Hello, and Thanks ahead of time for any help!!

I'm a chemist and use Povray to render my molecules and it works great.
I've also made short animations of molecules spinning in space, no problem.
 Now I have hard one that I need help with.  I made a simple structure and
I manage to define it into pieces. I want piece 1 to remain stationary, but
I want piece 2 to rotate 180 degrees about and axis.  Sounds easy, but I
can't define this axis, whenever I rotate the molecule, it always uses the
origin (where my wanted rotating piece 2 is no where near) and a second
point that I can define. This generates images of bonds breaking and atoms
flying off.  Can anyone help??  The povray guides keep talking of vectors
and I want to define a vector (<X, Y, Z>, <x, y, z>) as my axis to rotate
around.

Thanks again,

Charlie R.
Univ of NV, Reno

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