diff --git a/src/org/oscim/renderer/GLRenderer.java b/src/org/oscim/renderer/GLRenderer.java
index 06ca59e1..a25ab142 100644
--- a/src/org/oscim/renderer/GLRenderer.java
+++ b/src/org/oscim/renderer/GLRenderer.java
@@ -63,7 +63,7 @@ public class GLRenderer implements GLSurfaceView.Renderer {
 	static int CACHE_TILES = CACHE_TILES_MAX;
 
 	private static MapView mMapView;
-	static int mWidth, mHeight;
+	static int screenWidth, screenHeight;
 
 	private static MapViewPosition mMapViewPosition;
 	private static MapPosition mMapPosition;
@@ -589,8 +589,8 @@ public class GLRenderer implements GLSurfaceView.Renderer {
 		if (width <= 0 || height <= 0)
 			return;
 
-		mWidth = width;
-		mHeight = height;
+		screenWidth = width;
+		screenHeight = height;
 
 		mMapViewPosition.getMatrix(null, mMatrices.proj, null);
 
@@ -648,8 +648,8 @@ public class GLRenderer implements GLSurfaceView.Renderer {
 		mBufferMemoryUsage = 0;
 		mDrawTiles = null;
 
-		int numTiles = (mWidth / (Tile.TILE_SIZE / 2) + 2)
-				* (mHeight / (Tile.TILE_SIZE / 2) + 2);
+		int numTiles = (screenWidth / (Tile.TILE_SIZE / 2) + 2)
+				* (screenHeight / (Tile.TILE_SIZE / 2) + 2);
 
 		// Set up vertex buffer objects
 		int numVBO = (CACHE_TILES + (numTiles * 2));
@@ -682,6 +682,7 @@ public class GLRenderer implements GLSurfaceView.Renderer {
 
 	public static final boolean debugView = false;
 
+
 	void clearBuffer() {
 		mNewSurface = true;
 	}
diff --git a/src/org/oscim/renderer/TextureRenderer.java b/src/org/oscim/renderer/TextureRenderer.java
index 512403b1..986aea64 100644
--- a/src/org/oscim/renderer/TextureRenderer.java
+++ b/src/org/oscim/renderer/TextureRenderer.java
@@ -67,7 +67,7 @@ public final class TextureRenderer {
 		else
 			GLES20.glUniform1f(hTextureScale, 1);
 
-		GLES20.glUniform1f(hTextureScreenScale, 1f / GLRenderer.mWidth);
+		GLES20.glUniform1f(hTextureScreenScale, 1f / GLRenderer.screenWidth);
 
 		m.proj.setAsUniform(hTextureProjMatrix);
 		m.mvp.setAsUniform(hTextureMVMatrix);
diff --git a/src/org/oscim/renderer/layer/ExtrusionLayer.java b/src/org/oscim/renderer/layer/ExtrusionLayer.java
index 9074e08e..9bc173b9 100644
--- a/src/org/oscim/renderer/layer/ExtrusionLayer.java
+++ b/src/org/oscim/renderer/layer/ExtrusionLayer.java
@@ -59,8 +59,6 @@ public class ExtrusionLayer extends Layer {
 
 	public boolean compiled = false;
 
-	//private int[] mVboIds;
-
 	public ExtrusionLayer(int level) {
 		this.type = Layer.EXTRUSION;
 		this.level = level;
@@ -89,12 +87,11 @@ public class ExtrusionLayer extends Layer {
 
 		// just a guessing to make it look ok
 		if (height == 0)
-			height = 10;
-		height = (int) (height * -Math.log(height / 100000f) * 2.0f);
-
-		if (minHeight != 0)
-			minHeight = (int) (minHeight * -Math.log(minHeight / 100000f) * 2.0f);
+			height = 14;
 
+		float sfactor = GLRenderer.COORD_SCALE * (400f / Tile.TILE_SIZE);
+		height *= sfactor;
+		minHeight *= sfactor;
 
 		int length = 0;
 		for (int ipos = 0, ppos = 0, n = way.geom.index.length; ipos < n; ipos++, ppos += length) {
diff --git a/src/org/oscim/renderer/overlays/ExtrusionOverlay.java b/src/org/oscim/renderer/overlays/ExtrusionOverlay.java
index 2bb89334..0a9834a2 100644
--- a/src/org/oscim/renderer/overlays/ExtrusionOverlay.java
+++ b/src/org/oscim/renderer/overlays/ExtrusionOverlay.java
@@ -332,7 +332,7 @@ public class ExtrusionOverlay extends RenderOverlay {
 				scale / GLRenderer.COORD_SCALE);
 
 		// scale height
-		m.mvp.setValue(10, scale / (1000f * GLRenderer.COORD_SCALE));
+		m.mvp.setValue(10, scale / GLRenderer.COORD_SCALE);
 
 		m.mvp.multiplyMM(m.viewproj, m.mvp);
 
diff --git a/src/org/oscim/view/MapViewPosition.java b/src/org/oscim/view/MapViewPosition.java
index cfaa549f..a9b3602b 100644
--- a/src/org/oscim/view/MapViewPosition.java
+++ b/src/org/oscim/view/MapViewPosition.java
@@ -416,7 +416,7 @@ public class MapViewPosition {
 		mRotMatrix.multiplyMM(mTmpMatrix, mRotMatrix);
 
 		// scale to window coordinates
-		mTmpMatrix.setScale(1 / mWidth, 1 / mWidth, 1);
+		mTmpMatrix.setScale(1 / mWidth, 1 / mWidth, 1 / mWidth);
 
 		mViewMatrix.multiplyMM(mRotMatrix, mTmpMatrix);