Now I'll have to find that to make I'm not hallucinating.  I was pretty sure
that the docs mentioned that clipping or differences cannot be performed on
"non" solid objects like height fields, dics, planes, etc.  If a difference
is supposed to work with a height field (like removing a box shape from a
height field) then I cannot get that to function correctly.  I will post
some example code that demonstrates my problem.

"Chris Huff" <chr### [at] yahoocom> wrote in message
news:chrishuff_99-8EA2F7.12251204012000@news.povray.org...
> In article <3872213e@news.povray.org>, "Patrick Dugan"
> <pat### [at] usticom> wrote:
>
> Forgot to answer this in my previous reply:
>
> > according to the Povray docs I shouldn't be trying a "difference"
> > with a heightfield.
>
> The height_field object works fine with CSG, where in the POV-Ray manual
> does it say otherwise?
>
> From the manual:
> "There are thirteen different solid finite primitive shapes: blob, box,
> cone, cylinder, height field, Julia fractal, lathe, prisms, sphere,
> superellipsoid, surface of revolution, text object and torus. These have
> a well-defined  inside  and can be used in CSG (see section "
> Constructive Solid Geometry "). They are finite and respond to automatic
> bounding. You may specify an interior for these objects."
>
> --
> Chris Huff
> e-mail: chr### [at] yahoocom
> Web page: http://chrishuff.dhs.org/

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