The documentation explains the rendering problem that happens when one
of the surfaces of the minuend in a difference operation is coincident
with one of the surfaces of the subtrahend.
I've been encountering a similar-looking rendering problem even when
there is no such coincidence. In the scene attached below, I expected
the center of the image to be a green solid surface, not a speckled
"window" into the object's interior.
Question 1: Is this a bug?
Question 2: If this is not a bug but a problem in the scene file...
Suppose that Bar and Baz were written by different authors; which one of
them is responsible? Was the author of Bar supposed to avoid coincident
surfaces, even though he was just unioning some untextured solid objects?
Or conversely, was the author of Baz supposed to perform an audit of the
structural details of the objects that he was differencing, just in case
one of them might have its own subcomponents that have coincidences?
I'm using 3.7, and I get the same result on Linux or Windows.
(See PNG in message with same subject, in povray.binaries.images.)
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