I'd like to add that the torus object never gets translated far from the
origin (it's distance from (0,0,0) is approximately 1000).
Is it possible to use some additional keyword in addition to "sturm" to
specify how to raytrace the torus ? Might specifying the torus directly
as a quartic polynomial (how ?) instead of using the torus keyword solve
this problem ?
Bjorn
