Simulating a camera lens coating shader...

[evanerichards]

Any ideas how I would go about simulating a shader for a camera lens coating?

See the pictures for reference:




I don't even know how to describe it. Its kind of purple, its kind of green depending on the angle. Sometimes it looks clear, sometimes it looks colored.
I'm assuming you'd have to use some Fresnel action in there somewhere but I'm having trouble pinning it down. And suggestions?

[Morbid Angel]

Is this something you are looking for? its a bit extreme but can be controlled.

[evanerichards]

Yeah. Something like that. Even just as a starting place.
It probably beats what I've got right now which is sort of a circular red/green gradient mapped into the reflection color slot. It looks all right, but there has to be a better way. I'd love it if you could sort of lay out a recipe for how you made that shader.

[Morbid Angel]

hah, well it is pretty close to what you have and I spoke to a friend of mine and he suggested pretty much same thing. There is two ways you can do this as I did, place an RGB ramp with sampler info as facing ratio, into your refraction slot, this will color your refraction or you can do it to your reflection as well, or as in my case I did it to both. With that you can control the color of the facing ratio to get the color that you want. I don't think there is any proper way to get this kind of effect, unless some one writes a shader for it, I think maxwell has one.