System and method for importance sampling of area lights in participating media
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United States of America Patent
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Feb 16, 2016
Grant Date -
Oct 11, 2012
app pub date -
Feb 17, 2012
filing date -
Feb 17, 2011
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Abstract
Provided are systems and methods that address the problem of single scattering in homogeneous volumes. In one implementation, an importance sampling technique is provided that avoids a singularity near point light sources. The system and method can be extended to the situation of area lights of arbitrary shapes. The error caused by the non-constant distance to the finite-extent area light is distributed by using random sample points within the area light as points from which lighting is calculated for sampling points along the ray.
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