There's a feature in my SEQCROW plugin that might do what you want. In the settings (Favorite/Preferences -> Settings... -> SEQCROW), you can define commands to run when a model is opened. It's not advanced enough to cycle through different colors for different models, though.

From: ChimeraX-users <chimerax-users-bounces@cgl.ucsf.edu> on behalf of Niels Bradshaw via ChimeraX-users <chimerax-users@cgl.ucsf.edu>
Sent: Sunday, February 20, 2022 12:03 PM
To: chimerax-users@cgl.ucsf.edu <chimerax-users@cgl.ucsf.edu>
Subject: [chimerax-users] Editing preset for initial colors

[EXTERNAL SENDER - PROCEED CAUTIOUSLY]

Hi Elaine,

Is there a way in chimera X to change the initial colors preset for new models?

I’m not into the default tan color, so I end up changing the color immediately every time I open a new model.

In previous versions of Chimera, I had disabled color by model and set all new models to open with grey. In pymol, I defined the colors for the first 10 models I open in the startup script, which is even more convenient. Having the option to have the default to color by chain could also be nice if that is possible. I tried some workarounds like redefining the tan color, but it appears that is not allowed.

Thanks,
Niels
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