Hello,

Here's my attempt at recreating an opal. It's not physically accurate.

It's a mesh stone shape, with many mesh inclusions. Each inclusion is a 
disc-shaped chip, colored randomly, and given a specular highlight with 
a metallic value of one to really bring out the color. They were placed 
randomly. The ones residing inside the stone were rendered, the rest 
were not.

Funny thing, the luminous bloom pass took longer to complete than the 
initial render itself. For some reason the black parts of the HDR image 
were the slowest. It could be an error in my code...

Sam

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