Initial Orientation
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Dialog Box: Initial Orientation [ Input2 Menu]

Any initial Cartesian rotations specified here will be be applied to the x, y and z crystal Cartesian axes (see section IV-4) in that order after the faces, corners, etc. are located and before the crystal is first displayed.

If the Clinographic viewing box is checked, the clinographic rotation (see Coordinate Systems) will be applied at the end of the calculation, after any initial Cartesian rotations. It may be turned off with the Clinographic Viewing command in the Rotation menu (or the ClinographicViewing command in the Display menu).

When exiting, SHAPE checks to see if the orientation has changed from the initial orientation defined in this dialog. If so, you have the option of saving the current orientation. This orientation will be converted into initial rotations on x, y and z, plus initial clinographic viewing if that is in effect. You can also save the current orientation with the Save/Recover Orientation dialog in the Rotation menu.

Summary of orientation operations . SHAPE first sets the c crystal axis parallel to the z viewer axis, and the a * crystal axis (perpendicular to b and c ) parallel to x . This is the original orientation. Next, the initial Cartesian rotations, if any, are applied. Finally, the clinographic rotations, if selected, are applied. This is the initial orientation.

The initial orientation might also be termed the "preferred" orientation, since this is the one orientation which can be saved, and returned to with the Save/Recover Orientation command in the Rotate menu.