This is cool, especially because it renders so fast. When I read that
Christoph Hormann's isosurface landscape took 3 days and 21 hours.. I almost
stopped trying to use isosurfaces for big objects. But your scene even seems
to render at a reasonable speed when adding radiosity :)

I have one question though.. did you really render this without AA? When I
copy/pasted your code into povray, I got a very grainy result without AA, and
even with AA 0.3 turned on, it by far doesn't look as smooth as the one you
posted.

-- 
#macro C(X,Y)cylinder{X*x<X,0,-Y/2>.1}#end#macro U(R,X,Y)intersection{torus{.9
.1}box{-1 0rotate y*R*90}translate<X,0,Y>scale 1-z*.5}#end union{U(0,0,0)U(1,0
,0)U(2,-1,-1)U(1,1,0)U(1,1.5,-3)U(1,2,0)U(3,1,0)U(2,2,0)U(0,3,0)U(3,2,.5)C(.1,
2)C(.8,1)C(.8,-1)C(1.1,1)C(1.9,-1)pigment{rgb 10}rotate x*90translate<-1,0,4>}

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