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. http://www.cgl.ucsf.edu/chimera/animations/animations.html 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. Tom -------- Original Message -------- Subject: Re: [Chimera-users] Nutate or lemniscate program to scenes/animation? From: Hurt, Darrell (NIH/NIAID) [E] To: Conrad Huang, chimera-users@cgl.ucsf.edu <chimera-users@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) OCICB/OSMO/OD/NIAID/NIH
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On 11/19/12 1:50 PM, "Conrad Huang" <conrad@cgl.ucsf.edu> wrote:
rock x 5 cycle 180 ; wait 45 ; rock y 5 cycle 180
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