diff --git a/source/games/duke/src/actors_r.cpp b/source/games/duke/src/actors_r.cpp
index 8a98b684e..5d798e588 100644
--- a/source/games/duke/src/actors_r.cpp
+++ b/source/games/duke/src/actors_r.cpp
@@ -1862,8 +1862,8 @@ void destroyit(DDukeActor *actor)
 				auto srcwal = srcsect->walls.Data();
 				for (unsigned i = 0; i < destsect->walls.Size(); i++, srcwal++, destwal++)
 				{
-					destwal->wallpicnum = srcwal->wallpicnum;
-					destwal->overpicnum = srcwal->overpicnum;
+					destwal->setwalltexture(srcwal->walltexture());
+					destwal->setovertexture(srcwal->overtexture());
 					destwal->shade = srcwal->shade;
 					destwal->xrepeat = srcwal->xrepeat;
 					destwal->yrepeat = srcwal->yrepeat;
diff --git a/source/games/duke/src/constants.h b/source/games/duke/src/constants.h
index b8d84dd9e..5ffc6d580 100644
--- a/source/games/duke/src/constants.h
+++ b/source/games/duke/src/constants.h
@@ -422,6 +422,7 @@ enum
 	TFLAG_BLOCKDOOR				= 1 << 4,
 	TFLAG_NOBLOODSPLAT			= 1 << 5,
 	TFLAG_NOCIRCLEREFLECT		= 1 << 6,
+	TFLAG_INTERPOLATEWALL		= 1 << 7,
 };
 
 enum
diff --git a/source/games/duke/src/game.cpp b/source/games/duke/src/game.cpp
index 5b545ca8e..d91066046 100644
--- a/source/games/duke/src/game.cpp
+++ b/source/games/duke/src/game.cpp
@@ -565,13 +565,13 @@ void CallStandingOn(DDukeActor* actor, player_struct* p)
 CCMD(changewalltexture)
 {
 	if (argv.argc() < 2) return;
-	int tile = tileForName(argv[1]);
-	if (tile < 0) tile = (int)strtol(argv[1], nullptr, 10);
+	FTextureID tile = TexMan.CheckForTexture(argv[1], ETextureType::Any);
+	if (!tile.isValid()) tile = tileGetTextureID((int)strtol(argv[1], nullptr, 10));
 	HitInfoBase hit;
 	hitscan(ps[0].actor->spr.pos, ps[0].cursector, DVector3(ps[0].actor->spr.Angles.Yaw.ToVector(), 0) * 1024, hit, CLIPMASK1);
 	if (hit.hitWall)
 	{
-		hit.hitWall->wallpicnum = tile;
+		hit.hitWall->setwalltexture(tile);
 	}
 }
 
diff --git a/source/games/duke/src/premap.cpp b/source/games/duke/src/premap.cpp
index 24f73428a..77230886c 100644
--- a/source/games/duke/src/premap.cpp
+++ b/source/games/duke/src/premap.cpp
@@ -1090,7 +1090,7 @@ void enterlevel(MapRecord *mi, int gamemode)
 	{
 		for (auto& wal : wall)
 		{
-			if (wal.wallpicnum == 7873 || wal.wallpicnum == 7870)
+			if (tileflags(wal.walltexture()) & TFLAG_INTERPOLATEWALL)
 				StartInterpolation(&wal, Interp_Wall_PanX);
 		}
 	}
diff --git a/source/games/exhumed/src/aistuff.h b/source/games/exhumed/src/aistuff.h
index 6dfd8bce8..882c24f13 100644
--- a/source/games/exhumed/src/aistuff.h
+++ b/source/games/exhumed/src/aistuff.h
@@ -283,7 +283,7 @@ void BuildDrip(DExhumedActor* nSprite);
 DExhumedActor* BuildEnergyBlock(sectortype* pSector);
 int BuildElevC(int arg1, int nChannel, sectortype* pSector, DExhumedActor* nWallSprite, int arg5, int arg6, int nCount, ...);
 int BuildElevF(int nChannel, sectortype* pSector, DExhumedActor* nWallSprite, int arg_4, int arg_5, int nCount, ...);
-int BuildWallFace(int nChannel, walltype* pWall, int nCount, ...);
+int BuildWallFace(int nChannel, walltype* pWall, FTextureID pic);
 int BuildSlide(int nChannel, walltype* edx, walltype* ebx, walltype* ecx, walltype* arg1, walltype* arg2, walltype* arg3);
 
