> rendered with 8x8x8 cubes (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):

You may want to use the macro Round_Box_Union() (Or Round_Box_Merge) 
from shapes.inc. It'll look (almost) the same, and you'll always know 
exactly how large the shape is.

HTH,
Florian

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