Search found 9 matches
- Tue Jul 11, 2017 1:59 am
- Forum: General Development
- Topic: MIS with IBL
- Replies: 14
- Views: 16040
Re: MIS with IBL
Re-reading your first comment, you say that another light may be visible when sampling the sky. When you select the sky, you have to shoot a shadow ray just like any other light source. If that shadow ray is occluded by another light source, it must not contribute anything, because it's the sky bein...
- Sat Jul 08, 2017 11:04 pm
- Forum: General Development
- Topic: MIS with IBL
- Replies: 14
- Views: 16040
Re: MIS with IBL
When your ray stumble upon a light source and you want to do MIS, you need to know the probability of it being selected. It's impossible to know that probability without having sampled random points on all other light sources in your sampling method. I'm not sure if doing that make sense and will co...
- Thu Apr 20, 2017 5:20 am
- Forum: Visuals, Tools, Demos & Sources
- Topic: Glitch Pictures anyone?
- Replies: 81
- Views: 122788
Re: Glitch Pictures anyone?

Fail trying to use sobol sequences with bidirectional path-tracing.
- Wed Sep 14, 2016 6:02 am
- Forum: Visuals, Tools, Demos & Sources
- Topic: Bi-layer, anistropic, multi-scattering microfacets
- Replies: 3
- Views: 15761
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...
- Mon Sep 12, 2016 8:57 am
- Forum: Visuals, Tools, Demos & Sources
- Topic: Bi-layer, anistropic, multi-scattering microfacets
- Replies: 3
- Views: 15761
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?

I'm curious by what do you mean by bi-layer, multi-scattering microfacet model?
Is it GPU or CPU?
- Thu Jul 14, 2016 5:42 pm
- Forum: Visuals, Tools, Demos & Sources
- Topic: Glitch Pictures anyone?
- Replies: 81
- Views: 122788
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.
- Fri Jul 01, 2016 8:58 am
- Forum: Visuals, Tools, Demos & Sources
- Topic: Direct Light Integration using MIS
- Replies: 11
- Views: 16336
Re: Direct Light Integration using MIS
Small typo in the code: search for salmpleLight.
- Thu Oct 29, 2015 8:02 am
- Forum: General Development
- Topic: Basic question: material that will change the normal
- Replies: 3
- Views: 7655
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.
- Sun Jul 12, 2015 4:54 am
- Forum: General Development
- Topic: Float versus double
- Replies: 12
- Views: 15056
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...