Opal Material

[pauljs75]

If I recall correctly, it was a side-topic development from a discussion on this big thread:

A complex approach - Iridescence in cycles

I didn’t detail read any of the blends/materials, but I got the impression that none of this is based on light position? I read hard coded and so on a couple of places. Is this useful in your ventures? [image] The red node is the key to the trick, where you just select the light. Obviously you would have to add the effect to work on all lights you want it to consider (may get ridiculous in complex lit scenes), rather than on a material basis as it should be (but impossible due lacking closur…

The underlying ideas for how the material was created are in there somewhere.

There was another related topic at the time, but I don’t recall the exact title of it.