Compressed Facade Displacement Maps

Saif Ali, Jieping Ye, Anshuman Razdan, Peter Wonka
AMD, Santa Clara, CA
IEEE Transactions on Visualization and Computer Graphics, 2008


   title={Compressed facade displacement maps},

   author={Ali, S. and Ye, J. and Razdan, A. and Wonka, P.},

   journal={IEEE Transactions on Visualization and Computer Graphics},



   publisher={Published by the IEEE Computer Society}


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We describe an approach to render massive urban models. To prevent a memory transfer bottleneck we propose to render the models from a compressed representation directly. Our solution is based on rendering crude building outlines as polygons and generating details by ray-tracing displacement maps in the fragment shader. We demonstrate how to compress a displacement map so that a decompression algorithm can selectively and quickly access individual entries in a fragment shader. Our prototype implementation shows how a massive urban model can be compressed by a factor of 85 and outperform a basic geometry-based renderer by a factor of 50 to 80 in rendering speed.
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