Um, this is probably over my head, but I think that most of the advice here
is based on a question of how to do multiple povray-style, rotations off
the universal axis.   I'm trying to implement the Euler rotations using the
convention of Bunge.

What I need to do is  to take a cube centered on the origin and rotate it
first around the z axis. (No prob: universal and local are the same).

Then rotate the cube not about the x axis, not of the universal axis but its
own new local axis.

Then another rotation about the local z axis.

I can do this with my fingers no prob, but trying to get pov to do it makes
my head hurt.

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