Search found 7 matches

by patlefort
Thu Apr 20, 2017 5:20 am
Forum: Visuals
Topic: Glitch Pictures anyone?
Replies: 72
Views: 70468

Re: Glitch Pictures anyone?

Image

Fail trying to use sobol sequences with bidirectional path-tracing.
by patlefort
Wed Sep 14, 2016 6:02 am
Forum: Visuals
Topic: Bi-layer, anistropic, multi-scattering microfacets
Replies: 3
Views: 10538

Re: Bi-layer, anistropic, multi-scattering microfacets

Coincidentally I was looking at the problem of layers in the last few days trying to improve clear coating. It's possible to account exactly the amount of light reflected by the bottom layer if you assume that the light will hit the same microfacet always, just like you can do with a thin glass mate...
by patlefort
Mon Sep 12, 2016 8:57 am
Forum: Visuals
Topic: Bi-layer, anistropic, multi-scattering microfacets
Replies: 3
Views: 10538

Re: Bi-layer, anistropic, multi-scattering microfacets

Nice renders :)

I'm curious by what do you mean by bi-layer, multi-scattering microfacet model?

Is it GPU or CPU?
by patlefort
Thu Jul 14, 2016 5:42 pm
Forum: Visuals
Topic: Glitch Pictures anyone?
Replies: 72
Views: 70468

Re: Glitch Pictures anyone?

It's possible to not fail affine transformation for a sphere if you transform the ray into the local coordinate of the sphere.
by patlefort
Fri Jul 01, 2016 8:58 am
Forum: Tools, Demos & Sources
Topic: Direct Light Integration using MIS
Replies: 11
Views: 7186

Re: Direct Light Integration using MIS

Small typo in the code: search for salmpleLight.
by patlefort
Thu Oct 29, 2015 8:02 am
Forum: General Development
Topic: Basic question: material that will change the normal
Replies: 3
Views: 5317

Re: Basic question: material that will change the normal

You definitely need to calculate it before doing any shading calculation as they should be based on this normal. You should keep a copy of the surface real geometric normal along side and use that to displace the starting position of rays to avoid self-intersection.
by patlefort
Sun Jul 12, 2015 4:54 am
Forum: General Development
Topic: Float versus double
Replies: 12
Views: 8629

Re: Float versus double

I would use float unless you have specific needs for the precision of doubles. With floats, you can fit a vertex inside a single SSE register or you can perform 2x more operations at the same time. It'd be great if one day we can use doubles without worry but for now it's not worth the performance l...

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