On Tue, 21 Jul 1998 20:06:58 -0600, Nathan Kopp <nk8### [at] ltuedu> wrote:
>Ron Parker wrote:
> [clip]
>> This works fine when the object isn't transparent, but it leads to
>> unexpected interior surfaces for transparent objects.  To make the problem
>> go away, one could replace CSG_Union_Methods with CSG_Merge_Methods, but
>> since merges are more expensive than unions, it might be preferable to have
>> a keyword that causes the merge methods to be used instead of the union
>> methods when the scene requires it.
>
>
>This bug was brought up in povray.newusers by Alain Culos and Saif Ansari
>a few days ago (see the thread "CSG"). At that time I let the POV-team know
>about the bug (and its fix).  I did not consider, however, that merge is
>slower than union.  If the choice of union/merge for inverting a difference
>is allowed, though, I think that the default should be a merge, and
>experienced users could use the union when they know that it won't hurt
>the scene.

Thanks.  I hadn't read povray.newusers before; maybe I should start.  If you
would, please convey my workaround to those who might be interested in it and
haven't seen it here.

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