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    • Issue 2
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    Hierarchical Radiosity for Dynamic Environments

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    Date
    1997
    Author
    Shaw, Erin
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    Abstract
    This paper extends the hierarchical radiosity method to environments in which geometry and surface attributes can be changed dynamically. New algorithms are presented for maintaining an appropriately-sized mesh and speeding the construction of the corresponding linear system. Mesh folding, the unrefinement of a mesh, is used to optimize mesh size while maintaining a specified error tolerance. Two new interactions are introduced: shadow links guide local shadow clean up after a change in geometry and ghost links guide global mesh folding after a change in surface attributes. The algorithms stabilize the memory requirements of dynamic scenes. Different types of interactions are analyzed to determine how they are affected by changes in geometry. A dynamic scene-partitioning scheme called a motion volume, used in conjunction with a three-dimensional clipping algorithm, provides a fast way to cull interactions that do not need to be updated. The algorithms are demonstrated on several sample scenes.
    BibTeX
    @article {10.1111:1467-8659.00127,
    journal = {Computer Graphics Forum},
    title = {{Hierarchical Radiosity for Dynamic Environments}},
    author = {Shaw, Erin},
    year = {1997},
    publisher = {Blackwell Publishers Ltd and the Eurographics Association},
    ISSN = {1467-8659},
    DOI = {10.1111/1467-8659.00127}
    }
    URI
    http://dx.doi.org/10.1111/1467-8659.00127
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