In article <slr### [at] fwicom>, ron### [at] povrayorg 
wrote:

> Open mesh surfaces are impossible, but that's because the term 
> "inside" has no meaning for one.

A height field is an open mesh surface with an "inside". :-)
Of course, it has a specific definition of "insideness", which I think 
is "Any point below the surface".

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

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