diff --git a/src/swrenderer/scene/r_3dfloors.h b/src/swrenderer/scene/r_3dfloors.h
index 13168a80b..d697755b2 100644
--- a/src/swrenderer/scene/r_3dfloors.h
+++ b/src/swrenderer/scene/r_3dfloors.h
@@ -78,6 +78,7 @@ namespace swrenderer
 		void EnterSkybox();
 		void LeaveSkybox();
 		void SetFakeFloor(F3DFloor *fakeFloor);
+		void ClearFakeFloors() { FakeFloors.clear(); }
 
 		RenderThread *Thread = nullptr;
 
diff --git a/src/swrenderer/scene/r_opaque_pass.h b/src/swrenderer/scene/r_opaque_pass.h
index 6f0f06581..6a14703c5 100644
--- a/src/swrenderer/scene/r_opaque_pass.h
+++ b/src/swrenderer/scene/r_opaque_pass.h
@@ -60,6 +60,8 @@ namespace swrenderer
 
 		void ResetFakingUnderwater() { r_fakingunderwater = false; }
 		sector_t *FakeFlat(sector_t *sec, sector_t *tempsec, int *floorlightlevel, int *ceilinglightlevel, seg_t *backline, int backx1, int backx2, double frontcz1, double frontcz2);
+		
+		void ClearSeenSprites() { SeenSpriteSectors.clear(); SeenActors.clear(); }
 
 		short floorclip[MAXWIDTH];
 		short ceilingclip[MAXWIDTH];
diff --git a/src/swrenderer/scene/r_portal.cpp b/src/swrenderer/scene/r_portal.cpp
index 9053ebf15..af120103c 100644
--- a/src/swrenderer/scene/r_portal.cpp
+++ b/src/swrenderer/scene/r_portal.cpp
@@ -162,7 +162,8 @@ namespace swrenderer
 			viewsector = port->mDestination;
 			assert(viewsector != nullptr);
 			R_SetViewAngle();
-			validcount++;	// Make sure we see all sprites
+			Thread->OpaquePass->ClearSeenSprites();
+			Thread->Clip3D->ClearFakeFloors();
 
 			planes->ClearKeepFakePlanes();
 			Thread->ClipSegments->Clear(pl->left, pl->right);
@@ -185,6 +186,11 @@ namespace swrenderer
 				}
 			}
 
+			drawseglist->PushPortal();
+			Thread->SpriteList->PushPortal();
+			viewposStack.Push(ViewPos);
+			visplaneStack.Push(pl);
+
 			// Create a drawseg to clip sprites to the sky plane
 			DrawSegment *draw_segment = Thread->FrameMemory->NewObject<DrawSegment>();
 			draw_segment->CurrentPortalUniq = CurrentPortalUniq;
@@ -207,11 +213,6 @@ namespace swrenderer
 			memcpy(draw_segment->sprtopclip, ceilingclip + pl->left, (pl->right - pl->left) * sizeof(short));
 			drawseglist->Push(draw_segment);
 
-			drawseglist->PushPortal();
-			Thread->SpriteList->PushPortal();
-			viewposStack.Push(ViewPos);
-			visplaneStack.Push(pl);
-
 			Thread->OpaquePass->RenderScene();
 			Thread->Clip3D->ResetClip(); // reset clips (floor/ceiling)
 			planes->Render();
@@ -227,7 +228,7 @@ namespace swrenderer
 		{
 			// Masked textures and planes need the view coordinates restored for proper positioning.
 			viewposStack.Pop(ViewPos);
-
+			
 			Thread->TranslucentPass->Render();
 
 			VisiblePlane *pl;
@@ -236,7 +237,7 @@ namespace swrenderer
 			{
 				pl->Render(Thread, pl->Alpha, pl->Additive, true);
 			}
-
+			
 			Thread->SpriteList->PopPortal();
 			drawseglist->PopPortal();
 		}
diff --git a/src/swrenderer/scene/r_scene.cpp b/src/swrenderer/scene/r_scene.cpp
index 905c0a097..f7b8c9c88 100644
--- a/src/swrenderer/scene/r_scene.cpp
+++ b/src/swrenderer/scene/r_scene.cpp
@@ -177,7 +177,7 @@ namespace swrenderer
 		if (!r_scene_multithreaded)
 			numThreads = 1;
 
-		if (numThreads != Threads.size())
+		if (numThreads != (int)Threads.size())
 		{
 			StopThreads();
 			StartThreads(numThreads);