This scene was designed by Aaron Collins, IIRC.  It clearly shows that 
he wasn't any better an artist than I was :-).  It was actually to show 
that we could model parabolic shapes.  Early versions of DKBTrace could 
render only quadric shapes of the form:

	Ax^2 + By^2 + Cz^2
	+ Dxy + Eyz + Fxz
	+ Gx + Hy +Iz + J = 0

This is a superset of spheres, planes, paraboloids, hyperboloids, cones, 
  and cylinders so it made it easy to model all of these with only one 
primitive.  By DKBTrace 2.12 we had added planes, spheres and triangles 
as optimizations plus quartics (4th order shapes) submitted by Alexander 
Enzmann.

David Buck

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