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Journal Articles Computer Graphics Forum Year : 2008

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

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

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Dates and versions

inria-00345285 , version 1 (08-12-2008)

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Erik Sintorn, Elmar Eisemann, Ulf Assarsson. Sample-based Visibility for Soft Shadows Using Alias-free Shadow Maps. Computer Graphics Forum, 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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