos.Z) * yrepeat + midtexture->GetHeight();
+					rw_midtexturemid = (frontsector->GetPlaneTexZ(sector_t::ceiling) - ViewPos.Z) * yrepeat + midtexture->GetHeight();
 				}
 			}
 			if (midtexture->bWorldPanning)
@@ -2074,7 +2074,7 @@ void R_NewWall (bool needlights)
 	{ // two-sided line
 		// hack to allow height changes in outdoor areas
 
-		rw_frontlowertop = frontsector->GetPlaneTexZF(sector_t::ceiling);
+		rw_frontlowertop = frontsector->GetPlaneTexZ(sector_t::ceiling);
 
 		if (frontsector->GetTexture(sector_t::ceiling) == skyflatnum &&
 			backsector->GetTexture(sector_t::ceiling) == skyflatnum)
@@ -2095,7 +2095,7 @@ void R_NewWall (bool needlights)
 			}
 			// Putting sky ceilings on the front and back of a line alters the way unpegged
 			// positioning works.
-			rw_frontlowertop = backsector->GetPlaneTexZF(sector_t::ceiling);
+			rw_frontlowertop = backsector->GetPlaneTexZ(sector_t::ceiling);
 		}
 
 		if ((rw_backcz1 <= rw_frontfz1 && rw_backcz2 <= rw_frontfz2) ||
@@ -2179,7 +2179,7 @@ void R_NewWall (bool needlights)
 			{ // normal orientation
 				if (linedef->flags & ML_DONTPEGTOP)
 				{ // top of texture at top
-					rw_toptexturemid = (frontsector->GetPlaneTexZF(sector_t::ceiling) - ViewPos.Z) * yrepeat;
+					rw_toptexturemid = (frontsector->GetPlaneTexZ(sector_t::ceiling) - ViewPos.Z) * yrepeat;
 					if (rowoffset < 0 && toptexture != NULL)
 					{
 						rowoffset += toptexture->GetHeight();
@@ -2187,7 +2187,7 @@ void R_NewWall (bool needlights)
 				}
 				else
 				{ // bottom of texture at bottom
-					rw_toptexturemid = (backsector->GetPlaneTexZF(sector_t::ceiling) - ViewPos.Z) * yrepeat + toptexture->GetHeight();
+					rw_toptexturemid = (backsector->GetPlaneTexZ(sector_t::ceiling) - ViewPos.Z) * yrepeat + toptexture->GetHeight();
 				}
 			}
 			else
@@ -2195,11 +2195,11 @@ void R_NewWall (bool needlights)
 				rowoffset = -rowoffset;
 				if (linedef->flags & ML_DONTPEGTOP)
 				{ // bottom of texture at top
-					rw_toptexturemid = (frontsector->GetPlaneTexZF(sector_t::ceiling) - ViewPos.Z) * yrepeat + toptexture->GetHeight();
+					rw_toptexturemid = (frontsector->GetPlaneTexZ(sector_t::ceiling) - ViewPos.Z) * yrepeat + toptexture->GetHeight();
 				}
 				else
 				{ // top of texture at bottom
-					rw_toptexturemid = (backsector->GetPlaneTexZF(sector_t::ceiling) - ViewPos.Z) * yrepeat;
+					rw_toptexturemid = (backsector->GetPlaneTexZ(sector_t::ceiling) - ViewPos.Z) * yrepeat;
 				}
 			}
 			if (toptexture->bWorldPanning)
@@ -2228,7 +2228,7 @@ void R_NewWall (bool needlights)
 				}
 				else
 				{ // top of texture at top
-					rw_bottomtexturemid = (backsector->GetPlaneTexZF(sector_t::floor) - ViewPos.Z) * yrepeat;
+					rw_bottomtexturemid = (backsector->GetPlaneTexZ(sector_t::floor) - ViewPos.Z) * yrepeat;
 					if (rowoffset < 0 && bottomtexture != NULL)
 					{
 						rowoffset += bottomtexture->GetHeight();
@@ -2244,7 +2244,7 @@ void R_NewWall (bool needlights)
 				}
 				else
 				{ // bottom of texture at top
-					rw_bottomtexturemid = (backsector->GetPlaneTexZF(sector_t::floor) - ViewPos.Z) * yrepeat + bottomtexture->GetHeight();
+					rw_bottomtexturemid = (backsector->GetPlaneTexZ(sector_t::floor) - ViewPos.Z) * yrepeat + bottomtexture->GetHeight();
 				}
 			}
 			if (bottomtexture->bWorldPanning)
@@ -3047,31 +3047,31 @@ static void R_RenderDecal (side_t *wall, DBaseDecal *decal, drawseg_t *clipper,
 	case RF_RELUPPER:
 		if (curline->linedef->flags & ML_DONTPEGTOP)
 		{
-			zpos = decal->Z + front->GetPlaneTexZF(sector_t::ceiling);
+			zpos = decal->Z + front->GetPlaneTexZ(sector_t::ceiling);
 		}
 		else
 		{
-			zpos = decal->Z + back->GetPlaneTexZF(sector_t::ceiling);
+			zpos = decal->Z + back->GetPlaneTexZ(sector_t::ceiling);
 		}
 		break;
 	case RF_RELLOWER:
 		if (curline->linedef->flags & ML_DONTPEGBOTTOM)
 		{
-			zpos = decal->Z + front->GetPlaneTexZF(sector_t::ceiling);
+			zpos = decal->Z + front->GetPlaneTexZ(sector_t::ceiling);
 		}
 		else
 		{
-			zpos = decal->Z + back->GetPlaneTexZF(sector_t::floor);
+			zpos = decal->Z + back->GetPlaneTexZ(sector_t::floor);
 		}
 		break;
 	case RF_RELMID:
 		if (curline->linedef->flags & ML_DONTPEGBOTTOM)
 		{
-			zpos = decal->Z + front->GetPlaneTexZF(sector_t::floor);
+			zpos = decal->Z + front->GetPlaneTexZ(sector_t::floor);
 		}
 		else
 		{
-			zpos = decal->Z + front->GetPlaneTexZF(sector_t::ceiling);
+			zpos = decal->Z + front->GetPlaneTexZ(sector_t::ceiling);
 		}
 	}
 
diff --git a/src/version.h b/src/version.h
index 0ae0951e2..91ccc3e99 100644
--- a/src/version.h
+++ b/src/version.h
@@ -72,11 +72,11 @@ const char *GetVersionString();
 // SAVESIG should match SAVEVER.
 
 // MINSAVEVER is the minimum level snapshot version that can be loaded.
-#define MINSAVEVER	4542
+#define MINSAVEVER	4543
 
 // Use 4500 as the base git save version, since it's higher than the
 // SVN revision ever got.
-#define SAVEVER 4542
+#define SAVEVER 4543
 
 #define SAVEVERSTRINGIFY2(x) #x
 #define SAVEVERSTRINGIFY(x) SAVEVERSTRINGIFY2(x)