[Chimera-users] Nutate or lemniscate program to scenes/animation?

Tom Goddard goddard at sonic.net
Mon Nov 19 15:58:39 PST 2012

Hi Darrell,

   I added a precession option to the Chimera turn and roll commands 
that I believe performs the motion you are looking for. I added an 
example called "wobble motion" in the Chimera animation gallery.


The new option specifies the angle between the rotation axis and the 
precessing axis, for example,

     roll precess 20

Conrad will add an action to the Chimera Animation dialog to incorporate 
the motion in animations.


-------- Original Message --------
Subject: Re: [Chimera-users] Nutate or lemniscate program to 
From: Hurt, Darrell (NIH/NIAID) [E]
To: Conrad Huang, chimera-users at cgl.ucsf.edu <chimera-users at cgl.ucsf.edu>
Date: 11/19/12 11:30 AM
> Hi Conrad,
> This motion is very similar to what I was imagining, but it is not
> precisely there. Although the object wobbles, what I see is a precession
> about the Z axis. It takes 4 cycles of this motion to return a given point
> to its starting position. A true nutation would return a given point to
> its starting position after one cycle.
> The difference can be seen in these two contrasting Wikipedia entries:
> http://en.wikipedia.org/wiki/Precession
> http://en.wikipedia.org/wiki/Nutating_disc_engine
> Thanks for helping me!
> Darrell
> Darrell Hurt, Ph.D.
> Section Head, Computational Biology
> Bioinformatics and Computational Biosciences Branch (BCBB)
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> On 11/19/12 1:50 PM, "Conrad Huang" <conrad at cgl.ucsf.edu> wrote:
>> rock x 5 cycle 180 ; wait 45 ; rock y 5 cycle 180
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