Hi Oli,
There aren't "New Molecules" preferences (like Chimera has) in ChimeraX currently, sorry.  Maybe one of the programmers can advise on how to hard-wire it into the code.

For the non-programmers:

You can use "open" with "autoStyle false" to avoid the automatic styling of atomic structures, but then they just come up as white spheres.

Automatic styling rules:
<https://rbvi.ucsf.edu/chimerax/docs/user/autostyle.html>

You can make a custom preset but you would still need to choose it from the menu or apply it via command in a separate step.  So probably not any more convenient than making an alias and then using the alias.

Presets and user-defined presets:
<https://rbvi.ucsf.edu/chimerax/docs/user/menu.html#presets>
<https://rbvi.ucsf.edu/chimerax/docs/user/preferences.html#startup>

Aliases:
<https://rbvi.ucsf.edu/chimerax/docs/user/commands/alias.html>

Cheers,
Elaine
-----
Elaine C. Meng, Ph.D.                       
UCSF Chimera(X) team
Department of Pharmaceutical Chemistry
University of California, San Francisco

> On Sep 1, 2023, at 3:15 PM, Oliver Clarke via ChimeraX-users <chimerax-users@cgl.ucsf.edu> wrote:
>
> Hi,
>
> Is there anyway to set default preferences for molecule display? Currently it seems to vary (I think?) based on the number of atoms in the model - so relatively small proteins will load as ribbons, while larger ones will load in sphere representation.
>
> I would rather set a default such that all molecules load as ribbons, rainbow colored by chain. Is this possible?
>
> Cheers
> Oli


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