May 2014
Intermediate to advanced
522 pages
16h 1m
English
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4. Hi-Z Screen-Space Cone-Traced Reflections 169
cos
1
α
cos
64
α
cos
2
α
cos
256
α
cos
4
α
cos
1024
α
cos
16
α
cos
2048
α
Figure 4.19. Polar coordinate plot of the specular lobe with various specular power values. The red
ellipse is the specular lobe and the black isosceles triangle shows the cone angle extents using the formula
presented earlier; α is the angle and cos α is powered to various specular power values.
So, for any distribution model, we average at pre-computation time all the
reflection vectors within the specular lobe—importance sampling using uniform
random variables [0–1]—with a specific roughness value that gives the vector
where the reflection vector is
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