diff --git a/polymer/eduke32/build/include/build.h b/polymer/eduke32/build/include/build.h
index 06b36da07..5924fa110 100644
--- a/polymer/eduke32/build/include/build.h
+++ b/polymer/eduke32/build/include/build.h
@@ -324,7 +324,7 @@ typedef struct
     Tracker(Sector, int16_t) floorpicnum, floorheinum;
     Tracker(Sector, int8_t) floorshade;
     Tracker(Sector, uint8_t) floorpal, floorxpanning, floorypanning;
-    Tracker(Sector, uint8_t) /*CM_CEILINGZ:*/ visibility, filler;
+    Tracker(Sector, uint8_t) /*CM_CEILINGZ:*/ visibility, fogpal;
     Tracker(Sector, uint16_t) lotag, hitag;
     Tracker(Sector, int16_t) extra;
 } sectortypev7;
@@ -425,7 +425,7 @@ typedef struct
     Tracker(Sector, int8_t) floorshade;
     Tracker(Sector, uint8_t) floorpal, floorxpanning, floorypanning;
 
-    Tracker(Sector, uint8_t) /*CM_CEILINGZ:*/ visibility, filler;
+    Tracker(Sector, uint8_t) /*CM_CEILINGZ:*/ visibility, fogpal;
     Tracker(Sector, uint16_t) lotag, hitag;
     Tracker(Sector, int16_t) extra;
 } sectortypevx;
diff --git a/polymer/eduke32/build/include/polymost.h b/polymer/eduke32/build/include/polymost.h
index e13f33a67..8d729d08b 100644
--- a/polymer/eduke32/build/include/polymost.h
+++ b/polymer/eduke32/build/include/polymost.h
@@ -77,15 +77,15 @@ static inline float getshadefactor(int32_t shade)
     return ((float)(numshades-clamped_shade))/(float)numshades;
 }
 
-#define POLYMOST_CHOOSE_FOG_PAL(filler, pal) \
-    ((filler) ? (filler) : (pal))
+#define POLYMOST_CHOOSE_FOG_PAL(fogpal, pal) \
+    ((fogpal) ? (fogpal) : (pal))
 static inline int32_t get_floor_fogpal(const sectortype *sec)
 {
-    return POLYMOST_CHOOSE_FOG_PAL(sec->filler, sec->floorpal);
+    return POLYMOST_CHOOSE_FOG_PAL(sec->fogpal, sec->floorpal);
 }
 static inline int32_t get_ceiling_fogpal(const sectortype *sec)
 {
-    return POLYMOST_CHOOSE_FOG_PAL(sec->filler, sec->ceilingpal);
+    return POLYMOST_CHOOSE_FOG_PAL(sec->fogpal, sec->ceilingpal);
 }
 
 typedef struct pthtyp_t
diff --git a/polymer/eduke32/build/src/engine.c b/polymer/eduke32/build/src/engine.c
index b064fc2d5..50e2a2681 100644
--- a/polymer/eduke32/build/src/engine.c
+++ b/polymer/eduke32/build/src/engine.c
@@ -1337,7 +1337,7 @@ static spritetype *loadsprite;
 #define CM_CSTAT hitag
 #define CM_ANG extra
 #define CM_FLOORZ(Sec) (*(int32_t *)&sector[Sec].ceilingxpanning)  // ceilingxpanning,ceilingypanning,floorpicnum
-#define CM_CEILINGZ(Sec) (*(int32_t *)&sector[Sec].visibility)  // visibility,filler,lotag
+#define CM_CEILINGZ(Sec) (*(int32_t *)&sector[Sec].visibility)  // visibility,fogpal,lotag
 
