Hi everyone, I have a question for the python experts: Suppose I have opened an MD trajectory using MD movie. I want a script that will capture images along the trajectory spaced by user-defined timespans. Problem is, I don't know how to use a script to go to a specific frame in MD movie. As I understand it, coordset, as employed in the following example, requires the user to first play through the entire trajectory. With a million frames, that's not practical. Here's what I have so far, cobbled together from examples and my own limited understanding of Python. ---------------------------- from chimera import runCommand timestep=input ("How many picoseconds pass between frames?") spacing=input ("What spacing, in ps, do you want between structures?") start=input ("Which frame do you want to start with?") end=input ("What frame do you want to end with?") runCommand("coordset #0" + start) runCommand("focus") runCommand("copy file C:\Users\Dan\Desktop" + "\\" +start + ".png" + " width 2000 width 2000 supersample 3") ---------------------------- So in place of coordest, what could I use to jump to frames within MD movie? And while I'm at it, How can I generically specify the desktop in a windows environment (so that I could give this to a student and they wouldn't have to change "Dan" in c:\users\Dan\Desktp") How can I change the filename for the image to reflect framenumber? Thanks as always for your help. Dan -- ____________________________ Daniel Gurnon, Ph. D. Associate Professor of Chemistry and Biochemistry DePauw University Greencastle, IN 46135 p: 765-658-6279 e: danielgurnon@depauw.edu