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2 votes

Confusion about PDF defined in solid angle / area measure

Actually,shape->Sample(ref, u, pdf) returns the pdf in solid angle measure.The sample function in sample is actually this. ...
袁军平's user avatar
1 vote

Confusion regarding incident direction in render equation

$L_i(p,\omega_i) = L_o(p+t\omega_i,-\omega_i)$ where t is some distance to another point, so $\omega_i$ is "positive" (-) when evaluating $L_o$ but "negative" (+) for $L_i$. So if $...
Mathis's user avatar
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