There is no command for advancing trajectory frames. Perhaps you can detail the scenario that you need this for and why the per-frame scripting of the MD Movie tool doesn't cover your needs. Are you trying to completely automate the production of a movie from a trajectory or some such?
Yes.
Even if there were a command to advance the trajectory, how would you know when to stop? There are no "flow control" statements (if statements/for loops/functions) in the Chimera command language. I think you will have to use Python scripting for completely automating trajectory-related scripting. I can provide assistance there.
You are correct in your assessment--I don't know Python, but I do know Perl so I just wanted to use Perl to produce a line by line Chimera script that would do some zooms and rotations, writing POV files (actually x3d files that I'll translate into POV files in a later step), then flow straight into an MD movie, writing POV files for each frame. No worries--I'm sure I can figure out how to do a per-frame Python script that will write an x3d file with a unique name for each trajectory frame. It just made more sense to me the other way around. Thanks! Kristina -- Kristina Furse Postdoctoral Research Associate 262 Stepan Chemistry Hall Notre Dame, IN 46556 (574)631-3904