Tuesday, November 27, 2012

Spotted: bsp-like depth sorting without splitting - Depth-presorted triangle lists

Worth a closer look. 

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Depth-presorted triangle lists

Ge Chen, Pedro V. Sander, Diego Nehab, Lei Yang, Liang Hu

We present a novel approach for real-time rendering of static 3D models front-to-back or back-to-front relative to any viewpoint outside its bounding volume. The approach renders depth-sorted triangles using a single draw-call. At run-time, we replace the traditional sorting strategy of existing algorithms with a faster triangle selection strategy. The selection process operates on an extended sequence of triangles annotated by test planes, created by our off-line preprocessing stage. Based on these test planes, a simple run-time procedure uses the given viewpoint to select a subsequence of triangles for rasterization. Selected subsequences are statically presorted by depth and contain each input triangle exactly once.

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