I'd say "https://letmegooglethat.com/?q=chimerax+distance" but the
resulting links don't work for me.  But using google.com directly does. 
The top two links are ChimeraX's distance command and the Distances
tool.  So
https://www.cgl.ucsf.edu/chimerax/docs/user/commands/distance.html and
https://www.cgl.ucsf.edu/chimerax/docs/user/tools/distances.html. Using
the Distances tool might be the easiest way to start.  If you click on
Create, it tells you to select two atoms.  So do that and then click on
Create.  You will see the corresponding distance command, that you could
type in, shown in the Log.  The documentation gives several other ways
to show distances.  I recommend learning to read the documentation :-).
   An aside, you can toggle whether the links in the Log take you to the
documentation for the command or repeat the command, by right-mouse
clicking on the Log and selecting Executable Command LInks.

     HTH,

     Greg

On 3/17/2024 2:57 PM, Enrico Martinez via ChimeraX-users wrote:
> Dear ChimeraX users !
>
> I need to draw several distance vectors on the 3D structure. Could you
> provide me with an example of the commands that could automatically
> draw the distances between two selected atoms with some basic labels
> on it ?
>
> Many thanks in advance
>
> Enrico
>
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