simian wrote:
>
> I noticed it just the other day. Make a scene with just the skysphere,
> no ground plane and look at the results. The "top" half looks almost
> the same, just a little different as some things do. The bottom half
> is completely different.

Maybe you use a gradient pattern which changed in POVRay3.5 (Docs,
6.7.11.17) for the negative direction.
If you want the old gradient, you may use a function {mod(abs(z),1)} or
something like this...
And the top half may uses some kind of noise (bozo,granite,etc) whose looks
changed due to the new noise_generator...

Kalle

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