Chaos Corona Forum

Chaos Corona for 3ds Max => [Max] I need help! => Topic started by: LP. on 2016-08-08, 03:31:58

Title: Refraction Exit Color!
Post by: LP. on 2016-08-08, 03:31:58

hello,

I am getting some black patches while rendering a diamond. After a certain numbers of depth rays creating artifact which is obvious. Any possible solution would be help full.

Thanks for your time,
G_G

Title: Re: Refraction Exit Color!
Post by: romullus on 2016-08-08, 09:25:51

I don't think it's exit colour problem. After setting rays depth to maximum, it should be undetectable in your case. Anyway, you can easily check that for yourself - set exit colour to some bright pink-green-whatever colour and see if anything changes in your picture. Settings for exit colour is located in render setup>performance>dev/debug stuff

Title: Re: Refraction Exit Color!
Post by: Gabriel Sumner on 2016-08-08, 09:40:03

Hi G-G,
if you look at a photo of a diamond, you will notice the many internal ray refractions / reflections which occur in real life. E.g. take a look at the picture in this article:

https://www.sciencenews.org/article/most-diamonds-share-common-origin-story (https://www.sciencenews.org/article/most-diamonds-share-common-origin-story)

Take a closer look at your environment, there's probably a black spot (or the "sky" / environment color), which is causing this. You can try to get reed of it by carefully placing bounce cards in your scene.

Title: Re: Refraction Exit Color!
Post by: LP. on 2016-08-08, 19:45:34

@romullus

Thanks for correction, yes  this is not related with exit color. i tried few changes (change HDRI as well shader setting) which lead to result. I think the result is quite satisfied at the point .

@Gabriel S.

Thanks for your input. The diamond tagged there is 3D? Why the internal refraction goes dimmer as along they travel through even in 3d space where no impurity or imperfection?

http://www.techinsider.io/how-to-tell-if-a-diamond-is-real-2015-11