 // queen
diff --git a/source/games/exhumed/src/bullet.cpp b/source/games/exhumed/src/bullet.cpp
index 3ec551ce9..782ebd6e0 100644
--- a/source/games/exhumed/src/bullet.cpp
+++ b/source/games/exhumed/src/bullet.cpp
@@ -465,7 +465,7 @@ HITSPRITE:
         else if (pHitWall != nullptr)
         {
         HITWALL:
-            if (pHitWall->wallpicnum == kEnergy1)
+            if (pHitWall->walltexture() == tileGetTextureID(kEnergy1))
             {
                 if (pHitWall->twoSided())
                 {
diff --git a/source/games/exhumed/src/lighting.cpp b/source/games/exhumed/src/lighting.cpp
index 3304601c9..b4b2c4f3d 100644
--- a/source/games/exhumed/src/lighting.cpp
+++ b/source/games/exhumed/src/lighting.cpp
@@ -718,8 +718,6 @@ void AddFlow(walltype* pWall, int nSpeed, int b)
     // only moves up or down
     StartInterpolation(pWall, Interp_Wall_PanY);
 
-    int nPic = pWall->wallpicnum;
-
     sFlowInfo[nFlow].angcos = 0;
     sFlowInfo[nFlow].angsin = b == 2 ? 1.f : -1.f;
     sFlowInfo[nFlow].pWall = pWall;
diff --git a/source/games/exhumed/src/object.cpp b/source/games/exhumed/src/object.cpp
index c2a6b3a04..f77aa74c7 100644
--- a/source/games/exhumed/src/object.cpp
+++ b/source/games/exhumed/src/object.cpp
@@ -104,7 +104,7 @@ struct wallFace
     walltype* pWall;
     int16_t nChannel;
     int16_t count;
-    int16_t piclist[8];
+    FTextureID picList[2];
 };
 
 struct slideData
@@ -136,8 +136,8 @@ struct Trap
 
     int16_t nState;
     int16_t nType;
-    int16_t nPicnum1;
-    int16_t nPicnum2;
+    FTextureID nPicnum1;
+    FTextureID nPicnum2;
     int16_t nTrapInterval;
 
 };
@@ -269,8 +269,8 @@ FSerializer& Serialize(FSerializer& arc, const char* keyname, wallFace& w, wallF
     {
         arc("channel", w.nChannel)
             ("wall", w.pWall)
-            ("at4", w.count)
-            .Array("at6", w.piclist, 8)
+            ("count", w.count)
+            .Array("piclist", w.picList, 2)
             .EndObject();
     }
     return arc;
@@ -919,7 +919,7 @@ void InitWallFace()
 //
 //---------------------------------------------------------------------------
 
-int BuildWallFace(int nChannel, walltype* pWall, int nCount, ...)
+int BuildWallFace(int nChannel, walltype* pWall, FTextureID pic)
 {
     auto WallFaceCount = WallFace.Reserve(1);
 
@@ -927,21 +927,13 @@ int BuildWallFace(int nChannel, walltype* pWall, int nCount, ...)
     WallFace[WallFaceCount].pWall = pWall;
     WallFace[WallFaceCount].nChannel = nChannel;
 
-    if (nCount > 8) {
-        nCount = 8;
-    }
-
-    va_list piclist;
-    va_start(piclist, nCount);
-
-    while (WallFace[WallFaceCount].count < nCount)
+    while (WallFace[WallFaceCount].count < 2)
     {
         int i = WallFace[WallFaceCount].count;
         WallFace[WallFaceCount].count++;
 
-        WallFace[WallFaceCount].piclist[i] = (int16_t)va_arg(piclist, int);
+        WallFace[WallFaceCount].picList[i] = pic + i;
     }
-    va_end(piclist);
 
     return WallFaceCount;
 }
@@ -963,7 +955,7 @@ void AIWallFace::ProcessChannel(RunListEvent* ev)
 
     if ((si <= WallFace[nWallFace].count) && (si >= 0))
     {
-        WallFace[nWallFace].pWall->wallpicnum = WallFace[nWallFace].piclist[si];
+        WallFace[nWallFace].pWall->setwalltexture(WallFace[nWallFace].picList[si]);
     }
 }
 
