Refraction Exit Color!

[LP.]

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

[romullus]

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

[Gabriel Sumner]

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

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.

[LP.]

@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