"Mirfaelltkeinerein" <nomail@nomail> wrote:
> I experienced a problem with the lighting in a CSG scene, where a sphere_sweep
> is subtracted from a Round_Box: under certain angles the subtracted sweep gets
> dark spots and areas. This behavior occurs on version 3.7.0.msvc10.win64, on
> version 3.7.0.RC7.msvc10.win64, but NOT on version 3.6.2.msvc9.win64 (there
> everything looks fine).

The sphere_sweep object is buggy, especially with cubic splines.  The
development team is aware of these problems, but apparently solving them is very
sticky.

> Is there a solution to avoid this error?

For the short term, you might try out the SphereSweep module in the Object
Collection, which provides well-behaved approximations of sphere sweeps:

http://lib.povray.org/searchcollection/index2.php?objectName=SphereSweep&contributorTag=Cousin%20Ricky

Please note that the part of the documentation that says, "I have not
experienced artifacts with opaque sphere_sweep objects in POV-Ray 3.7, ..." is
incorrect as of this morning.  ;-)

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