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Soft Shadow Volumes for Ray Tracing

Samuli Laine 1 Timo Aila 1 Ulf Assarsson 2, 3 Jaakko Lehtinen 1 Tomas Akenine-Möller 4 
3 ARTIS - Acquisition, representation and transformations for image synthesis
GRAVIR - IMAG - Laboratoire d'informatique GRAphique, VIsion et Robotique de Grenoble, Inria Grenoble - Rhône-Alpes, CNRS - Centre National de la Recherche Scientifique : FR71
Abstract : We present a new, fast algorithm for rendering physically-based soft shadows in ray tracing-based renderers. Our method replaces the hundreds of shadow rays commonly used in stochastic ray tracers with a single shadow ray and a local reconstruction of the visibility function. Compared to tracing the shadow rays, our algorithm produces exactly the same image while executing one to two orders of magnitude faster in the test scenes used. Our first contribution is a two-stage method for quickly determining the silhouette edges that overlap an area light source, as seen from the point to be shaded. Secondly, we show that these partial silhouettes of occluders, along with a single shadow ray, are sufficient for reconstructing the visibility function between the point and the light source.
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  • HAL Id : inria-00510157, version 1



Samuli Laine, Timo Aila, Ulf Assarsson, Jaakko Lehtinen, Tomas Akenine-Möller. Soft Shadow Volumes for Ray Tracing. ACM Transactions on Graphics, Association for Computing Machinery, 2005, 24 (3). ⟨inria-00510157⟩



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