 // backup of original normalized coordinates
 #define CM_WALL_X(Wal) (*(int32_t *)&wall[Wal].picnum)  // picnum, overpicnum
diff --git a/polymer/eduke32/build/src/engine_oldmap.h b/polymer/eduke32/build/src/engine_oldmap.h
index 415452bfe..02d521a7f 100644
--- a/polymer/eduke32/build/src/engine_oldmap.h
+++ b/polymer/eduke32/build/src/engine_oldmap.h
@@ -200,7 +200,7 @@ static void convertv6sectv7(struct sectortypev6 *from, sectortype *to)
     to->ceilingstat = from->ceilingstat;
     to->floorstat = from->floorstat;
     to->visibility = from->visibility;
-    to->filler = 0;
+    to->fogpal = 0;
     to->lotag = from->lotag;
     to->hitag = from->hitag;
     to->extra = from->extra;
diff --git a/polymer/eduke32/build/src/polymost.c b/polymer/eduke32/build/src/polymost.c
index adce00238..5880aff3b 100644
--- a/polymer/eduke32/build/src/polymost.c
+++ b/polymer/eduke32/build/src/polymost.c
@@ -2367,7 +2367,7 @@ static void polymost_drawalls(int32_t bunch)
 
         dapskyoff = getpsky(globalpicnum, NULL, &dapskybits);
 
-        global_cf_fogpal = sec->filler;
+        global_cf_fogpal = sec->fogpal;
         global_cf_shade = sec->floorshade, global_cf_pal = sec->floorpal; global_cf_z = sec->floorz;  // REFACT
         global_cf_xpanning = sec->floorxpanning; global_cf_ypanning = sec->floorypanning, global_cf_heinum = sec->floorheinum;
         global_getzofslope_func = &getflorzofslope;
@@ -2635,7 +2635,7 @@ static void polymost_drawalls(int32_t bunch)
 
         dapskyoff = getpsky(globalpicnum, NULL, &dapskybits);
 
-        global_cf_fogpal = sec->filler;
+        global_cf_fogpal = sec->fogpal;
         global_cf_shade = sec->ceilingshade, global_cf_pal = sec->ceilingpal; global_cf_z = sec->ceilingz;  // REFACT
         global_cf_xpanning = sec->ceilingxpanning; global_cf_ypanning = sec->ceilingypanning, global_cf_heinum = sec->ceilingheinum;
         global_getzofslope_func = &getceilzofslope;
diff --git a/polymer/eduke32/source/gamedef.c b/polymer/eduke32/source/gamedef.c
index 529d91948..d2d0541d1 100644
--- a/polymer/eduke32/source/gamedef.c
+++ b/polymer/eduke32/source/gamedef.c
@@ -723,8 +723,8 @@ const memberlabel_t SectorLabels[]=
     { "floorxpanning", SECTOR_FLOORXPANNING, 0, 0 },
     { "floorypanning", SECTOR_FLOORYPANNING, 0, 0 },
     { "visibility", SECTOR_VISIBILITY, 0, 0 },
-//    { "filler", SECTOR_ALIGNTO, 0, 0 },
-    { "alignto", SECTOR_ALIGNTO, 0, 0 }, // aka filler, not used
+    { "fogpal", SECTOR_FOGPAL, 0, 0 }, // formerly filler
+    { "alignto", SECTOR_FOGPAL, 0, 0 }, // formerly filler
     { "lotag", SECTOR_LOTAG, 0, 0 },
     { "hitag", SECTOR_HITAG, 0, 0 },
     { "extra", SECTOR_EXTRA, 0, 0 },
diff --git a/polymer/eduke32/source/gamedef.h b/polymer/eduke32/source/gamedef.h
index dfcc49b64..d92a72671 100644
--- a/polymer/eduke32/source/gamedef.h
+++ b/polymer/eduke32/source/gamedef.h
@@ -427,7 +427,7 @@ enum SectorLabel_t
     SECTOR_FLOORXPANNING,
     SECTOR_FLOORYPANNING,
     SECTOR_VISIBILITY,
-    SECTOR_ALIGNTO,
+    SECTOR_FOGPAL,
     SECTOR_LOTAG,
     SECTOR_HITAG,
     SECTOR_EXTRA,
diff --git a/polymer/eduke32/source/gamestructures.c b/polymer/eduke32/source/gamestructures.c
index a77b52e02..0478c192c 100644
--- a/polymer/eduke32/source/gamestructures.c
+++ b/polymer/eduke32/source/gamestructures.c
@@ -2362,13 +2362,13 @@ static void __fastcall VM_AccessSector(int32_t iSet, int32_t lVar1, int32_t lLab
         Gv_SetVarX(lVar2, sector[iSector].visibility);
         return;
 
