Hi all, I have just a couple of questions with regards to movie making in PyMol. Well, they are more niggling annoyances (holes in my knowledge?) which I can work around if needs be, but would rather not have to.
First up: Is there any way to tell PyMol *not* to change its view when loading a PDB file? For viewing in general, and for movies w/ morphs (etc.) in particular it would be nice to not have to re-set the view each time I load a new co-ordinate set. Secondly: Below is an example of a small hack I have written when making one particular movie. This one overlays two molecules related by a 2-fold axis by doing a simple rotation. > def overlay_chains(write_frames=0, ray=0): > # Now interpolate each point in the matrix > i = 1 > n = 45 > while i <= n: > # This is the only code I would imagine I should need: > # cmd.mdo( "%d" % (i), "rotate y,2,chain_a; rotate y,-2,chain_b" ) > # In the end I used the following cludge: > cmd.do( "rotate y,2,chain_a" ) > cmd.do( "rotate y,-2,chain_b" ) > if ( ray ): > cmd.do( "ray" ) > if ( write_frames ): > cmd.do( "png overlay_frames/overlay_%03d.png" % (i) ) > i = i+1 > cmd.extend( "overlay_chains", overlay_chains ) What is wrong with the cmd.mdo line above? The functionality I would expect would be that in each frame of the movie both chains are rotated 2 deg (in the relevant directions). What I get is that the change only occurs once per loop of the movie. That is to say that if I set up a movie using 'mset 1 -45' the positions only get updated once per 45 frames, not once per frame (which is what I would have expected). Thridly: Is there any command to tell PyMol to play a movie ONLY ONCE. This would be *really* useful if it has not yet been implemented. Fourth (and last): Is there a difference b/w the ray-tracing used by the standard 'ray' command and the 'mpng' command? I have noticed that if I take a still of a molecule, and then render the molecule rotating (for example) all within the one script I observe real differences b/w what should be identical frames. The clipping planes and the z camera distance move considerable. I can post code if that would help. Many thanks for info on any of the above stuff, Stephen -- Stephen Graham PhD Candidate Crystallography Group School of Molecular and Microbial Biosciences Building G08 University of Sydney Ph: +61 2 9351 6012 Fax: +61 2 9351 4726 ------------------------------------------------- This mail sent through IMP: www-mail.usyd.edu.au