@@ -1241,8 +1233,8 @@ int BuildTrap(DExhumedActor* pActor, int edx, int ebx, int ecx)
         sTrap[nTrap].nTrapInterval = 5;
     }
 
-    sTrap[nTrap].nPicnum2 = 0;
-    sTrap[nTrap].nPicnum1 = 0;
+    sTrap[nTrap].nPicnum2 = FNullTextureID();
+    sTrap[nTrap].nPicnum1 = FNullTextureID();
 
     if (var_18 == -1) {
         return nTrap;
@@ -1257,13 +1249,13 @@ int BuildTrap(DExhumedActor* pActor, int edx, int ebx, int ecx)
             if (sTrap[nTrap].pWall1 != nullptr)
             {
                 sTrap[nTrap].pWall2 = &wal;
-                sTrap[nTrap].nPicnum2 = wal.wallpicnum;
+                sTrap[nTrap].nPicnum2 = wal.walltexture();
                 break;
             }
             else
             {
                 sTrap[nTrap].pWall1 = &wal;
-                sTrap[nTrap].nPicnum1 = wal.wallpicnum;
+                sTrap[nTrap].nPicnum1 = wal.walltexture();
             }
         }
     }
@@ -1322,13 +1314,13 @@ void AITrap::Tick(RunListEvent* ev)
                 auto pWall = sTrap[nTrap].pWall1;
                 if (pWall)
                 {
-                    pWall->wallpicnum = sTrap[nTrap].nPicnum1;
+                    pWall->setwalltexture(sTrap[nTrap].nPicnum1);
                 }
 
                 pWall = sTrap[nTrap].pWall1;
                 if (pWall)
                 {
-                    pWall->wallpicnum = sTrap[nTrap].nPicnum2;
+                    pWall->setwalltexture(sTrap[nTrap].nPicnum2);
                 }
             }
         }
@@ -1354,13 +1346,13 @@ void AITrap::Tick(RunListEvent* ev)
                     auto pWall = sTrap[nTrap].pWall1;
                     if (pWall)
                     {
-                        pWall->wallpicnum = sTrap[nTrap].nPicnum1 + 1;
+                        pWall->setwalltexture(sTrap[nTrap].nPicnum1 + 1);
                     }
 
                     pWall = sTrap[nTrap].pWall2;
                     if (pWall)
                     {
-                        pWall->wallpicnum = sTrap[nTrap].nPicnum2;
+                        pWall->setwalltexture(sTrap[nTrap].nPicnum2);
                     }
 
                     D3PlayFX(StaticSound[kSound36], pBullet);
@@ -1621,7 +1613,7 @@ DExhumedActor* BuildEnergyBlock(sectortype* pSector)
     {
 		apos += wal.pos;
 		
-        wal.wallpicnum = kClockSymbol16;
+        wal.setwalltexture(TexMan.CheckForTexture("ClockSymbol16", ETextureType::Any));
         wal.pal = 0;
         wal.shade = 50;
     }
@@ -2619,6 +2611,7 @@ void PostProcess()
     }
     else // nMap == kMap20)
     {
+        auto texid3603 = tileGetTextureID(kTile3603);
         for(auto& sect: sector)
         {
             sect.pSoundSect = &sect;
@@ -2626,7 +2619,7 @@ void PostProcess()
 
             for(auto& wal : sect.walls)
             {
-                if (wal.wallpicnum == kTile3603)
+                if (wal.walltexture() == texid3603)
                 {
                     wal.pal = 1;
                     auto pActor = insertActor(&sect, 407);
@@ -2638,7 +2631,7 @@ void PostProcess()
         ExhumedSpriteIterator it;
         while (auto act = it.Next())
         {
-            if (act->spr.statnum < kMaxStatus && act->spr.picnum == kTile3603)
+            if (act->spr.statnum < kMaxStatus && act->spr.spritetexture() == texid3603)
             {
                 ChangeActorStat(act, 407);
                 act->spr.pal = 1;
diff --git a/source/games/exhumed/src/runlist.cpp b/source/games/exhumed/src/runlist.cpp
index 4c7dba2b5..fed940149 100644
--- a/source/games/exhumed/src/runlist.cpp
+++ b/source/games/exhumed/src/runlist.cpp
@@ -1625,7 +1625,7 @@ void runlist_ProcessWallTag(walltype* pWall, int nLotag, int nHitag)
 
