Molecule Tutorials - Herong's Tutorial Examples - v1.21, by Dr. Herong Yang
Virtual Trackball Rotation on PyMol
This section provides a quick introduction of Virtual Trackball Rotation model used by PyMol to rotate the molecule structure in 3-dimensions.
Once the molecule structure is displayed in the viewer window, you can rotate the molecule structure in 3-dimensions using the virtual trackball rotation model as described below.
1. The molecule structure is attached to a virtual trackball with the center of thr structure located at the center of the trackball.
2. The center of the trackball is fixed at the center of a 3-dimensional coordinate system on the screen with x-axis displayed horizontally, y-axis displayed vertically, and z-axis displayed purpendicular to the screen.
3. The trackball can be rotated by the left mouse button in 4 ways:
The following diagram (source: "Introduction to PyMOL" by DeLano Scientific LLC) shows you the virtual trackball rotation model used in PyMol:
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