diff --git a/src/r_poly_portal.cpp b/src/r_poly_portal.cpp
index 1bb6007795..96df9daf09 100644
--- a/src/r_poly_portal.cpp
+++ b/src/r_poly_portal.cpp
@@ -162,11 +162,14 @@ void PolyDrawLinePortal::Render(int portalDepth)
 		TriMatrix::scale(1.0f, glset.pixelstretch, 1.0f) *
 		TriMatrix::swapYZ() *
 		TriMatrix::translate((float)-ViewPos.X, (float)-ViewPos.Y, (float)-ViewPos.Z);
+	if (Mirror)
+		worldToView = TriMatrix::scale(-1.0f, 1.0f, 1.0f) * worldToView;
 	TriMatrix worldToClip = TriMatrix::perspective(fovy, ratio, 5.0f, 65535.0f) * worldToView;
 
 	// Calculate plane clipping
-	DVector2 planePos = Portal->mDestination->v1->fPos();
-	DVector2 planeNormal = (Portal->mDestination->v2->fPos() - Portal->mDestination->v1->fPos()).Rotated90CW();
+	line_t *clipLine = Portal ? Portal->mDestination : Mirror;
+	DVector2 planePos = clipLine->v1->fPos();
+	DVector2 planeNormal = (clipLine->v2->fPos() - clipLine->v1->fPos()).Rotated90CW();
 	planeNormal.MakeUnit();
 	double planeD = -(planeNormal | (planePos + planeNormal * 0.001));
 	Vec4f portalPlane((float)planeNormal.X, (float)planeNormal.Y, 0.0f, (float)planeD);
@@ -191,7 +194,7 @@ void PolyDrawLinePortal::SaveGlobals()
 	savedangle = ViewAngle;
 	savedcamera = camera;
 	savedsector = viewsector;
-	savedvisibility = camera ? camera->renderflags & RF_INVISIBLE : ActorRenderFlags::FromInt(0);
+	savedinvisibility = camera ? (camera->renderflags & RF_INVISIBLE) == RF_INVISIBLE : false;
 	savedViewPath[0] = ViewPath[0];
 	savedViewPath[1] = ViewPath[1];
 
@@ -229,6 +232,9 @@ void PolyDrawLinePortal::SaveGlobals()
 			ViewPos.Y = (y1 + r * dy) * 2 - y;
 		}
 		ViewAngle = Mirror->Delta().Angle() * 2 - startang;
+
+		if (camera)
+			camera->renderflags &= ~RF_INVISIBLE;
 	}
 	else
 	{
@@ -255,22 +261,25 @@ void PolyDrawLinePortal::SaveGlobals()
 				}
 			}
 		}
-
-		/*if (Portal->mirror)
-		{
-			if (MirrorFlags & RF_XFLIP) MirrorFlags &= ~RF_XFLIP;
-			else MirrorFlags |= RF_XFLIP;
-		}*/
 	}
 
-	camera = nullptr;
+	//camera = nullptr;
 	//viewsector = R_PointInSubsector(ViewPos)->sector;
 	R_SetViewAngle();
+
+	if (Mirror)
+		PolyTriangleDrawer::toggle_mirror();
 }
 
 void PolyDrawLinePortal::RestoreGlobals()
 {
-	if (!savedvisibility && camera) camera->renderflags &= ~RF_INVISIBLE;
+	if (camera)
+	{
+		if (savedinvisibility)
+			camera->renderflags |= RF_INVISIBLE;
+		else
+			camera->renderflags &= ~RF_INVISIBLE;
+	}
 	camera = savedcamera;
 	viewsector = savedsector;
 	ViewPos = savedpos;
@@ -279,4 +288,7 @@ void PolyDrawLinePortal::RestoreGlobals()
 	ViewPath[0] = savedViewPath[0];
 	ViewPath[1] = savedViewPath[1];
 	R_SetViewAngle();
+
+	if (Mirror)
+		PolyTriangleDrawer::toggle_mirror();
 }
diff --git a/src/r_poly_portal.h b/src/r_poly_portal.h
index 7835bb042f..6cad98ff6a 100644
--- a/src/r_poly_portal.h
+++ b/src/r_poly_portal.h
@@ -85,6 +85,6 @@ private:
 	DAngle savedangle;
 	AActor *savedcamera;
 	sector_t *savedsector;
-	ActorRenderFlags savedvisibility;
+	bool savedinvisibility;
 	DVector3 savedViewPath[2];
 };
diff --git a/src/r_poly_scene.cpp b/src/r_poly_scene.cpp
index 7304000a67..ef2ef5f1b4 100644
--- a/src/r_poly_scene.cpp
+++ b/src/r_poly_scene.cpp
@@ -121,9 +121,16 @@ void RenderPolyScene::RenderSubsector(subsector_t *sub)
 void RenderPolyScene::RenderSprite(AActor *thing, double sortDistance, const DVector2 &left, const DVector2 &right)
 {
 	if (numnodes == 0)
-		RenderSprite(thing, sortDistance, left, right, 0.0, 1.0, subsectors);
+	{
+		subsector_t *sub = subsectors;
+		auto it = SubsectorDepths.find(sub);
+		if (it != SubsectorDepths.end())
+			TranslucentObjects.push_back({ thing, sub, it->second, sortDistance, 0.0f, 1.0f });
+	}
 	else
+	{
 		RenderSprite(thing, sortDistance, left, right, 0.0, 1.0, nodes + numnodes - 1); // The head node is the last node output.
+	}
 }
 