         case 1:
         {
-            int nWallFace = BuildWallFace(nChannel, pWall, 2, pWall->wallpicnum, pWall->wallpicnum + 1);
+            int nWallFace = BuildWallFace(nChannel, pWall, pWall->walltexture());
             runlist_AddRunRec(sRunChannels[nChannel].a, nWallFace,  0x70000);
 
             auto nSwitch = BuildSwPressWall(nChannel, BuildLink(2, nEffectTag, 0), pWall);
@@ -1643,7 +1643,7 @@ void runlist_ProcessWallTag(walltype* pWall, int nLotag, int nHitag)
 
         case 7: // Regular switch
         {
-            int nWallFace = BuildWallFace(nChannel, pWall, 2, pWall->wallpicnum, pWall->wallpicnum + 1);
+            int nWallFace = BuildWallFace(nChannel, pWall, pWall->walltexture());
             runlist_AddRunRec(sRunChannels[nChannel].a, nWallFace,  0x70000);
 
             auto nSwitch = BuildSwPressWall(nChannel, BuildLink(1, 1), pWall);
@@ -1653,7 +1653,7 @@ void runlist_ProcessWallTag(walltype* pWall, int nLotag, int nHitag)
 
         case 8: // Reverse switch
         {
-            int nWallFace = BuildWallFace(nChannel, pWall, 2, pWall->wallpicnum, pWall->wallpicnum + 1);
+            int nWallFace = BuildWallFace(nChannel, pWall, pWall->walltexture());
             runlist_AddRunRec(sRunChannels[nChannel].a, nWallFace,  0x70000);
 
             auto nSwitch = BuildSwPressWall(nChannel, BuildLink(2, -1, 0), pWall);
diff --git a/source/games/sw/src/break.cpp b/source/games/sw/src/break.cpp
index af2b9488d..c0b920d0b 100644
--- a/source/games/sw/src/break.cpp
+++ b/source/games/sw/src/break.cpp
@@ -639,7 +639,7 @@ int AutoBreakWall(walltype* wallp, const DVector3& hit_pos, DAngle ang, int type
     else
     {
         if (break_info->breaknum == -1)
-            wallp->wallpicnum = 594; // temporary break pic
+            wallp->setwalltexture(FNullTextureID()); // temporary break pic
         else
         {
             wallp->wallpicnum = break_info->breaknum;
@@ -681,7 +681,7 @@ bool UserBreakWall(walltype* wp)
         return true;
     }
 
-    if (wp->wallpicnum == SP_TAG5(actor))
+    if (wp->walltexture() == actor->texparam)
         return true;
 
     // make it BROKEN
@@ -692,7 +692,7 @@ bool UserBreakWall(walltype* wp)
 
         if (SP_TAG8(actor) == 0)
         {
-            wp->wallpicnum = SP_TAG5(actor);
+            wp->setwalltexture(actor->texparam);
             // clear tags
             wp->hitag = wp->lotag = 0;
             if (wp->twoSided())
@@ -715,7 +715,7 @@ bool UserBreakWall(walltype* wp)
         else if (SP_TAG8(actor) == 2)
         {
             // set to broken pic
-            wp->wallpicnum = SP_TAG5(actor);
+            wp->setwalltexture(actor->texparam);
 
             // clear flags
             wp->cstat &= ~(block_flags);
@@ -735,7 +735,7 @@ bool UserBreakWall(walltype* wp)
     else
     {
         // increment picnum
-        wp->wallpicnum++;
+        wp->setwalltexture(wp->walltexture() + 1);
 
