Update: Lot's of change in the side view so it changed the profile quite a bit.

Vlado : this is not GGX but I made a lot of test yesterday. If I wanted to have mostly the same result has now ( wich I like ) I had to use 3 layers of reflection instead of 4 and it render 40% faster
That's good. But somehow it's changing a bit the color of the diffuse, I don't know if it's the ggx shader that get the right color or the blinn blend. I will show you today.
Vlado : this is not GGX but I made a lot of test yesterday. If I wanted to have mostly the same result has now ( wich I like ) I had to use 3 layers of reflection instead of 4 and it render 40% faster

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