http://proteopedia.org/wiki/images/7/76/Wobble.spt
jmol script to move molecule around a given orientation in a precession movement.
Preliminaries
A quaternion is an mathematical object (like a matrix or a complex number) with four parameters x y z w. It is useful to express orientations and rotations, and to do calculations (combining, interpolating, dissecting) on them. Jmol shows structures (e.g. atom positions) on a display and allows the view to be rotated and individual atomic positions to be manipulated.
Combining two rotations
Interpolating between orientations
Interpreting a rotation
