diff --git a/source/common/rendering/hwrenderer/data/hw_skydome.cpp b/source/common/rendering/hwrenderer/data/hw_skydome.cpp
index af346b364..c4a831f5a 100644
--- a/source/common/rendering/hwrenderer/data/hw_skydome.cpp
+++ b/source/common/rendering/hwrenderer/data/hw_skydome.cpp
@@ -388,7 +388,7 @@ void FSkyVertexBuffer::RenderRow(FRenderState& state, EDrawType prim, int row, b
 
 void FSkyVertexBuffer::RenderDome(FRenderState& state, FGameTexture* tex, int mode)
 {
-	if (tex)
+	if (tex && tex->isValid())
 	{
 		state.SetMaterial(tex, UF_Texture, 0, CLAMP_NONE, 0, -1);
 		state.EnableModelMatrix(true);
diff --git a/source/core/rendering/scene/hw_portal.cpp b/source/core/rendering/scene/hw_portal.cpp
index a7608b301..93537581c 100644
--- a/source/core/rendering/scene/hw_portal.cpp
+++ b/source/core/rendering/scene/hw_portal.cpp
@@ -640,7 +640,58 @@ bool HWLineToLinePortal::Setup(HWDrawInfo *di, FRenderState &rstate, Clipper *cl
 	vp.Pos.X = npos.X;
 	vp.Pos.Y = npos.Y;
 
-	vp.Pos.Z -= (sector[line->sector].floorz - sector[origin->sector].floorz) / 256.f; // for testing only. Blood does not do it.
+	di->SetClipLine(line);
+	di->SetupView(rstate, vp.Pos.X, vp.Pos.Y, vp.Pos.Z, !!(state->MirrorFlag & 1), !!(state->PlaneMirrorFlag & 1));
+	clipper->Clear();
+
+	angle_t af = di->FrustumAngle();
+	if (af < ANGLE_180) clipper->SafeAddClipRange(bamang(vp.RotAngle + af), bamang(vp.RotAngle - af));
+
+	auto startan = gethiq16angle(origin->x - origx, origin->y - origy);
+	auto endan = gethiq16angle(wall[origin->point2].x - origx, wall[origin->point2].y - origy);
+	clipper->SafeAddClipRange(q16ang(endan), q16ang(startan));
+	return true;
+}
+
+const char *HWLineToLinePortal::GetName() { return "LineToLine"; }
+
+
+//-----------------------------------------------------------------------------
+//-----------------------------------------------------------------------------
+//
+//
+// Line to sprite Portal
+//
+//
+//-----------------------------------------------------------------------------
+//-----------------------------------------------------------------------------
+
+//-----------------------------------------------------------------------------
+//
+// only used by SW.
+//
+//-----------------------------------------------------------------------------
+bool HWLineToSpritePortal::Setup(HWDrawInfo* di, FRenderState& rstate, Clipper* clipper)
+{
+	// TODO: Handle recursion more intelligently
+	auto& state = mState;
+	if (state->renderdepth > r_mirror_recursions)
+	{
+		return false;
+	}
+	auto& vp = di->Viewpoint;
+	di->mClipPortal = this;
+
+	auto srccenter = (WallStart(origin) + WallEnd(origin)) / 2;
+	DVector2 destcenter ={ camera->x / 16.f, camera->y / -16.f };
+	DVector2 npos = vp.Pos - srccenter + destcenter;
+
+	int origx = vp.Pos.X * 16;
+	int origy = vp.Pos.Y * -16;
+
+	vp.SectNum = camera->sectnum;
+	vp.Pos.X = npos.X;
+	vp.Pos.Y = npos.Y;
 
 	di->SetClipLine(line);
 	di->SetupView(rstate, vp.Pos.X, vp.Pos.Y, vp.Pos.Z, !!(state->MirrorFlag & 1), !!(state->PlaneMirrorFlag & 1));
@@ -649,13 +700,13 @@ bool HWLineToLinePortal::Setup(HWDrawInfo *di, FRenderState &rstate, Clipper *cl
 	angle_t af = di->FrustumAngle();
 	if (af < ANGLE_180) clipper->SafeAddClipRange(bamang(vp.RotAngle + af), bamang(vp.RotAngle - af));
 
-	auto startan = gethiq16angle(line->x - origx, line->y - origy);
-	auto endan = gethiq16angle(wall[line->point2].x - origx, wall[line->point2].y - origy);
-	clipper->SafeAddClipRange(q16ang(startan), q16ang(endan));  // we check the line from the backside so angles are reversed.
+	auto startan = gethiq16angle(origin->x - origx, origin->y - origy);
+	auto endan = gethiq16angle(wall[origin->point2].x - origx, wall[origin->point2].y - origy);
+	clipper->SafeAddClipRange(q16ang(endan), q16ang(startan));
 	return true;
 }
 
-const char *HWLineToLinePortal::GetName() { return "LineToLine"; }
+const char* HWLineToSpritePortal::GetName() { return "LineToSprite"; }
 
 
 #if 0 // currently none of the games has any support for this. Maybe later.
diff --git a/source/core/rendering/scene/hw_portal.h b/source/core/rendering/scene/hw_portal.h
index 6e163c94d..6b41fdeb3 100644
--- a/source/core/rendering/scene/hw_portal.h
+++ b/source/core/rendering/scene/hw_portal.h
@@ -287,7 +287,7 @@ struct HWLineToLinePortal : public HWLinePortal
 	walltype* origin;
 protected:
 	bool Setup(HWDrawInfo *di, FRenderState &rstate, Clipper *clipper) override;
-	virtual void * GetSource() const override { return line; }
+	virtual void * GetSource() const override { return origin; }
 	virtual const char *GetName() override;
 	virtual walltype *ClipLine() override { return line; }
 
@@ -299,6 +299,26 @@ public:
 	}
 };
 
+struct HWLineToSpritePortal : public HWLinePortal
+{
+	walltype* origin;
+	spritetype* camera;
+protected:
+	bool Setup(HWDrawInfo* di, FRenderState& rstate, Clipper* clipper) override;
+	virtual void* GetSource() const override { return origin; }
+	virtual const char* GetName() override;
+	virtual walltype* ClipLine() override { return line; }
+
+public:
+
+	HWLineToSpritePortal(FPortalSceneState* state, walltype* from, spritetype* to)
+		: HWLinePortal(state, &wall[numwalls]), origin(from), camera(to)
+	{
+		// todo: set up two fake walls at the end of the walls array to be used for backside clipping.
+		// Not really needed for vanilla support but maybe later for feature enhancement.
+	}
+};
+
 
 #if 0
 struct HWSkyboxPortal : public HWScenePortalBase
diff --git a/source/core/rendering/scene/hw_walls.cpp b/source/core/rendering/scene/hw_walls.cpp
index d9bf8faf9..b54846262 100644
--- a/source/core/rendering/scene/hw_walls.cpp
+++ b/source/core/rendering/scene/hw_walls.cpp
@@ -516,6 +516,13 @@ void HWWall::PutPortal(HWDrawInfo *di, int ptype, int plane)
 		portal->AddLine(this);
 		break;
 
+	case PORTALTYPE_LINETOSPRITE:
+		// These are also unique.
+		portal = new HWLineToSpritePortal(&portalState, seg, &sprite[seg->portalnum]);
+		di->Portals.Push(portal);
+		portal->AddLine(this);
+		break;
+
 	case PORTALTYPE_SKY:
 		sky = portalState.UniqueSkies.Get(sky);
 		portal = di->FindPortal(sky);