Making a CSG difference leaves only the first component visible. You must
either difference both cylinders separately with the same cube - or better
yet, make a union of these cylinders and difference this union with the
cube.

Margus

psl### [at] nmiacom wrote in message <36d73c9a.0@news.povray.org>...
>I am currently working with POVLAB.  I have a basic understanding of CSG's
>in POVRAY, and have started working with POVLABs supported CSG option, but
>am having some trouble.  Basically, I'm trying to make a hole between 2
>objects, but I can't get it to work.  Is this simply a POVRAY
>impossibility, or a POVLAB limitation?  I have 2 tubes, both of which are
>vertical.  When I put something between them, like say a cube, and then
>perform a CSG Difference operation on ONE tube and the cube, the cube
>makes a succesful hole in that tube as expected.  However, I have no clue
>how to make a hole clean through both tubes.  I performed different
>Difference operations, but the only thing I usually wind up with is 2
>invisible tubes with the cube as visible.  I've tried playing with the
>function, but I cannot seem to get this to work.  I respectfully ask for
>some serious help....I can't seem to figure it out.  Thanks in advance...
>
>------------
>psl### [at] nmiacom
>

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