- give the sector a level reference.

src/maploader/maploader.cpp

@@ -1098,6 +1098,7 @@ void MapLoader::LoadSectors (MapData *map, FMissingTextureTracker &missingtex)
 	for (unsigned i = 0; i < numsectors; i++, ss++, ms++)
 	{
 		ss->e = &sectors[0].e[i];
+		ss->Level = Level;
 		if (!map->HasBehavior) ss->Flags |= SECF_FLOORDROP;
 		ss->SetPlaneTexZ(sector_t::floor, (double)LittleShort(ms->floorheight));
 		ss->floorplane.set(0, 0, 1., -ss->GetPlaneTexZ(sector_t::floor));

src/maploader/udmf.cpp

@@ -1445,6 +1445,7 @@ public:
 		FName scroll_floor_type = NAME_None;
 
 		memset(sec, 0, sizeof(*sec));
+		sec->Level = Level;
 		sec->lightlevel = 160;
 		sec->SetXScale(sector_t::floor, 1.);	// [RH] floor and ceiling scaling
 		sec->SetYScale(sector_t::floor, 1.);

src/r_defs.h

@@ -264,7 +264,6 @@ public:
 // Stores things/mobjs.
 //
 class DSectorEffect;
-struct sector_t;
 struct FRemapTable;
 
 enum
@@ -453,7 +452,6 @@ public:
 
 #include "p_3dfloors.h"
 struct subsector_t;
-struct sector_t;
 struct side_t;
 extern bool gl_plane_reflection_i;
 
@@ -652,6 +650,7 @@ struct sector_t
 
 	splane planes[2];
 
+	FLevelLocals *Level;
 	extsector_t	*				e;			// This stores data that requires construction/destruction. Such data must not be copied by R_FakeFlat.
 
 	secplane_t	floorplane, ceilingplane;	// [RH] store floor and ceiling planes instead of heights