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I have Great Stella and when I chose Poly --> Project onto Sphere, nothing happens. Does one need to be in a particular view or mode to use this command? Thanks.

What it does is project the vertices onto a sphere. You won't see any change to Platonic or Archimedean solids, for example, because their vertices already lie on a sphere.

If you want to make a polyhedron more spherical, you could try "Poly->Create Geodesic Sphere". That will subdivide the faces and project the resulting vertices onto a sphere.

Rob.