Search found 3 matches

by andcoder
Mon Jul 15, 2013 1:19 am
Forum: Rendering
Topic: Cycles: Fresnel term is incorrect - changes are needed.
Replies: 8
Views: 22530

There we no changes made as far as I can see. Here is the .blend file I used to render those pictures above: http://and.intercon.ru/temp/cycles/cycles_ggx_fresnel_test.blend.zip 2.68 rc1 still has that issue :/ I spent quite some time digging into the internals of cycles but it looks like there is f...
by andcoder
Tue Jun 04, 2013 11:35 am
Forum: Rendering
Topic: Cycles: Fresnel term is incorrect - changes are needed.
Replies: 8
Views: 22530

There were a lot of studies by people who came up with those lighting models and distribution functions a long time ago. We just apply and rely on results of those studies. I can't argue with that but I can show some of test and results that I got. So far they are consistent. Here is a paper bag, fo...
by andcoder
Thu May 30, 2013 1:26 pm
Forum: Rendering
Topic: Cycles: Fresnel term is incorrect - changes are needed.
Replies: 8
Views: 22530

Cycles: Fresnel term is incorrect - changes are needed.

I was doing some 3D scanning and rendering recently, trying to match real photographs as closely as possible. But in a lot of cases Cycles would produce very strange and highly unrealistic results while other engines like YafaRay and Mitsuba don't have those problems. Cycles is great, its node syste...