Timwi <tim### [at] gmxnet> wrote:
> Try rendering this with use_iso set to 0 and then with it set to 1. I
> would have thought the two should produce pretty much the same result,
> since the isosurface is equivalent to the cylinder.

As a matter of fact, POV 3.6 *does* produce identical results for cylinder and
isosurface version.

The current POV 3.7 beta renders properly if you add an "inverse" keyword to the
isosurface, for yet unexplained reasons. The beta page does not mention any
intentional change to isosurface behavior, and in fact only lists one single
change related to isosurfaces:

-------------------------------------------
Changes between 3.7.beta.25 and 3.7.beta.26
-------------------------------------------
....
Apply isosurface cache fix suggested by Lukas Winter in
<47c5b8b6$1@news.povray.org>.

So the cache fix might have broken something; however, it may already have been
broken earlier in the 3.7 development process of "C++-ifying" the code.

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