Nieminen Juha wrote:

>   If the box were clipping the sphere, we would see a circular section of
> the box. Instead, we see a regular sphere. Why? Because the projection of
> the box on screen completely covers the projection of the sphere on screen.
>   The 'intersection' has no effect here.

Ok let's agree that it is not a clipping operation but in the least it is
effecting the shape of the object presented on screen. In that regard the
bounded_by statement can and will when used (im)properly affect an objects
shape and can be used somewhat like a csg operation can. Although it's
probably not a good idea to use it regularly it has possibilities. Foremost
of these are the fact you don't have to worry about parent/child texture
problems and there are no open object situations as seen with a clipped_by
operation.

-- 
Ken Tyler

See my 850+ Povray and 3D Rendering and Raytracing Links at:
http://home.pacbell.net/tylereng/index.html

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