I'm having trouble thinking through a transformation problem, and I'm 
pretty sure this isn't too crazy of a problem.
The idea is that I have an object centered at the origin, let's say a 
thin oval with the major and minor radii along the x and z axes, (so the 
normal on the flat face is in y). I want to rotate this so the x and y 
axes are pointing in the direction of two arbitrary (normalized and 
perpendicular) vectors.

transforms.inc has the Point_At_Trans(newY) that will do half this 
problem, but if I want to then rotate the x axis to align with another 
vector, it will mess up the original translation.

The object can then be translated to be centered at a given point, but 
that part is easy.

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