Method and apparatus for environment-mapped bump-mapping in a graphics system
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United States of America Patent
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Apr 17, 2007
Grant Date -
Mar 3, 2005
app pub date -
Sep 30, 2004
filing date -
Aug 23, 2000
priority date (Note) -
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status (Latency Note)
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Abstract
Apparatus and example methods for environment-mapped style of bump-mapping (EMBM) are provided that use a pre-computed bump-map texture accessed as an indirect texture along with pre-computed object surface normals (i.e., the Normal, Tangent and Binormal vectors) from each vertex of rendered polygons to effectively generate a new perturbed Normal vector per vertex. The perturbed new Normal vectors are then used to look up texels in an environment map. A specialized bump map texture data/coordinate processing 'bump unit' is provided in the graphics pipeline for performing predetermined matrix multiplication operations on retrieved lookup data from the indirect-texture bump map.
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Cited Art Landscape
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