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Schlick Phase Function<br />

accurate shape of phase function not so<br />

important<br />

use equation of ellipse to approximate<br />

Henyey-Greenstein<br />

p(θ) =<br />

1−k 2<br />

4π(1+k cos θ) 2<br />

k is similar to g in Henyey-Greenstein

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