         DoSpawnSpotsForDamage(match);
     }
diff --git a/source/games/sw/src/copysect.cpp b/source/games/sw/src/copysect.cpp
index 8669b78ea..4319718e6 100644
--- a/source/games/sw/src/copysect.cpp
+++ b/source/games/sw/src/copysect.cpp
@@ -77,10 +77,10 @@ void CopySectorWalls(sectortype* dest_sect, sectortype* src_sect)
         {
             auto const dest_nextwall = dwall->nextWall();
             auto const src_nextwall = swall->nextWall();
-            dest_nextwall->wallpicnum = src_nextwall->wallpicnum;
+            dest_nextwall->setwalltexture(src_nextwall->walltexture());
             dest_nextwall->xrepeat = src_nextwall->xrepeat;
             dest_nextwall->yrepeat = src_nextwall->yrepeat;
-            dest_nextwall->overpicnum = src_nextwall->overpicnum;
+            dest_nextwall->setovertexture(src_nextwall->overtexture());
             dest_nextwall->pal = src_nextwall->pal;
             dest_nextwall->cstat = src_nextwall->cstat;
             dest_nextwall->shade = src_nextwall->shade;
diff --git a/source/games/sw/src/jsector.cpp b/source/games/sw/src/jsector.cpp
index e6f5fc9f8..6575c6237 100644
--- a/source/games/sw/src/jsector.cpp
+++ b/source/games/sw/src/jsector.cpp
@@ -375,17 +375,6 @@ void JS_InitMirrors(void)
                 wal.overpicnum = legacyTileNum(sec->ceilingtexture);
         }
     }
-
-    // Invalidate textures in sector behind mirror
-    for (i = 0; i < mirrorcnt; i++)
-    {
-        for (auto& wal : mirror[i].mirrorSector->walls)
-        {
-            wal.wallpicnum = MIRROR;
-            wal.overpicnum = MIRROR;
-        }
-    }
-
 }                                   // InitMirrors
 
 /////////////////////////////////////////////////////
diff --git a/source/games/sw/src/save.cpp b/source/games/sw/src/save.cpp
index c68c6ecb9..8e9ceaac0 100644
--- a/source/games/sw/src/save.cpp
+++ b/source/games/sw/src/save.cpp
@@ -1086,7 +1086,8 @@ void DSWActor::Serialize(FSerializer& arc)
 	arc("hasuser", hasUser)
 		("tempwall", tempwall)
 		("owner", ownerActor)
-		("texparam", texparam);
+		("texparam", texparam)
+		("texparam2", texparam2);
 	if (hasUser) arc("user", user); // only write if defined.
 }
 
diff --git a/source/games/sw/src/sprite.cpp b/source/games/sw/src/sprite.cpp
index a6b7392c4..86074214e 100644
--- a/source/games/sw/src/sprite.cpp
+++ b/source/games/sw/src/sprite.cpp
@@ -1879,6 +1879,8 @@ void SpriteSetup(void)
 
                 case BREAKABLE:
                     // used for wall info
+                    if (SP_TAG5(actor) >= 0 && !actor->texparam.isValid()) actor->texparam = tileGetTextureID(SP_TAG5(actor));
+
                     change_actor_stat(actor, STAT_BREAKABLE);
                     break;
 
@@ -2009,8 +2011,7 @@ void SpriteSetup(void)
                     // copy tag 7 to tag 6 and pre-shift it
                     SP_TAG6(actor) = SP_TAG7(actor);
                     SP_TAG6(actor) <<= 7;
-                    if (SP_TAG2(actor) >= 0)
-                        actor->texparam = tileGetTextureID(SP_TAG2(actor)); // convert and copy to a safe place. A new map format cannot use the lotag to hold a named texture.
+                    if (SP_TAG2(actor) >= 0 && !actor->texparam.isValid()) actor->texparam = tileGetTextureID(SP_TAG2(actor));
                     change_actor_stat(actor, STAT_CEILING_FLOOR_PIC_OVERRIDE);
                     break;
                 }
@@ -2024,8 +2025,7 @@ void SpriteSetup(void)
 
                 case SECT_CHANGOR:
                 {
-                    if (SP_TAG4(actor) >= 0)
-                        actor->texparam = tileGetTextureID(SP_TAG4(actor)); // convert and copy to a safe place. A new map format cannot use the lotag to hold a named texture.
+                    if (SP_TAG4(actor) >= 0 && !actor->texparam.isValid()) actor->texparam = tileGetTextureID(SP_TAG4(actor));
                     change_actor_stat(actor, STAT_CHANGOR);
                     break;
                 }
@@ -2532,6 +2532,8 @@ void SpriteSetup(void)
 
