Am 16.06.2016 um 16:25 schrieb William F Pokorny:
> The code that follows should be rendering a sphere, but it doesn't for
> me in POV-Ray 3.7.1-alpha.8638272. It would be useful if others running
> the current master branch could confirm whether the same is seen -
> especially if seen in windows. Thanks.

I can confirm this issue for the Windows version as well. Some `#debug`
output of function results indicate that the function VM operates ok, so
we seem to be looking at an issue in the isosurface algorithm. (Also
note how fn01 through fn03 give a spherical shape, but broken shading.)

If anyone has sufficient time at hand to go through previous versions
and track down which version was the first to exhibit this problem, I'd
be much obliged.

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