How can render reflection alpha? like below
How can render reflection alpha? like below
That screenshot (and the Autodesk forum thread where it came from) are from the Arnold 4 days.
There's no AOV for the specular alpha, but you can fake it with a render layer (kinda like that screenshot) where you make the specular plain white (eg put a rayswitch on the helix and make only specular reflection white)
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