scott wrote:
>> POV-Ray is the only 3D modeller I've taught myself how to use.  I tend

>> to think
>> in terms of CSG; intersections, unions, differences, of spheres,
>> cones, planes,
>> boxes, etc.  Any modellers that would be easy to learn how to use that

>> would
>> allow me to work in the same terms but which would create a triangle
>> mesh?
> 
> Pretty much any 3D CAD software would fit the bill perfectly, but...
> 
>> Any
>> that are free?
> 
> ...they tend not to be free.  I'm not sure how well the likes of Blende
r
> handle CSG, but you could give it a shot, and it's not very parametric,

> so you can't easily go back and change the radius of stuff after you've

> made the model (like you can in POV and CAD software).
> 
> Another idea I had: When they receive a 3D mesh they must render it to 
a
> load of 2D bitmap slices at some point to feed to the machine.  I wonde
r
> if you contacted them, you could supply them with a load of monochrome
> bitmaps for each slice instead of the 3D data.  This would be easy to
> render in one go with POV.
> 
	I've never tried it, but you might want to take a look at BRL-CAD:
http://brlcad.org/

		Jerome
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