July 2015
Intermediate to advanced
586 pages
17h 21m
English
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272 III Lighting
5.4.1 Putting It All Together
Given an emissive plane, begin by capturing the radiance and opacity in a texture
map (R). The image pyramid for irradiance queries is generated from R as follows:
1. Generate a standard mipmap chain for the texture map R. Eachmipmapis
a half-size boxfiltered down-sample of the previous. Let R
be the resulting
image pyramid. It contains radiance in RGB and opacity in A. The opacity
value is not used for the irradiance pyramid generated here, but is required
for the cell-to-cell propagation step described later in Section 5.8.
2. Allocate the irradiance image pyramid I. It will have the same dimensions
and ...
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