at 8.34p EDT on 2004 February 05 Thursday Miguel Howard said:

> The purpose of this memo is to start a discussion about an 'issue' with
> axis orientation.
> 
> I don't think it is that important for the biochemists, but I suspect it
> will be more important for the crystalographers.
> 

well, as one of the former, I'll add my $0.02.

I would much prefer a consistent and unambiguous axis orientation - that is,
either left or right handed.  it would be ideal if Jmol followed conventions
established in other software, as well (I don't know how most other software
behaves in this regard, but maybe others will).  but I also agree with your
approach because...

> In order to maintain compatibility with existing RasMol/Chime scripts, I
> felt compelled to switch the orientation of the JmolAxes to comply with
> RasMol/Chime.
> 
...I think this is a valuable feature.


> My proposal is to expose a command that would switch the entire system to
> right-handed ... both the axes orientation and the rotations.
> 
> Q: Does anyone actually care about this? (Noone ever sees these things, so
> maybe it doesn't really matter)
> 
A: it depends.  if I were to send a move command, then the command to switch
the axes orientation, then run the same move command... the result of the two
moves would be different, right?  which means that by using the proposed
command, I could mess up animation scripts imported from Chime.

but as long as the Chime behavior remains an option for now (not necessarily
the default, btw), I am in favor of such a command.  it can be set before a
Chime animation is imported.


> Q: Is right-handed good enough, or are there people/groups who want a
> left-handed system?
> 
A: I'm left-handed, so...

actually, no I don't care one way or the other.  :-)


> Q: Do people agree that the rotation commands should be consistent with
> the axes orientation? (right-hand implies counter-clockwise rotations)
> 
yes, this person does.


regards,

:tim

-- 
timothy driscoll
molvisions - molecular graphics & visualization
<http://www.molvisions.com/>
usa:north carolina:wake forest


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