As far as multiple molecular models go, the issues are

 -  What is the user hoping to accomplish? Is it important that the original
coordinate system be respected? Or it is more convenient that the molecules
be auto-centered on the screen?

The answer:  It depends on the user and the task they're performing.

There are many use cases where the relative coordinate systems of two or
more input structures needs to be respected in order to for the content to
make any sense.  And there are use cases where users would simply prefer
that all molecules just be centered on the screen.  Then there are use cases
where it's more helpful for them to be systematically displaced relative to
one another.  And finally, there are those use cases where you're applying
some systematic transform to align two or more molecules.

The bottom line is that, to be generally useful, Jmol needs to be to
flexible in the respect (separate camera/object matrices are critical).
Default behavior is a tough decision, but given Jmol target usage, centering
is probably okay.  So far, I am not aware of any program that supports all
of the above use cases with a fair amount of extra work.  Most of the
professional tools respect input coordinate systems whereas most of the
educational toys don't.  

As far as origins go.  There are two primary use cases:  (1) where the
origin is fixed [well changeable, but not moving the camera] (2) where the
origin moves with the camera.  PyMOL supports both, and Jmol probably should
too, since they have different constituencies.  #2 is easier for newbies, by
pro's prefer #1.

Is there an XY translation function in Jmol's user interface?  Also, is
there an mouse interface yet for controlling Z-axis slabbing?  These two
capabilities are critical for professional usage.

Cheers,
Warren
--
Warren L. DeLano, Ph.D.                     
Principal Scientist

. DeLano Scientific LLC  
. 400 Oyster Point Blvd., Suite 213           
. South San Francisco, CA 94080    
. Biz:(650)-872-0942  Tech:(650)-872-0834     
. Fax:(650)-872-0273  Cell:(650)-346-1154
. mailto:[EMAIL PROTECTED]      
 




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