Peter Popov wrote:

> A height_field *is* solid -- it extends from its surface down to the
> x-z plane.

That is a bit misleading Peter. While HF's are solid from the point of
view that they may be used in CSG operations because pov can clearly
determine their inside and outside for all practical purposes they
are not really a solid object in as much as they are a triangle mesh
object that much more closely resembles a shell of an object and not
a solid object like a box or a sphere would be. You can verify this
yourself by making a HF object that looks like a mountain peak. If
you flip it over it will now look like a deep valley.

-- 
Ken Tyler -  1200+ Povray, Graphics, 3D Rendering, and Raytracing Links:
http://home.pacbell.net/tylereng/index.html http://www.povray.org/links/

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