Rendering 101 pt. 2: Theory- Materials, BxDFs, Fresnel & Microfacets
Added 2019-12-05 08:01:00 +0000 UTCBright petrol green plastic, warm shiny copper, clear glass, waxy jade - materials define how objects in a scene appear. But how do we model this plethora of appearances? Let's talk BxDFs, Fresnel and microfacets!
Everything Has Fresnel on Filmicworlds:
http://filmicworlds.com/blog/everything-has-fresnel/
Thx to Mike from https://www.mrpost.ru/en for inspiring the microfacet visualizer!
Comments
I have a question, is there a way to optimize render time for a layered material, where I have lets say plastic mixed with transparent material and gold? It looks great, but once transaparent layer and gold is added it jumps up like 8 times in render time. thanks!
Catalysee
2021-11-11 07:52:42 +0000 UTCI just wanted to add a quick note. First things first: you are doing a great job, explaining complex stuff with simpler approximations! But here some things are wrong and misleading, so I wanted to jump in: the total internal reflection is only happening, when light travelling in a denser medium strikes the surface of a less dense medium. In a typical CG rendering, where the camera is in 'air' and we are rendering denser objects, this would not be the case. The fresnel falloff is smooth, otherwise we would se a harsh line on the specular reflection of dielectrics.
Maxim Capra
2020-10-19 08:04:23 +0000 UTC
