IOR of Engine Oil

[hopbin9]

Hi,

Anyone know how I can find the index of refraction (IOR) for engine oil (10W30). I'm know water has an IOR of 1.33, and oil is lighter then water. So I'm assuming that a lower IOR would be logical. So maybe 1.2 would be a good guess, but does a lighter liquid naturally mean a lower IOR?

Thanks,

[hopbin9]

Playing around with the glass shader, and produced this strange looking fluid. Kind of like a waxy bee honey or something. Thought it was kind of cool

[hopbin9]

I can't figure out, how in Mantra PBR to set a glass shader's density fall off. Nothing seems to work.

This seems like a standard feature in must raytracers for transparent effects.

Any help?

[Macha]

Maybe this helps:

http://www.physics.uc.edu/~johnson/Boone/oil_page/refraction/refraction.html

[LaidlawFX]

I can't figure out, how in Mantra PBR to set a glass shader's density fall off. Nothing seems to work.

This seems like a standard feature in must raytracers for transparent effects.

Any help?

in h11 when using refraction adjust the attenuation that will do the falloff, you need to play with it a lot because it is scene dependent, for quick turn arounds uncheck everything and just focus on getting that setting to work.

[Jason]

Are you talking about absorption? Yes, there is no Side Effects-provided solution for that for PBR. It is possible to create the effect satisfactorily if you know how to write shader code though.

I can't figure out, how in Mantra PBR to set a glass shader's density fall off. Nothing seems to work.

This seems like a standard feature in must raytracers for transparent effects.

Any help?

[hopbin9]

Maybe this helps:

http://www.physics.u...refraction.html

Thanks. IOR of Oil is higher like 1.4, that will help a lot.

[Macha]

What I find interesting in this link is how we can see the change of wavelength causes a changes in iof. I suppose the angle parameter approximates this somewhat but hey, there's a challenge to ambitious shader writers!

Edited November 10, 2010 by Macha