Among other things, Edward Coffey wrote:

> (well, superellipsoids actually, which makes
> it hard to know exactly where in the y axis to place the object to get
> it to stand on its end - I rendered this one with the same translation
> as the 3x3x3 version so the white superellipsoid sticks through the
> floor):

The function/macro "trace" could be useful for that.

-- 
light_source{9+9*x,1}camera{orthographic look_at(1-y)/4angle 30location
9/4-z*4}light_source{-9*z,1}union{box{.9-z.1+x clipped_by{plane{2+y-4*x
0}}}box{z-y-.1.1+z}box{-.1.1+x}box{.1z-.1}pigment{rgb<.8.2,1>}}//Jellby

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