So I recently came across this iridescent material, I'm unsure if all iridescent material behave like pic attached, but I shone my phone's flashlight on it and found some interesting behaviour.
The little blob of light without refractions is that actual reflection of the flashlight
My initial approach was to create multiple shaders which had their normals skewed to mimic the grid like behaviour scene here, and then go on to add them, but each of these would require to be split into three different shaders for red, green and blue, each of which would have smaller offsets to mess with the normals and add them together, but this seems like a rather inefficient method.
I tried to look up a few tutorials on youtube, and I've never felt that any of them really feel particularly iridescent like, anybody have any ideas on how to tackle this?