Ross wrote:
> 
> forgive me for asking what you mean by "you would not have mistaken union as
> a CSG operation"? the documentation says "There are four basic types of CSG
> operations: union, intersection, difference, and merge." then goes on to
> explain Union as a CSG operation in 3.3.6.2.

The documentation is quite sparse in that section but still it should be 
obvious that union is something quite different to merge, intersection 
and difference - it just groups the object but does not change the way 
they are rendered.  But indeed the docs could explain this in more 
detail since it is quite important - there also is a FAQ entry about it:

http://tag.povray.org/povQandT/miscQandT.html#csgspeed

Christoph

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