On Nov 5, 2023, at 11:08 PM, Tony Schaefer via ChimeraX-users <chimerax-users@cgl.ucsf.edu> wrote:

I forgot about perframe, but it's not ideal for viewing trajectories interactively. Lately I've been doing some AIMD myself, so I figured it would be worth it to expand on my previous script and eventually add it to seqcrow. The updated script is here: https://gist.github.com/ajs99778/640ccd2c7e15a8bbb39d5f650de00111 (note: this requires AaronTools, which is included with seqcrow).

Opening the script will add a command called "monitorBonds" to ChimeraX. Run the command and give either an atom or model selection (e.g. `monitorBonds #1` or `monitorBonds sel`). As before, any time the coordinates change, it will add or delete bonds as appropriate. It will also now draw metal coordinate bonds, and draw TS bonds when atoms are a bit too far to be bonded. You can also add `guess true` to the command, and it will limit the atoms it checks to those that have a different connectivity at the first and last frames of the trajectory. Limiting the atoms reduces lag.

There's also `tolerance` and `tsTolerance` options for adjusting when different bond types are drawn. These tolerances get added to the atoms' covalent radii, and help prevent connectivity from changing too frequently. I might tweak these parameters some more later.

Tony

On Fri, Nov 3, 2023 at 4:21 PM Michael Patzschke via ChimeraX-users <chimerax-users@cgl.ucsf.edu> wrote:

Dear colleagues,

I have a trajectory from an ab initio MD run. The output is in the form of concatenated .xyz information. I can open and visualise this in ChimeraX, but the bond topology is determined from the first step. As the simulation progresses, bonds are stretched and the broken bond in my example just gets drawn, although the distance of the involved atoms gets larger then 7 Å by the end of the simulation. Is there a way to use dynamic bonds in ChimeraX? By this I mean that the bonds are only drawn when the distance of the involved atoms is below a certain threshold.

I would appreciate any help in the matter.

Kind regards,
Michael Patzschke
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