Chaos Corona Forum

Chaos Corona for 3ds Max => [Max] I need help! => Topic started by: designbarros on 2015-02-03, 17:04:35

Title: Thin-Film look
Post by: designbarros on 2015-02-03, 17:04:35

Hello corona users,
http://blog.maxwellrender.com/tips/pushing-the-limits-of-realism-of-materials/ (http://blog.maxwellrender.com/tips/pushing-the-limits-of-realism-of-materials/)

i'm tried to get those results in my plastic, rubber shaders.
Anyone know how to do this on corona render?
I'm use a7.2 version, and i dont have daily builds.

Thank you guys, sorry for my bad english.

Title: Re: Thin-Film look
Post by: Juraj on 2015-02-03, 18:11:29

Unless you need interference effect (think of CD/DVD surface, that crazy rainbow), you can get the same effect (colored/additional) highlight  as in the article from blended coat layer via fresnel (using fallof) mask.

Title: Re: Thin-Film look
Post by: Juraj on 2015-02-09, 01:12:01

Looks like Vlado was able to code this in spare time:

http://forums.chaosgroup.com/showthread.php?81466-Thin-film-OSL-shader&p=643317#post643317

Based on this paper: http://www.gamedev.net/page/resources/_/technical/graphics-programming-and-theory/thin-film-interference-for-computer-graphics-r2962

Anyway, the paper clearly states there is only narrow range (of film thickness) when interference happens, outside of it, it's regular fresnel reflection.