Michael, The "-c" option forces PyMOL to run in command-line-only mode which means it doesn't have access to the OpenGL hardware (used by cmd.draw and interactive graphics). In command-line-only mode, ray tracing (cmd.ray) is the only option.
Cheers, Warren > -----Original Message----- > From: pymol-users-boun...@lists.sourceforge.net > [mailto:pymol-users-boun...@lists.sourceforge.net] On Behalf > Of Michael Lerner > Sent: Thursday, October 25, 2007 8:31 AM > To: pymol mailinglist > Subject: [PyMOL] Trouble making pictures in a script > > Hi, > > I have a Python script that sets a system up and then calls > cmd.png() to render an image. I use it to process several > files at a time, and there's no need to look at it while it's > working, so I use > > pymol -qcr myscript.py > > to launch it. It works fine when I ray trace things, but if I > just set the system up and call cmd.png(), I get this error: > > ScenePNG-WARNING: invalid context or no image. > > Calling cmd.draw() instead of cmd.ray() doesn't seem to fix things. > Any ideas? Some of the systems are big enough that cmd.ray() > fails, so I'd like to be able to find a workaround. > > Thanks, > > -michael > > -- > Biophysics Graduate Student > Carlson Lab, University of Michigan > http://www.umich.edu/~mlerner > > -------------------------------------------------------------- > ----------- > This SF.net email is sponsored by: Splunk Inc. > Still grepping through log files to find problems? Stop. > Now Search log events and configuration files using AJAX and > a browser. > Download your FREE copy of Splunk now >> > http://get.splunk.com/ _______________________________________________ > PyMOL-users mailing list > PyMOL-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/pymol-users
