Rotate on Cartesian Axes
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Dialog Box - called from: Rotation menu

This rotates the structure on one of two sets of Cartesian axes. If clinographic viewing is off, the structure is always rotated about one of the axes belonging to the observer system: x coming straight out towards the observer, y in the plane of the screen or paper pointing to the right and z upwards.

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 structure. If you click Cancel, no rotations are applied.