-    case SECTOR_ALIGNTO:
+    case SECTOR_FOGPAL:
         if (iSet)
         {
-            sector[iSector].filler=lValue;
+            sector[iSector].fogpal=lValue;
             return;
         }
-        Gv_SetVarX(lVar2, sector[iSector].filler);
+        Gv_SetVarX(lVar2, sector[iSector].fogpal);
         return;
 
     case SECTOR_LOTAG:
@@ -3581,7 +3581,7 @@ static int32_t __fastcall VM_AccessSectorX(int32_t iSector, int32_t lLabelID)
     case SECTOR_FLOORXPANNING: return sector[iSector].floorxpanning;
     case SECTOR_FLOORYPANNING: return sector[iSector].floorypanning;
     case SECTOR_VISIBILITY: return sector[iSector].visibility;
-    case SECTOR_ALIGNTO: return sector[iSector].filler;
+    case SECTOR_FOGPAL: return sector[iSector].fogpal;
     case SECTOR_LOTAG: return (int16_t)sector[iSector].lotag;
     case SECTOR_HITAG: return (int16_t)sector[iSector].hitag;
     case SECTOR_ULOTAG: return sector[iSector].lotag;
diff --git a/polymer/eduke32/source/lunatic/con_lang.lua b/polymer/eduke32/source/lunatic/con_lang.lua
index 79d9bd141..9c7a6b8ca 100644
--- a/polymer/eduke32/source/lunatic/con_lang.lua
+++ b/polymer/eduke32/source/lunatic/con_lang.lua
@@ -710,8 +710,8 @@ local SectorLabels = {
     floorypanning = SEC".floorypanning",
 
     visibility = SEC".visibility",
-    filler = SEC".filler",
-    alignto = SEC".filler",  -- NAME
+    fogpal = SEC".fogpal",
+    alignto = SEC".fogpal",  -- NAME
 
     lotag = SEC".lotag",
     hitag = SEC".hitag",
diff --git a/polymer/eduke32/source/lunatic/defs_common.lua b/polymer/eduke32/source/lunatic/defs_common.lua
index 78890165a..c02dbe2dc 100644
--- a/polymer/eduke32/source/lunatic/defs_common.lua
+++ b/polymer/eduke32/source/lunatic/defs_common.lua
@@ -205,7 +205,7 @@ string.format([[
     };
 ]], CF_MEMBERS:gsub("~","ceiling"), CF_MEMBERS:gsub("~","floor"))
 ..[[
-    uint8_t visibility, filler;
+    uint8_t visibility, fogpal;
     int16_t lotag, hitag;  // NOTE: signed for Lunatic
     int16_t extra;
 }]]
diff --git a/polymer/eduke32/source/lunatic/engine_maptext.lua b/polymer/eduke32/source/lunatic/engine_maptext.lua
index fa6dce2c2..b7c9142fc 100644
--- a/polymer/eduke32/source/lunatic/engine_maptext.lua
+++ b/polymer/eduke32/source/lunatic/engine_maptext.lua
@@ -43,7 +43,7 @@ local sector_members = {
     Y = "ceilingypanning", y = "floorypanning",
 
     v = "visibility",
-    _ = "filler",
+    _ = "fogpal",
     o = "lotag", i = "hitag", e = { "extra", -1 }
 }
 
diff --git a/polymer/eduke32/source/lunatic/util/build.lua b/polymer/eduke32/source/lunatic/util/build.lua
index aaf3cd835..1fe60b084 100644
--- a/polymer/eduke32/source/lunatic/util/build.lua
+++ b/polymer/eduke32/source/lunatic/util/build.lua
@@ -29,7 +29,7 @@ local STRUCTDEF = {
     int16_t floorpicnum, floorheinum;
     int8_t floorshade;
     uint8_t floorpal, floorxpanning, floorypanning;
-    uint8_t visibility, filler;
+    uint8_t visibility, fogpal;
     int16_t lotag, hitag, extra;
 ]],
 
diff --git a/polymer/eduke32/source/lunatic/util/map2text.lua b/polymer/eduke32/source/lunatic/util/map2text.lua
index 2fba2b132..67e90f4e4 100755
--- a/polymer/eduke32/source/lunatic/util/map2text.lua
+++ b/polymer/eduke32/source/lunatic/util/map2text.lua
@@ -58,7 +58,7 @@ local sector_members = {
     "floorpicnum", "floorheinum",
     "floorshade",
     "floorpal", "floorxpanning", "floorypanning",
-    "visibility", "filler",
+    "visibility", "fogpal",
     "lotag", "hitag", "extra",
 }
 
