"Sebastian H." <van### [at] gmxde> wrote:
> Alain wrote:
> > It's obvious that in that case, the axis of the cylinder is undefined:
> > it's impossible to know it's orientation.
>
> I second that. There's simply not enough information to define the
> object. But why should POV make wild guesses of what it could have
> been the user intended. Just drop the thing like a box/sphere of zero
> volume. I would prefer just a warning message and no fatal error
> in that case.
>
> Sebastian

POV doesn't need to think to 'drop' zero volume spheres and boxes.  They
have no diminesional surface for rays to intersect so they can be left in
the scene as is without causing parsing problems, the individual rays will
pass by them unhindered without POV having to alter the scene.  This is not
the case for cylinders, POV would need to be able to think to see that a
cylinder is degenerate and remove it because of the problem with them as
its been explained.   This additional thinking by POV may add to the
parsing overhead.


-tgq

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