 
                 case SECT_WALL_MOVE:
+                    if (SP_TAG5(actor) >= 0 && !actor->texparam.isValid()) actor->texparam = tileGetTextureID(SP_TAG5(actor));
+                    if (SP_TAG6(actor) >= 0 && !actor->texparam.isValid()) actor->texparam2 = tileGetTextureID(SP_TAG6(actor));
                     change_actor_stat(actor, STAT_WALL_MOVE);
                     break;
                 case SECT_WALL_MOVE_CANSEE:
@@ -6096,7 +6098,7 @@ int  StateControl(DSWActor* actor)
         if ((actor->user.State->Tics & SF_WALL_STATE))
         {
             ASSERT(actor->user.WallP);
-            actor->user.WallP->wallpicnum = actor->user.State->Pic;
+            actor->user.WallP->setwalltexture(tileGetTextureID(actor->user.State->Pic));
         }
         else
         {
diff --git a/source/games/sw/src/swactor.h b/source/games/sw/src/swactor.h
index a92b9ff17..ac85ae766 100644
--- a/source/games/sw/src/swactor.h
+++ b/source/games/sw/src/swactor.h
@@ -16,7 +16,7 @@ public:
 	USER user;
 	walltype* tempwall;	// transient, to replace a hack using a 16 bit sprite field.
 	TObjPtr<DSWActor*> ownerActor;
-	FTextureID texparam;	// only one special variant of ST1 needs this...
+	FTextureID texparam, texparam2;	// some special variants of ST1 need this...
 
 	DSWActor() = default;
 
diff --git a/source/games/sw/src/wallmove.cpp b/source/games/sw/src/wallmove.cpp
index 2d7db9cfa..6150bc2cf 100644
--- a/source/games/sw/src/wallmove.cpp
+++ b/source/games/sw/src/wallmove.cpp
@@ -88,14 +88,15 @@ void SOwallmove(SECTOR_OBJECT* sop, DSWActor* actor, walltype* find_wallp, doubl
 
 int DoWallMove(DSWActor* actor)
 {
-    short shade1,shade2,picnum1,picnum2;
+    short shade1, shade2;
+    FTextureID texid1, texid2;
     bool found = false;
     bool SOsprite = false;
 
     double dist = SP_TAG13(actor) * maptoworld;
     DAngle ang = mapangle(SP_TAG4(actor));
-    picnum1 = SP_TAG5(actor);
-    picnum2 = SP_TAG6(actor);
+    texid1 = actor->texparam;
+    texid2 = actor->texparam2;
     shade1 = SP_TAG7(actor);
     shade2 = SP_TAG8(actor);
     int dang = ((int)SP_TAG10(actor)) << 3;
@@ -127,15 +128,15 @@ int DoWallMove(DSWActor* actor)
 
             if (shade1)
                 wal.shade = int8_t(shade1);
-            if (picnum1)
-                wal.wallpicnum = picnum1;
+            if (texid1.isValid())
+                wal.setwalltexture(texid1);
 
             // find the previous wall
             auto prev_wall = PrevWall(&wal);
             if (shade2)
                 prev_wall->shade = int8_t(shade2);
-            if (picnum2)
-                prev_wall->wallpicnum = picnum2;
+            if (texid2.isValid())
+                prev_wall->setwalltexture(texid2);
         }
     }
 
diff --git a/wadsrc/static/filter/dukeengine/constants.mi b/wadsrc/static/filter/dukeengine/constants.mi
index 77571b5d3..f3ce9f16b 100644
--- a/wadsrc/static/filter/dukeengine/constants.mi
+++ b/wadsrc/static/filter/dukeengine/constants.mi
@@ -10,6 +10,7 @@ constants
 	TFLAG_BLOCKDOOR				= 16
 	TFLAG_NOBLOODSPLAT			= 32
 	TFLAG_NOCIRCLEREFLECT		= 64
+	TFLAG_INTERPOLATEWALL		= 128
 
 	// surface (terrain/environment) types
 	TSURF_NONE					= 0
diff --git a/wadsrc/static/filter/redneck.ridesagain/rmapinfo.texflags b/wadsrc/static/filter/redneck.ridesagain/rmapinfo.texflags
index ee37fc54f..f08c395c6 100644
--- a/wadsrc/static/filter/redneck.ridesagain/rmapinfo.texflags
+++ b/wadsrc/static/filter/redneck.ridesagain/rmapinfo.texflags
@@ -32,6 +32,8 @@ textureflags
 		RRTILE8380,
 		RRTILE8565,
 		RRTILE8605
+		
+	TFLAG_INTERPOLATEWALL = RRTILE7873, RRTILE7870
 }
 
 surfacetypes