...based on an approach by Vahur Krouverk for fake lightsourced clouds.

I thought I'd share this even though it's not very big and only backed
up by very messy code. Also, it is slower than media and not really as
pretty - I think I'm on to something here. It is a pigment done with
functions (no normals or displacements) applied to a large sky dome. (I
am _very_ grateful for the inclusion of functions in POV 3.5 and look
forward some day to a full shading language).

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