Iray Oil slick effect

Szark

Anyone had good results in getting different variations in colour with an oily surface on liquid? If so can you please share?

Rafmer

This is all I got after applying an "oily" top coat.

Rafmer

Thickness of the Top Coat Thin Film seems to play the most important role. I made some renders with different values; the one in the previous post was using a thickness of 10000.

The value is measured in nanometers; so we are talking about very thin "surfaces". Highers values close to a milimeter resulted in very odd results. Maybe, polygon density of the water volume might help too.

Rafmer

And, of course, IOR also played a major role. All of the above renders were using an IOR of 1.55. I did a couple more with 1.45 and 1.50. Hope it helped with what you were trying to achieve.

Szark

Oh yeah that does help big time Rafmer, thank you so much. I did know some of this but not enough to bring it all together. I really do appreciate your efforts It will be a big help.

Rafmer

You are welcome Szark. I like experimenting with shaders. By the way, the water volume polygon density didn't help at all.

Szark

I think a water volume mesh is really only good for Abbe and too some degree SSS, that is what I found and since this is a thin coat surface attribute I didn't think an enclosed mesh would help. But it is good to get someone else to confirm things. LOL

Szark

@Rafmer when you say 20K do you mean 20000 nano

Rafmer

Szark said:

@Rafmer when you say 20K do you mean 20000 nano

Yes, you are right.

Szark

cool just making sure. Thx again.