Konferensartikel

Improved Diffuse Anisotropic Shading

Anders Hast
Creative Media Lab, University of Gävle, Sweden

Daniel Wesslén
University of Gävle, Sweden

Stefan Seipel
University of Gävle, Sweden

Ladda ner artikelhttp://www.ep.liu.se/ecp_article/index.en.aspx?issue=013;article=014

Ingår i: The Annual SIGRAD Conference. Special Theme - Environmental Visualization

Linköping Electronic Conference Proceedings 13:14, s. 57-58

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Publicerad: 2004-11-24

ISBN:

ISSN: 1650-3686 (tryckt), (online)

Abstract

Cloth; hair; brushed metal; and other surfaces with small; regular surface features exhibit anisotropic reflectance properties for which common isotropic shading methods are not suited. Shading of such materials is often implemented by computing the normal giving the maximum light contribution instead of solving the integral that is the sum of all reflected light. In this paper we show that this integral can be simplified if the direction to the viewer and fibre geometry is not taken into account. Still; this will give a more accurate result than the very rough simplification of using the maximum contribution. This computation is simple for diffuse light. However; the specular light still needs some more elaboration to work.

Nyckelord

Anisotropic shading; diffuse light

Referenser

D. BANKS 1994. Illumination in Diverse Codimensions. In Proceedings SIGGRAPH; pp. 327–334.

W. HEIDRICH; H-P. SEIDEL. 1998. Efficient rendering of anisotropic surfaces using computer graphics hardware. In Image and Multi-dimensional Digital Signal Processing Workshop (IMDSP); 1998.

P. POULIN; A. FOURNIER 1990. A model for anisotropic reflection. ACM SIGGRAPH Computer Graphics; Proceedings of the 17th annual conference on Computer graphics and interactive techniques; Volume 24 Issue 4; pp. 273–282.

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