[PyMOL] Distance measure between pseudo atoms does not update over states

[Istvan K. <iko...@gm...>]

Hi,

I have a simulation trajectory loaded in Pymol and I want to display
certain interatomic distances interactively. This works perfectly fine with
normal atoms, I can see how these selected distances change over the course
of the simulation using the wizard and playing the movie. However, it seems
that this feature doesn't work with pseudo atoms. I defined a couple of
center-of-mass pseudo atoms using this script
http://www.pymolwiki.org/index.php/center_of_mass. The script creates
separate objects corresponding to the different COMs and each COM object
has the same number of states as the trajectory object. I can use the
wizard, select the distances, which show on the display, but when I play
the movie, the distance values are not updated while the pseudo atoms do
move around. The first thing I figured was that maybe the COM objects
should be merged in a single object. So, I did that but to no avail, the
distances are not updated while I play the movie. I must be overlooking
something, can you tell me why this is not working?

Thank you very much,

   Istvan