In article <3A5237E4.F6F237A5@my-dejanews.com>, 
gre### [at] my-dejanewscom wrote:

> Voila!  I have cut through the parametric surface without cutting
> through the spheres! At no time does the brown box cut through spheres
> at <0,0,0> nor <0,0,1>!  (It does cut through the back half of sphere at
> <0,0,-1>, if you observe closely).

Just a wild guess...increase the max_trace for the parametric object, it 
may be messing up the rest of the CSG by only finding the first 
intersection. Or it might just be that they don't work in difference or 
intersection...similar to the limitation on bezier patches, polygons, 
etc...

-- 
Christopher James Huff
Personal: chr### [at] maccom, http://homepage.mac.com/chrishuff/
TAG: chr### [at] tagpovrayorg, http://tag.povray.org/

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