I can think of some situations where using the alpha channel for
reflection could be useful. (If you consider this a feature request, I
apologize.) For instance, in case one wanted to use a reflection to create
a distorted image of an object. Perhaps the renderer could use the
transmit component of the background color to determine how reflection is
handled (i.e. if the transmittance was 1, completely
reflective objects would be transparent.)

Since I didn't say so before, I'm really excited about the improved alpha
output. It's a powerful feature in any case.

John Haiducek

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