In article <395C05D7.36D917D0@pacbell.net>, lin### [at] povrayorg 
wrote:

> It is important to remember that a HF object is much like a sheet of
> paper. It is considered an infinately thin object. So trying to make
> a hole in a HF requires that you provide the hole material for it.

Actually, it is infinitely thick, though it is still classed as a 
"finite solid primitive". All points -y of the surface are "inside". It 
doesn't have visible sides, but you can still see their effect in some 
CSG's.

-- 
Christopher James Huff - Personal e-mail: chr### [at] maccom
TAG(Technical Assistance Group) e-mail: chr### [at] tagpovrayorg
Personal Web page: http://homepage.mac.com/chrishuff/
TAG Web page: http://tag.povray.org/

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