 void RenderPolyScene::RenderSprite(AActor *thing, double sortDistance, DVector2 left, DVector2 right, double t1, double t2, void *node)
diff --git a/src/r_poly_triangle.cpp b/src/r_poly_triangle.cpp
index 4b6e1c344a..45f244aabd 100644
--- a/src/r_poly_triangle.cpp
+++ b/src/r_poly_triangle.cpp
@@ -45,6 +45,7 @@ int PolyTriangleDrawer::dest_width;
 int PolyTriangleDrawer::dest_height;
 uint8_t *PolyTriangleDrawer::dest;
 bool PolyTriangleDrawer::dest_bgra;
+bool PolyTriangleDrawer::mirror;
 
 void PolyTriangleDrawer::set_viewport(int x, int y, int width, int height, DCanvas *canvas)
 {
@@ -66,11 +67,18 @@ void PolyTriangleDrawer::set_viewport(int x, int y, int width, int height, DCanv
 	dest += (offsetx + offsety * dest_pitch) * pixelsize;
 	dest_width = clamp(viewport_x + viewport_width, 0, dest_width - offsetx);
 	dest_height = clamp(viewport_y + viewport_height, 0, dest_height - offsety);
+
+	mirror = false;
+}
+
+void PolyTriangleDrawer::toggle_mirror()
+{
+	mirror = !mirror;
 }
 
 void PolyTriangleDrawer::draw(const PolyDrawArgs &args, TriDrawVariant variant, TriBlendMode blendmode)
 {
-	DrawerCommandQueue::QueueCommand<DrawPolyTrianglesCommand>(args, variant, blendmode);
+	DrawerCommandQueue::QueueCommand<DrawPolyTrianglesCommand>(args, variant, blendmode, mirror);
 }
 
 void PolyTriangleDrawer::draw_arrays(const PolyDrawArgs &drawargs, TriDrawVariant variant, TriBlendMode blendmode, WorkerThreadData *thread)
@@ -328,9 +336,11 @@ void PolyTriangleDrawer::clipedge(const ShadedTriVertex *verts, TriVertex *clipp
 
 /////////////////////////////////////////////////////////////////////////////
 
-DrawPolyTrianglesCommand::DrawPolyTrianglesCommand(const PolyDrawArgs &args, TriDrawVariant variant, TriBlendMode blendmode)
+DrawPolyTrianglesCommand::DrawPolyTrianglesCommand(const PolyDrawArgs &args, TriDrawVariant variant, TriBlendMode blendmode, bool mirror)
 	: args(args), variant(variant), blendmode(blendmode)
 {
+	if (mirror)
+		this->args.ccw = !this->args.ccw;
 }
 
 void DrawPolyTrianglesCommand::Execute(DrawerThread *thread)
diff --git a/src/r_poly_triangle.h b/src/r_poly_triangle.h
index 46948310fe..ecf05a9217 100644
--- a/src/r_poly_triangle.h
+++ b/src/r_poly_triangle.h
@@ -158,6 +158,7 @@ class PolyTriangleDrawer
 public:
 	static void set_viewport(int x, int y, int width, int height, DCanvas *canvas);
 	static void draw(const PolyDrawArgs &args, TriDrawVariant variant, TriBlendMode blendmode);
+	static void toggle_mirror();
 
 private:
 	static ShadedTriVertex shade_vertex(const TriMatrix &objectToClip, const float *clipPlane, const TriVertex &v);
@@ -169,6 +170,7 @@ private:
 	static int viewport_x, viewport_y, viewport_width, viewport_height, dest_pitch, dest_width, dest_height;
 	static bool dest_bgra;
 	static uint8_t *dest;
+	static bool mirror;
 
 	enum { max_additional_vertices = 16 };
 
@@ -245,7 +247,7 @@ private:
 class DrawPolyTrianglesCommand : public DrawerCommand
 {
 public:
-	DrawPolyTrianglesCommand(const PolyDrawArgs &args, TriDrawVariant variant, TriBlendMode blendmode);
+	DrawPolyTrianglesCommand(const PolyDrawArgs &args, TriDrawVariant variant, TriBlendMode blendmode, bool mirror);
 
 	void Execute(DrawerThread *thread) override;
 	FString DebugInfo() override;