Pearl-ish shader?

#1

Hey guys,

I am using Vray with Maya 2010. Been trying to get this shader going with no luck.

It seems like a glass that has been sprayed with a pearl-ish looking paint. The reflection seems to have a turquoise blue in the dark areas and the bright highlights are pink-ish till white if it is a strong reflection. The base seems to have a rainbow look prior to becoming clear glass so I suppose a Vray Blend material from the blue/pink to clear glass refraction is how to solve that section.

I am really having a hard time getting this shader down. Please help. Thank you.



#2

looks like a spectrum to me (eg rainbow). I would render a spectrum ramp and multiply it into your reflections. Just a thought.

Also, look into thin film reflection
http://www.ualberta.ca/~pogosyan/teaching/PHYS_130/images/800px-Soap_bubble_sky.jpg

#3

I only see the spectrum happening at the bottom area just before it becomes normal glass.

Also, if it is a spectrum, can this happen where light is pinkish and darker areas are turquoise whilst rainbow for everything else?

Any ideas how to get a spectrum going with Vray material? Just multiply a ramp? I am trying it now btw.

So far, what semi works is making the diffuse a turquoise blue and the reflection color pink. But I can’t seem to get anything closer then that. It seems way more complex then a simple two color thing.

#4

Also, I tried to attach a ramp to the reflection color. I realized that it maps the color based on UV. What I want is to attach the ramp to the reflection based on color value. Dark is turquoise, Light is pink then white. How do I do this?

#5

You want to map a colour ramp based on the incidence angle (i.e. the angle between the light and the surface normal), not the light’s brightness.

#6

I think that playmesumch00ns has the right approach here. The phenomenon you’re attempting to recreate is called iridescence. I did a quick search on Wikipedia about how iridescence works and it says: “Iridescence is an optical phenomenon of surfaces in which hue changes in correspondence with the angle from which a surface is viewed”. The best way that I know how to do that is to use the facing ratio node.

#7

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