New iridescent material

[moony]

Check out the second half of this thread

Micro/angle dependent Roughness & Iridescence

I have created this thread to discuss and further develop the “micro roughness” effect - whereby the apparent roughness of a semi-glossy material falls off at grazing angles - thereby making reflections sharper. I have already created a node group to simulate this effect and a BDRF solution to this effect has also been described in a siggraph paper - both linked below. These two images show an arc vis scene from Blendswap both without (top image) and with (bottom image) the effect active. …

And this one:

A complex approach - Iridescence in cycles

I was wandering today on how to make a more accurate iridescence effect. I know that using the layer weight and a rainbow ramp can produce some acceptable look, but not quite accurate. The big problem, is that cycles will color all the scattered rays with the same color at the point being rendered and not each ray by their own direction. So i was thinking how to overcome this, and have something more real. And then i remembered that the samples for each pixel don’t hit everytime in the same pr…