Molecule Tutorials - Herong's Tutorial Examples - 1.01, by Dr. Herong Yang
"until.mroll()" - Movie Rolling Function
This section provides a tutorial on how to generate 'mdo' commands to turn the camera continuousely over a large number of frames using the 'util.mroll()' function in PyMol.
If you want to keep rolling the camera in a large number of frames, and tired of using the "mdo" command, you can use the "util.mroll()" function to generate "mdo" command automatically.
util.mroll(start_frame, end_frame, loop-flag) - Generates "mdo" commands, one for each frame in the given frame range. Those "mdo" commands will turn the camera 360 degree about the y-axis with equal angles.
The following PyMol command script will play 3 objects for 9 seconds. Each object will displayed and rotated for 3 seconds:
# Build-Rolling-Camera-Movie.pml delete all reset set all_states, off set static_singletons, off set movie_auto_interpolate, off set movie_loop, off set movie_fps, 30 load Molecule-Methane.sdf, Methane, 1 load Molecule-Alcohol.sdf, Alcohol, 2 load Benzene-Ring.sdf, Benzene, 3 # define a movie for 9 seconds (270 frames) with each object for 3 seconds mset 1 x90 2 x90 3 x90 # generates mdo command to turn 360 degrees about x-axis in frames (60, 90) # not sure what is the 3rd argument is for... util.mroll(30, 60, 1) util.mroll(120, 150, 1) util.mroll(210, 240, 1) mplay
If you want to see what "mdo" commands are generated by the util.mroll() function, run the "mdump" command:
PyMOL>mdump Movie: General Purpose Commands: 30: turn y, 11.613 31: turn y, 11.613 32: turn y, 11.613 33: turn y, 11.613 34: turn y, 11.613 35: turn y, 11.613 36: turn y, 11.613 ...
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