Molecule Tutorials - Herong's Tutorial Examples - v1.21, by Dr. Herong Yang
Difference of "turn" and "rotate" Commands
This section provides a quick introduction on the differences of 'turn' command and 'rotate' command in PyMol.
Both "turn" and "rotate" commands can be used to change the final visualization of the molecule structure. But they work differently:
"turn" Command - Changes the camera location by turning it about the x-axis, y-axis or z-axis in camera space. This command will change the rotation transformation matrix in viewing parameterts, and actually rotate the camera space.
Basically, the "turn" command is not changing atom locations in the model space. It is only changing the camera viwing direction to a new angle in the camera space.
The "turn" command is equivalent the rotate action with mouse buttons.
Examples of "turn" commands:
# turning camera 90 degrees about z-axis turn z, 90 # turning camera 45 degrees about y-axis turn y, 45
"rotate" Command - Changes atom locations by turning them about the x-axis, y-axis or z-axis in the model space. This command will not change any viewing parameters.
Since atom locations are changes, the molecule structure is technically changed by the "rotate" command.
Examples of "rotate" commands:
# rotating molecule atom locations 90 degrees about z-axis rotate z, 90 # toration molecule atom locations 45 degrees about y-axis rotate y, 45
Conclusion: don't use "rotate" command, if you don't want to modify the molecule object. Use "turn" command only.
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