BTW, the doc's description of turb_depth is not very clear (at least to me):

"Additionally the fog turbulence may be scaled along the direction of the
viewing ray using the turb_depth amount. Typical values are from 0.0 to 1.0 or
more. The default value is 0.5 but any float value may be used."

What does 'may be scaled' mean? Is it the *size* of the turbulence
effect--scaling with distance-- or is it the *amount* of turbulence that
changes? The meaning is hard to discern, visually.

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