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 31 Center Drive, Room 3B62B, MSC 2135 Bethesda, MD 20892-2135 Office 301-402-0095 Mobile 301-758-3559 http://bioinformatics.niaid.nih.gov (Within NIH) http://exon.niaid.nih.gov (Public) Disclaimer: The information in this e-mail and any of its attachments is confidential and may contain sensitive information. It should not be used by anyone who is not the original intended recipient. If you have received this e-mail in error please inform the sender and delete it from your mailbox or any other storage devices. National Institute of Allergy and Infectious Diseases shall not accept liability for any statements made that are sender's own and not expressly made on behalf of the NIAID by one of its representatives. 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