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

Erik Sintorn; Elmar Eisemann; Ulf Assarsson

inria-00345285, version 1

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

Erik Sintorn ¹, Elmar Eisemann ( Author to contact preferably ) ^2, 3, Ulf Assarsson ¹

Computer Graphics Forum 27, 4 (2008) 1285-1292

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

1: Chalmers University of Technology (Chalmers)
Chalmers University of Technology
2: Laboratoire Jean Kuntzmann (LJK)
CNRS : UMR5224 – Université Joseph Fourier - Grenoble I – Université Pierre-Mendès-France - Grenoble II – Institut Polytechnique de Grenoble - Grenoble Institute of Technology
3: ARTIS (INRIA Grenoble Rhône-Alpes / LJK Laboratoire Jean Kuntzmann)
CNRS : UMR5224 – INRIA – Laboratoire Jean Kuntzmann – Université Joseph Fourier - Grenoble I – Institut National Polytechnique de Grenoble (INPG)

inria-00345285, version 1
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From: Nicolas Holzschuch <>
Submitted on: Monday, 8 December 2008 18:25:08
Updated on: Saturday, 16 March 2013 23:01:31

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DOI: 10.1111/j.1467-8659.2008.01267.x

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