Hello

There seems to be a bug in the f_rounded_box function
when used with a zero radius. The documentation reads
for this case: "Zero gives square corners".
When used in an isosurface this appears to right only if
the bounding box exactly fits the now not more *rounded* box.
But if the bounding box is slightly increase there appears
a broken surface.

The first image shows an isosurface with exactly fitting bounding
box (means contained_by{ box{...} }) whereas the second one
shows the same isosurface with slightly increased bounding box.

The scene file is in p.b.scene-files.

Is this a known problem/bug?
I'm using POV-Ray 3.6.1
linux gcc (GCC) 3.3.5 (Debian 1:3.3.5-13).

Regards,
Sebastian

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