diff --git a/polymer/build/include/build.h b/polymer/build/include/build.h
index 783aa2e31..a01488187 100644
--- a/polymer/build/include/build.h
+++ b/polymer/build/include/build.h
@@ -186,6 +186,7 @@ EXTERN int guniqhudid;
 EXTERN sectortype *sector;
 EXTERN walltype *wall;
 EXTERN spritetype *sprite;
+EXTERN spritetype *tspriteptr[MAXSPRITESONSCREEN];
 
 EXTERN int spritesortcnt;
 EXTERN spritetype *tsprite;
diff --git a/polymer/build/include/polymer.h b/polymer/build/include/polymer.h
index 133f80d00..6a6d566c6 100644
--- a/polymer/build/include/polymer.h
+++ b/polymer/build/include/polymer.h
@@ -7,6 +7,7 @@
 //   o make occlusion queries every n frames (cvar)
 //   o there's still a texture alignment problem with slopes (waterfall in launch facility)
 //   o there's also the texture alignment problem Hunter reported (san andreas fault)
+//   o also sliding doors are still fucked up sometimes (like under the bar in E1L2)
 //   o port glowmaps and detail maps from hacked polymost (:(
 //   o shading needs a lot of work
 //   o make the portal smaller
diff --git a/polymer/build/src/engine.c b/polymer/build/src/engine.c
index 2f838e722..33513edbe 100644
--- a/polymer/build/src/engine.c
+++ b/polymer/build/src/engine.c
@@ -571,7 +571,7 @@ static short maskwall[MAXWALLSB], maskwallcnt;
 static int spritesx[MAXSPRITESONSCREEN];
 static int spritesy[MAXSPRITESONSCREEN+1];
 static int spritesz[MAXSPRITESONSCREEN];
-static spritetype *tspriteptr[MAXSPRITESONSCREEN];
+spritetype *tspriteptr[MAXSPRITESONSCREEN];
 
 short umost[MAXXDIM], dmost[MAXXDIM];
 static short bakumost[MAXXDIM], bakdmost[MAXXDIM];
@@ -3184,6 +3184,21 @@ static void drawsprite(int snum)
 # endif
         return;
     }
+# ifdef USE_OPENGL
+    if (rendmode == 4)
+    {
+        bglEnable(GL_ALPHA_TEST);
+        bglEnable(GL_BLEND);
+        bglEnable(GL_POLYGON_OFFSET_FILL);
+
+        polymer_drawsprite(snum);
+
+        bglDisable(GL_POLYGON_OFFSET_FILL);
+        bglDisable(GL_BLEND);
+        bglDisable(GL_ALPHA_TEST);
+        return;
+    }
+# endif
 #endif
     //============================================================================= //POLYMOST ENDS
 
@@ -6096,7 +6111,7 @@ void drawmasks(void)
     _point2d dot, dot2, middle, pos, spr;
 
 #ifdef USE_OPENGL
-    if (rendmode == 4)
+    if ((rendmode == 4) && 0)
     {
         polymer_drawmasks();
         return;
diff --git a/polymer/build/src/polymer.c b/polymer/build/src/polymer.c
index d2c15249f..022f03ac5 100644
--- a/polymer/build/src/polymer.c
+++ b/polymer/build/src/polymer.c
@@ -437,7 +437,7 @@ void                polymer_drawsprite(int snum)
 
     if (pr_verbosity >= 3) OSD_Printf("PR : Sprite %i...\n", snum);
 
-    tspr = &tsprite[snum];
+    tspr = tspriteptr[snum];
 
     curpicnum = tspr->picnum;
     if (picanm[curpicnum]&192) curpicnum += animateoffs(curpicnum,tspr->owner+32768);