VMD-L Mailing List

From: Justin Gullingsrud (justin_at_ks.uiuc.edu)
Date: Tue Apr 13 1999 - 13:37:00 CDT

Charles,

One of the original developers would have to answer you with regard
to the intent of this feature, but as far as getting the behavior
you want, you can just move one or more of the molecules using the
Pick Item Mode -> MoveMolecule popup menu off the right mouse button.
After you move the molecules, they will still rotate about the same
axis. But you are right that if you fix, translate, and then unfix,
the axes are different. Guessing which one does which might not have
been intuitively obvious, but now you know how to do both.

Thanks for using VMD!

Justin Gullingsrud
justin_at_ks.uiuc.edu

>
> Hello again,
>
> I hope I didn't miss this one on the list somewhere...
>
> With two molecules I do the following:
>
> -fix #1
> -translate #2
> -unfix #1
> -rotate both together
>
> Because the translate operation does not modify either molecule's
> center transformation, the molecules now rotate about different
> axes. This behavior is not what I was expecting, and I'm having
> difficulty finding a justification for it.
>
> My questions are: is this behavior intended? Why?
>
> I think I can hack back to the behavior I want (molecules rotating
> about a single axis), but I wonder what I'm missing.
>
> Thanks,
> Charles
>
> --
> Charles Schwieters email: Charles.Schwieters_at_nih.gov
> www: http://www.hec.utah.edu/~schwitrs
> phone: (301) 402-4914 FAX: (301) 402-2867