Am 30.10.2018 um 04:58 schrieb Robert Munyer:
> 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?

No; it's a known issue that is fundamental to the way POV-Ray does 
constructive solid geometry.

> 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?

That's really a legal question, and therefore outside the scope of these 
newsgroups; you better consult a lawyer about this. All I as a layman 
can say is that as far as I am aware, there is nothing intentionally 
inherent in POV-Ray or its terms of use that would imply one or the other.

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