This seems inefficient to compute in practice. I'm wondering if such calculation is used in practice, or if there exists simple approximations for this?
yzliu567
Normally this result is estimated by sampling several directions. BRDF importance sampling is an example.
This seems inefficient to compute in practice. I'm wondering if such calculation is used in practice, or if there exists simple approximations for this?
Normally this result is estimated by sampling several directions. BRDF importance sampling is an example.