I've been running into memory problems with the tar surface - an
isosurface with a max-gradient of between 100-200. So I rather made a
height-field using a black to white gradient for depth. I had to use
normals for the stony texture because I would have had to use an image
30000 pixels high to get the stone bumps showing in a heightfield.

I think the bricks are fine now. I still need to add doors, windows and
fire-escape steps, etc.

Comments, critique and help welcome.

-Nekar Xenos-

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