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Ray Reordering Techniques for GPU Ray-Cast Ambient Occlusion
2020
Global illumination techniques, such as ambient occlusion, can be performed in a physically accurate way via ray casting. However ambient occlusion rays are incoherent. This means their computation is divergent causing a degradation of rendering performance. This problem is particularly acute on the GPU stream computing architectures which have performance issues with thread divergence. We reorder the rays, prior to the rendering step, to reduce this thread divergence issue. Rays which traverse
doi:10.2312/pt.20141311
fatcat:plyafks3mjgyhf3gmblrwf2gvy