Tuesday, November 27, 2012

Spotted: Soft shadows with gpu ray tracing - Axis-aligned filtering for interactive sampled soft shadows

Axis-aligned filtering for interactive sampled soft shadows

Soham Uday Mehta, Brandon Wang, Ravi Ramamoorthi

We develop a simple and efficient method for soft shadows from planar area light sources, based on explicit occlusion calculation by raytracing, followed by adaptive image-space filtering. Since the method is based on Monte Carlo sampling, it is accurate. Since the filtering is in image-space, it adds minimal overhead and can be performed at real-time frame rates. We obtain interactive speeds, using the Optix GPU raytracing framework. Our technical approach derives from recent work on frequency analysis and sheared pixel-light filtering for offline soft shadows. While sample counts can be reduced dramatically, the sheared filtering step is slow, adding minutes of overhead.

No comments:

Post a Comment