Dialog Box: Rotate on Crystal Vector [Rotation Menu]
This will rotate about a rational crystal direction [uvw], regardless of the current display mode or orientation of the crystal. If you are drawing a molecule and have used Cartesian reference axes, the rotation direction is simply a vector with the coefficients u, v and w in the original molecule axis directions a, b and c. The indices or coefficients refer to a coordinate system fixed with respect to the crystal (always rotating with it). In Crystal (not Cartesian) SHAPE the indices must be integers, but this is not a bar in practice to rotation about irrational vectors, since the indices may take very large values.
Each time you click the Rotate button, a rotation is added to a master rotation matrix; the number of such rotations is listed at the bottom of the dialog box. When you have finished rotating, click the Done button and the master rotation matrix is applied to the crystal. If you click Cancel , no rotations are applied.