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Light transport theory
From Wikipedia, the free encyclopedia
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Please help improve this article or section by expanding it. Further information might be found on the talk page or at requests for expansion. This article has been tagged since January 2007. |
Light transport theory deals with the mathematics behind calculating the energy transfers between mediums that affect visibility. This article is currently specific to light transport in rendering processes such as global illumination and HDRI.
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The amount of light transported is measured by flux density, that is flux per unit area.
Given a surface S, a hemisphere H can be projected on to S to calculate the amount of incoming and outgoing light . If a point P is selected at random on the surface S, the amount of light incoming and outgoing can be calculated by its projection onto the hemisphere.
The hemicube model works in a similar way that the hemisphere model works, with the exception that a hemicube is projected as opposed to a hemisphere. The similarity is only in concept, the actual calculation done by integration has a different form factor.