Bob, This sounds good. I will try to get a look at it. I have rather limited network access at the moment, so don't expect much feedback for a while. On the rotations, I think I understand what you are talking about. Your problem is not the rotations, but deciding what set of coordinates end up in the 3-D projection, right? Try this on for size. Just use the linear combinations of the projections on your fixed visualization axes. That's what I did for some principle component analysis software I wrote. In that case the linear combinations were functions (actually spectral components), rather than plain vanilla vectors. Jonathan
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