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Questions tagged [ggx]

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1
vote
1answer
49 views

Can't understand the Importance sampling GGX

I've read many articles relating to importance sampling of GGX. However, I still feel confused. The formula of GGX is : And many article says we should use this formula to sample: In the formula, ...
0
votes
0answers
91 views

What is wrong with this GGX sampling function?

I wrote a small Shadertoy path-tracer a few days ago to teach myself PBR transmission/reflection, and I decided to use Heitz's microfacet sampling model since it's cleaner than the one in PBRT. I'm ...
2
votes
0answers
547 views

Explanation of math of the Smith G1 term

In appendix A of the paper Microfacet Models for Refraction through Rough Surfaces there is a derivation provided for $\Lambda(w)$ but the mathematics is very confusing. Could somebody help me by ...
6
votes
1answer
252 views

Dealing with blown-out highlights in PBR

I've been writing some custom shaders based around Unity's Standard BRDF, which is uses GGX distribution term and Smith visibility term. It looks great at either end of the smoothness scale (1 and 2 ...