In article <38b4ca25@news.povray.org>, "Mark Wagner" 
<mar### [at] gtenet> wrote:

> What you are looking for is a "symmetric difference" operation.  POV-Ray
> does not have this.

Not as a basic CSG operation, but I think this will do it...
difference {
    union {object {ObjA} object {ObjB}}
    intersection {object {ObjA} object {ObjB}}
}

Although I really don't see how this would be useful, except maybe as a 
part of another CSG operation or as a media container. Even with a 
transparent object, it should look almost the same as just using a union 
because of the surfaces left behind by the difference.

-- 
Chris Huff
e-mail: chr### [at] yahoocom
Web page: http://chrishuff.dhs.org/

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