Sample based visibility for soft shadows using alias-free shadow maps

Authors:
Erik Sintorn;Elmar Eisemann;Ulf Assarsson
Affiliations:
Chalmers University of Technology, Sweden;ARTIS-INRIA/Grenoble University, France;Chalmers University of Technology, Sweden
Venue:
EGSR'08 Proceedings of the Nineteenth Eurographics conference on Rendering
Year:
2008

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Abstract

This paper introduces an accurate real-time soft shadow algorithm that uses sample based visibility. Initially, we present a GPU-based alias-free hard shadow map algorithm that typically requires only a single render pass from the light, in contrast to using depth peeling and one pass per layer. For closed objects, we also suppress the need for a bias. The method is extended to soft shadow sampling for an arbitrarily shaped area-/volumetric light source using 128-1024 light samples per screen pixel. The alias-free shadow map guarantees that the visibility is accurately sampled per screen-space pixel, even for arbitrarily shaped (e.g. non-planar) surfaces or solid objects. Another contribution is a smooth coherent shading model to avoid common light leakage near shadow borders due to normal interpolation.