Re: [PyMOL] Command:turn

JP,

> According to the manual, it is also supposed to be 
> constrained to the origin as well but doesn't appear to do 
> so, at least not in my hands Are its constraints possibly 
> overridden by such commands as center, orient, origin?

origin position=[0,0,0]
turn axis,angle

can change the origin, but x,y,z are always in the camera frame of reference
with the turn and move commmands.

> Reason for asking this is that it would be very nice (at 
> least for me) to be able to perform "local" transformations 
> (i.e. about local object axes, be it the camera or other) 
> that are bound to locally-defined axes
> - that are independent of the "global" or viewport orientation.

For this, use the rotate command.

# atomic coordinate based (geometry must be recomputed)

rotate x,90,

# object matrix based (geometry remains valid, but causes other problems)

rotate x,90,object=object-name

Note that the optional "camera" option (0,1) can control whether global or
camera frame of reference applies, and that the current global origin is
always the center.

origin object-name-or-selection

to change it

Don't mix the two types of rotations or PyMOL will get confused.

Cheers,
Warren

> -----Original Message-----
> From: pym...@li... 
> [mailto:pym...@li...] On Behalf 
> Of Cartailler, Jean-Philippe
> Sent: Tuesday, January 23, 2007 1:19 PM
> To: pym...@li...
> Subject: [PyMOL] Command:turn
> 
> Greetings,
> 
> Does anyone know if the camera commands (turn & move) can be 
> constrained to the reference (global) axes?  I would imagine 
> that the turn command
> (http://pymol.sourceforge.net/newman/ref/S1000comref.html#2_16
> 6) would cause a camera of 45 degrees about the reference axis:
> 
> PyMOL> turn x, 45
> 
> However, it appears to turn the camera about the viewport 
> "orientation", i.e. about the (horizonal) x-axis axis of the 
> viewport.  Note - this is pretty clear if you use Robert 
> Campbell's axes_cyl.py to visualize the reference axis.
> 
> According to the manual, it is also supposed to be 
> constrained to the origin as well but doesn't appear to do 
> so, at least not in my hands Are its constraints possibly 
> overridden by such commands as center, orient, origin?
> 
> Reason for asking this is that it would be very nice (at 
> least for me) to be able to perform "local" transformations 
> (i.e. about local object axes, be it the camera or other) 
> that are bound to locally-defined axes
> - that are independent of the "global" or viewport orientation.
> 
> Using winXP/Pymol 0.98.
> 
> Thanks!
> 
> JP Cartailler
> 
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