Hi Ray Gardener, you recently wrote in povray.general:

> Well, CSG is undoubtedly a challenge.
> As long as "extremely hard" doesn't
> wind up becoming "intractable" I'm
> willing to forge ahead. In the reverse
> direction, I would love to see Moray
> display POV CSG objects.
Well, it can display them (after you do evaluate), but it doesn't
always work and the result, while displaying nicely on the screen, is
actually quite ugly once you look at it :-) But if all you want is
screen display, then yes, it's not intractable.
 
> In REYES, which tesselates down to
> micropolygons, one can consider the
> 3D location of the polygon to be
> inside or outside another primitive, and
> thus cull it at render time. 
That would be a nice way, but you're running into boundary conditions
as well that you need to be aware of. Because you're often going to
end up testing polygons against the boundary of the object... but if
you kept track to which object the polygon belonged, you could avoid
testing against it... sounds promising.
I guess the problem can be solved differently at rendering time.

Regards,

- Lutz
  email : lut### [at] stmuccom
  Web   : http://www.stmuc.com/moray

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