Sample-based Visibility for Soft Shadows Using Alias-free Shadow Maps

Erik Sintorn 1 Elmar Eisemann 2, * Ulf Assarsson 1
* Corresponding author
2 ARTIS - Acquisition, representation and transformations for image synthesis
Inria Grenoble - Rhône-Alpes, LJK - Laboratoire Jean Kuntzmann, INPG - Institut National Polytechnique de Grenoble
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. More at http://artis.imag.fr/Publications/2008/SEA08
Keywords : GPU Shadows alias-free
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Erik Sintorn, Elmar Eisemann, Ulf Assarsson. Sample-based Visibility for Soft Shadows Using Alias-free Shadow Maps. Computer Graphics Forum, Wiley, 2008, Proceedings of the Eurographics Symposium on Rendering 2008, 27 (4), pp.1285-1292. ⟨10.1111/j.1467-8659.2008.01267.x⟩. ⟨inria-00345285⟩

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