X-Caliber wrote:
> 
> I don't follow how they [planes] would actually work though, as
> opposed to boxes which are > 2 dimensional, therefore much saner
> to operate on 3 dimensional objects with.

Planes are three dimensional. You are looking at the surface, but 
everything "below" the surface is considered inside the plane. Look at 
this object, for instance:

intersection {
   plane { x, 1 }
   plane { -x, 1 }
   plane { y, 1 }
   plane { -y, 1 }
   plane { z, 1 }
   plane { -z, 1 }
   pigment { rgb y }
}
camera {
   location <5,5,5>
   look_at <0,0,0>
}
light_source {
   <25,250,500>
   color rgb 1
}

This makes a cube. Intersecting planes can also be rotated to make a 
faceted sphere, although a mesh would be tons easier. Rotate points 
around an axis and then connect the points with triangles.

  -Shay

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