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Soft Textured Shadow Volume
Author(s) -
Forest Vincent,
Barthe Loïc,
Guennebaud Gaël,
Paulin Mathias
Publication year - 2009
Publication title -
computer graphics forum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.578
H-Index - 120
eISSN - 1467-8659
pISSN - 0167-7055
DOI - 10.1111/j.1467-8659.2009.01488.x
Subject(s) - computer science , shadow (psychology) , computation , object (grammar) , computer vision , artificial intelligence , discretization , computer graphics (images) , constant (computer programming) , algorithm , mathematics , psychology , mathematical analysis , psychotherapist , programming language
Efficiently computing robust soft shadows is a challenging and time consuming task. On the one hand, the quality of image‐based shadows is inherently limited by the discrete property of their framework. On the other hand, object‐based algorithms do not exhibit such discretization issues but they can only efficiently deal with triangles having a constant transmittance factor. This paper addresses this limitation. We propose a general algorithm for the computation of robust and accurate soft shadows for triangles with a spatially varying transmittance. We then show how this technique can be efficiently included into object‐based soft shadow algorithms. This results in unified object‐based frameworks for computing robust direct shadows for both standard and perforated triangles in fully animated scenes.