[Chimera-users] morph-coordinates and camera movements

[Eric Pettersen]

On Oct 30, 2008, at 3:34 PM, Matthew Dougherty wrote:

> I was generating a morph of atoms and wanted to rotate the camera 242
> degrees on the x axis.
>
> I am thinking there may be several ways to do this, such as per-frame
> script in the morph tool or through the movie recorder script.
>
> Is one way better than the other?
>
> What would the scripts look like?

Hi Matt,
	You can't actually use a movie-recorder script for this because (and  
we were discussing this just this afternoon!) there is no command that  
will get a trajectory/morph to play.  The two ways I can think of to  
get what you want is to use the per-frame script capabilities of the  
MD Movie tool that you mentioned, or to use the newish "perframe"  
command to get things to happen as each frame is drawn.  In your  
scenario I can't of any compelling reason to use the latter, so I'll  
just describe the former.
	I think you just want to use the "turn" command, with the angle being  
242 divided by the number of frames in your morph trajectory.  Let's  
say you have 121 frames, your turn command would be "turn x 2.0" and  
you would type that into the per-frame scripting dialog and click  
"OK".  That would apply it to the current frame, so you might want to  
type "turn x -2.0" in the command line to get back to your starting  
position (or you might not).  Anyway, I think using the scripting  
dialog is pretty well illustrated in this PDF: http://www.cgl.ucsf.edu/chimera/docs/ProgrammersGuide/md-mav.pdf
	Let me know if you have trouble.

--Eric


                         Eric Pettersen
                         UCSF Computer Graphics Lab
                         http://www.cgl.ucsf.edu

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