In article <3872a859@news.povray.org>, "Patrick Dugan" 
<pat### [at] netinsnet> wrote:

> But WHY is there a torus depression?  The torus should carve out ONLY 
> where
> the intersection of the height field and torus intersect, not have an
> "extra" area showing outside of the heightfield.  While a "clear" pigment
> works it is still not behaving the way a standard solid object would.

I am not sure what you mean. It behaves in exactly the same way a 
standard object does. A difference operation leaves the surface of the 
differencing object on the object being differenced.
Don't get confused by the fact that you can see under the top surface of 
the height field, the object is there, there just aren't any surfaces 
around that portion of it. The lower boundaries are set by a cube, while 
the upper boundary is the surface of the height field. This can be seen 
clearly if you fill a height field with media.

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

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