Radiance caching for efficient global illumination computation

    Authors

    J. Krivanek; P. Gautron; S. Pattanaik;K. Bouatouch

    Comments

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    Abbreviated Journal Title

    IEEE Trans. Vis. Comput. Graph.

    Keywords

    global illumination; ray tracing; hemispherical harmonics; spherical; harmonics; directional distribution; Computer Science, Software Engineering

    Abstract

    In this paper, we present a ray tracing-based method for accelerated global illumination computation in scenes with low-frequency glossy BRDFs. The method is based on sparse sampling, caching, and interpolating radiance on glossy surfaces. In particular, we extend the irradiance caching scheme proposed by Ward et al. [1] to cache and interpolate directional incoming radiance instead of irradiance. The incoming radiance at a point is represented by a vector of coefficients with respect to a hemispherical or spherical basis. The surfaces suitable for interpolation are selected automatically according to the roughness of their BRDF. We also propose a novel method for computing translational radiance gradient at a point.

    Journal Title

    Ieee Transactions on Visualization and Computer Graphics

    Volume

    11

    Issue/Number

    5

    Publication Date

    1-1-2005

    Document Type

    Article

    Language

    English

    First Page

    550

    Last Page

    561

    WOS Identifier

    WOS:000230346800009

    ISSN

    1077-2626

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