diff --git a/source/common/rendering/hwrenderer/data/hw_skydome.cpp b/source/common/rendering/hwrenderer/data/hw_skydome.cpp
index c4a831f5a..340957a3e 100644
--- a/source/common/rendering/hwrenderer/data/hw_skydome.cpp
+++ b/source/common/rendering/hwrenderer/data/hw_skydome.cpp
@@ -62,6 +62,7 @@
 #include "hw_renderstate.h"
 #include "v_video.h"
 #include "hwrenderer/data/buffers.h"
+#include "version.h"
 
 //-----------------------------------------------------------------------------
 //
@@ -139,10 +140,10 @@ FSkyVertexBuffer::~FSkyVertexBuffer()
 
 //-----------------------------------------------------------------------------
 //
-//
+// todo: make both available at the same time.
 //
 //-----------------------------------------------------------------------------
-
+#ifndef BUILD_SKY
 void FSkyVertexBuffer::SkyVertex(int r, int c, bool zflip)
 {
 	static const FAngle maxSideAngle = 60.f;
@@ -179,8 +180,33 @@ void FSkyVertexBuffer::SkyVertex(int r, int c, bool zflip)
 
 	mVertices.Push(vert);
 }
+#else
+void FSkyVertexBuffer::SkyVertex(int r, int c, bool zflip)
+{
+	static const FAngle maxSideAngle = 60.f;
+	static const float scale = 10000.;
 
+	FAngle topAngle = (c / (float)mColumns * 360.f);
+	FVector2 pos = topAngle.ToVector(scale);
+	float z = (!zflip) ? (mRows - r) * 4000.f : -(mRows - r) * 4000.f;
 
+	FSkyVertex vert;
+
+	vert.color = r == 0 ? 0xffffff : 0xffffffff;
+
+	// And the texture coordinates.
+	if (zflip) r = mRows * 2 - r;
+	vert.u = 0.5 + (-c / (float)mColumns);
+	vert.v = (r / (float)(2*mRows));
+
+	// And finally the vertex.
+	vert.x = pos.X;
+	vert.y = z - 1.f;
+	vert.z = pos.Y;
+
+	mVertices.Push(vert);
+}
+#endif
 //-----------------------------------------------------------------------------
 //
 //
diff --git a/source/core/rendering/scene/hw_sky.cpp b/source/core/rendering/scene/hw_sky.cpp
index 30cc3f3b3..913338a2c 100644
--- a/source/core/rendering/scene/hw_sky.cpp
+++ b/source/core/rendering/scene/hw_sky.cpp
@@ -53,16 +53,21 @@ void initSkyInfo(HWDrawInfo *di, HWSkyInfo* sky, sectortype* sector, int plane,
 		int remap = TRANSLATION(Translation_Remap + curbasepal, palette);
 
 		int16_t const* dapskyoff = getpsky(picnum, &dapyscale, &dapskybits, &dapyoffs, &daptileyscale);
+		int tw = tileWidth(picnum);
+		if ((1 << sizeToBits(tw)) < tw) dapskybits--; // Build math is weird.
+
 		skytex = GetSkyTexture(picnum, dapskybits, dapskyoff, remap);
 		realskybits = dapskybits;
 		if (skytex) dapskybits = 0;
 		else skytex = tileGetTexture(picnum);
 	}
 
+	float xpanning = plane == plane_ceiling ? sector->ceilingxpan_ : sector->floorxpan_;
+
 	// dapyscale is not relvant for a sky dome.
 	sky->y_scale = FixedToFloat(daptileyscale);
-	sky->y_offset = dapyoffs*2;
-	sky->x_offset = 0;// xpanning / (1 << (realskybits - dapskybits));
+	sky->y_offset = dapyoffs*1.5;
+	sky->x_offset = xpanning / (1 << (realskybits - dapskybits));
 	sky->fadecolor = FadeColor;
 	sky->shade = 0;// clamp(plane == plane_ceiling ? sector->ceilingshade : sector->floorshade, 0, numshades - 1);
 	sky->texture = skytex;
diff --git a/source/core/rendering/scene/hw_skyportal.cpp b/source/core/rendering/scene/hw_skyportal.cpp
index b7bb106a6..4c12754e5 100644
--- a/source/core/rendering/scene/hw_skyportal.cpp
+++ b/source/core/rendering/scene/hw_skyportal.cpp
@@ -65,22 +65,24 @@ void HWSkyPortal::DrawContents(HWDrawInfo *di, FRenderState &state)
 		float texh = tex->GetDisplayHeight();
 		auto& modelMatrix = state.mModelMatrix;
 		auto& textureMatrix = state.mTextureMatrix;
-		auto texskyoffset = tex->GetSkyOffset() + origin->y_offset + skyoffsettest;
+		auto texskyoffset = tex->GetSkyOffset() + skyoffsettest;
+		if (!(g_gameType & GAMEFLAG_PSEXHUMED)) texskyoffset += origin->y_offset;
 
-		int repeat_fac = 1;
-		if (texh <= 192)
+		float repeat_fac = 1;
+		if (texh <= 256)
 		{
-			repeat_fac = 384 / texh;
-			texh *= repeat_fac;
+			repeat_fac = 336.f / texh;
+			texh = 336;
 		}
 		modelMatrix.loadIdentity();
 		modelMatrix.rotate(-180.0f + origin->x_offset, 0.f, 1.f, 0.f);
-		modelMatrix.translate(0.f, -40 + texskyoffset + (texh - 300) / 2 * skyoffsetfactor, 0.f);
-		//modelMatrix.scale(1.f, 0.8f * 1.17f, 1.f);
+		modelMatrix.translate(0.f, -40 + texskyoffset * skyoffsetfactor, 0.f);
+		modelMatrix.scale(1.f, texh / 400.f, 1.f);
 		textureMatrix.loadIdentity();
-		textureMatrix.scale(-1.f, 0.5*repeat_fac, 1.f);
-		textureMatrix.translate(1.f, 0/*origin->y_offset / texh*/, 1.f);
+		state.EnableTextureMatrix(true);
+		textureMatrix.scale(1.f, repeat_fac, 1.f);
 		vertexBuffer->RenderDome(state, origin->texture, FSkyVertexBuffer::SKYMODE_MAINLAYER);
+		state.EnableTextureMatrix(false);
 	}
 	state.SetTextureMode(TM_NORMAL);
 	if (origin->fadecolor & 0xffffff)
diff --git a/source/core/version.h b/source/core/version.h
index c8a5949a0..e11683536 100644
--- a/source/core/version.h
+++ b/source/core/version.h
@@ -92,5 +92,6 @@ const int SAVEPICHEIGHT = 180;
 const int VID_MIN_WIDTH = 640;
 const int VID_MIN_HEIGHT = 400;
 #define NPOT_EMULATION
+#define BUILD_SKY
 
 #endif //__VERSION_H__
diff --git a/source/games/duke/src/game.cpp b/source/games/duke/src/game.cpp
index 8b284df75..181997346 100644
--- a/source/games/duke/src/game.cpp
+++ b/source/games/duke/src/game.cpp
@@ -313,10 +313,10 @@ void GameInterface::app_init()
 	if (engineInit())
 		G_FatalEngineError();
 
-	setupbackdrop();
 	//Net_SendClientInfo();
 
 	initTiles();
+	setupbackdrop();
 	genspriteremaps();
 	SetupGameButtons();
 	InitCheats();