diff --git a/src/p_mobj.c b/src/p_mobj.c
index 6b2d1af30..55d10b3bf 100644
--- a/src/p_mobj.c
+++ b/src/p_mobj.c
@@ -9718,9 +9718,9 @@ void P_SpawnMapThing(mapthing_t *mthing)
 	{
 	case MT_SKYBOX:
 		if (mthing->options & MTF_OBJECTSPECIAL)
-			skyboxmo[1] = mobj;
+			skyboxcenterpnts[mthing->extrainfo] = mobj;
 		else
-			skyboxmo[0] = mobj;
+			skyboxviewpnts[mthing->extrainfo] = mobj;
 		break;
 	case MT_FAN:
 		if (mthing->options & MTF_OBJECTSPECIAL)
diff --git a/src/p_setup.c b/src/p_setup.c
index a0c745e60..981baf2e2 100644
--- a/src/p_setup.c
+++ b/src/p_setup.c
@@ -2728,6 +2728,9 @@ boolean P_SetupLevel(boolean skipprecip)
 	for (i = 0; i < 2; i++)
 		skyboxmo[i] = NULL;
 
+	for (i = 0; i < 16; i++)
+		skyboxviewpnts[i] = skyboxcenterpnts[i] = NULL;
+
 	P_MapStart();
 
 	P_PrepareThings(lastloadedmaplumpnum + ML_THINGS);
@@ -2737,6 +2740,9 @@ boolean P_SetupLevel(boolean skipprecip)
 #endif
 
 	P_LoadThings();
+	// skybox mobj defaults
+	skyboxmo[0] = skyboxviewpnts[0];
+	skyboxmo[1] = skyboxcenterpnts[0];
 
 	P_SpawnSecretItems(loademblems);
 
diff --git a/src/p_spec.c b/src/p_spec.c
index db7b852f5..7be9c96ea 100644
--- a/src/p_spec.c
+++ b/src/p_spec.c
@@ -46,7 +46,9 @@
 #include <errno.h>
 #endif
 
-mobj_t *skyboxmo[2];
+mobj_t *skyboxmo[2]; // current skybox mobjs: 0 = viewpoint, 1 = centerpoint
+mobj_t *skyboxviewpnts[16]; // array of MT_SKYBOX viewpoint mobjs
+mobj_t *skyboxcenterpnts[16]; // array of MT_SKYBOX centerpoint mobjs
 
 // Amount (dx, dy) vector linedef is shifted right to get scroll amount
 #define SCROLL_SHIFT 5
@@ -3159,6 +3161,38 @@ static void P_ProcessLineSpecial(line_t *line, mobj_t *mo, sector_t *callsec)
 			}
 			break;
 
+		case 448: // Change skybox viewpoint/centerpoint
+			if ((mo && mo->player && P_IsLocalPlayer(mo->player)) || (line->flags & ML_NOCLIMB))
+			{
+				INT32 viewid = sides[line->sidenum[0]].textureoffset>>FRACBITS;
+				INT32 centerid = sides[line->sidenum[0]].rowoffset>>FRACBITS;
+
+				// set viewpoint mobj
+				if (!(line->flags & ML_EFFECT4))
+				{
+					if (viewid >= 0 && viewid < 16)
+						skyboxmo[0] = skyboxviewpnts[viewid];
+					else
+						skyboxmo[0] = NULL;
+				}
+
+				// set centerpoint mobj
+				if (line->flags & ML_BLOCKMONSTERS)
+				{
+					if (centerid >= 0 && centerid < 16)
+						skyboxmo[1] = skyboxcenterpnts[centerid];
+					else
+						skyboxmo[1] = NULL;
+				}
+
+				CONS_Debug(DBG_GAMELOGIC, "Line type 448 Executor: viewid = %d, centerid = %d, viewpoint? = %s, centerpoint? = %s\n",
+						viewid,
+						centerid,
+						((line->flags & ML_EFFECT4) ? "no" : "yes"),
+						((line->flags & ML_BLOCKMONSTERS) ? "yes" : "no"));
+			}
+			break;
+
 		case 450: // Execute Linedef Executor - for recursion
 			P_LinedefExecute(line->tag, mo, NULL);
 			break;
diff --git a/src/p_spec.h b/src/p_spec.h
index e34b0d08e..222df822d 100644
--- a/src/p_spec.h
+++ b/src/p_spec.h
@@ -17,7 +17,9 @@
 #ifndef __P_SPEC__
 #define __P_SPEC__
 
-extern mobj_t *skyboxmo[2];
+extern mobj_t *skyboxmo[2]; // current skybox mobjs: 0 = viewpoint, 1 = centerpoint
+extern mobj_t *skyboxviewpnts[16]; // array of MT_SKYBOX viewpoint mobjs
+extern mobj_t *skyboxcenterpnts[16]; // array of MT_SKYBOX centerpoint mobjs
 
 // GETSECSPECIAL (specialval, section)
 //