[Radiance-general] illum-like behaviour for sky dome

[Christopher Rush]

What about separating the skies into two different octrees, then
combining two images with pcomb? If you render your intended visible sky
with zero ambient bounces then it won't contribute to the scene
illumination in its image. And if the gensky is defined as an illum (or
somehow masked out afterward) it will contribute only to the scene
illumination and be otherwise invisible in the composite.

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