diff --git a/polymer/eduke32/source/m32def.c b/polymer/eduke32/source/m32def.c
index 5268469ba..a197309a4 100644
--- a/polymer/eduke32/source/m32def.c
+++ b/polymer/eduke32/source/m32def.c
@@ -441,12 +441,12 @@ const memberlabel_t SectorLabels[]=
     { "floorxpanning", SECTOR_FLOORXPANNING, 0, 0, 0 },
     { "floorypanning", SECTOR_FLOORYPANNING, 0, 0, 0 },
     { "visibility", SECTOR_VISIBILITY, 0, 0, 0 },
-    { "alignto", SECTOR_ALIGNTO, 0, 0, 0 }, // aka filler, not used
+    { "fogpal", SECTOR_FOGPAL, 0, 0, 0 }, // formerly filler
     { "lotag", SECTOR_LOTAG, 0, 0, 0 },
     { "hitag", SECTOR_HITAG, 0, 0, 0 },
     { "extra", SECTOR_EXTRA, 0, 0, 0 },
 // aliases
-    { "filler", SECTOR_ALIGNTO, 0, 0, 0 },
+    { "alignto", SECTOR_FOGPAL, 0, 0, 0 }, // formerly filler
     { "ceilingheinum", SECTOR_CEILINGSLOPE, 0, 0, 0},
     { "floorheinum", SECTOR_FLOORSLOPE, 0, 0, 0},
 
diff --git a/polymer/eduke32/source/m32def.h b/polymer/eduke32/source/m32def.h
index a68ab4d3b..bafad822d 100644
--- a/polymer/eduke32/source/m32def.h
+++ b/polymer/eduke32/source/m32def.h
@@ -186,7 +186,7 @@ enum SectorLabel_t
     SECTOR_FLOORXPANNING,
     SECTOR_FLOORYPANNING,
     SECTOR_VISIBILITY,
-    SECTOR_ALIGNTO,
+    SECTOR_FOGPAL,
     SECTOR_LOTAG,
     SECTOR_HITAG,
     SECTOR_EXTRA,
diff --git a/polymer/eduke32/source/m32structures.c b/polymer/eduke32/source/m32structures.c
index cea1a916b..c3da422db 100644
--- a/polymer/eduke32/source/m32structures.c
+++ b/polymer/eduke32/source/m32structures.c
@@ -220,7 +220,7 @@ static int32_t __fastcall VM_AccessSector(int32_t how, int32_t lVar1, int32_t lL
         case SECTOR_FLOORXPANNING: sector[i].floorxpanning=lValue; break;
         case SECTOR_FLOORYPANNING: sector[i].floorypanning=lValue; break;
         case SECTOR_VISIBILITY: sector[i].visibility=lValue; break;
-        case SECTOR_ALIGNTO: sector[i].filler=lValue; break;
+        case SECTOR_FOGPAL: sector[i].fogpal=lValue; break;
         case SECTOR_LOTAG: sector[i].lotag=lValue; break;
         case SECTOR_HITAG: sector[i].hitag=lValue; break;
         case SECTOR_EXTRA: sector[i].extra=lValue; break;
@@ -253,7 +253,7 @@ static int32_t __fastcall VM_AccessSector(int32_t how, int32_t lVar1, int32_t lL
         case SECTOR_FLOORXPANNING: lValue=sector[i].floorxpanning; break;
         case SECTOR_FLOORYPANNING: lValue=sector[i].floorypanning; break;
         case SECTOR_VISIBILITY: lValue=sector[i].visibility; break;
-        case SECTOR_ALIGNTO: lValue=sector[i].filler; break;
+        case SECTOR_FOGPAL: lValue=sector[i].fogpal; break;
         case SECTOR_LOTAG: lValue=sector[i].lotag; break;
         case SECTOR_HITAG: lValue=sector[i].hitag; break;
         case SECTOR_EXTRA: lValue=sector[i].extra; break;