This doesn't need to be done with actual ray triangle intersections. There are many techniques relating to relief mapping that deal with ray marching through a

This doesn't need to be done with actual ray triangle intersections. There are many techniques relating to relief mapping that deal with ray marching through a depth map. Here is a pdf: http://developer.download.nvidia.com/books/gpu_gems_3/samples/gems3_ch18.pdf http://developer.download.nvidia.com/books/gpu_gems_3/sample... This technique would actually make it run very fast on a GPU, likely with better quality as well.