Hi Jianhao, It depends what you mean by relative position. If you mean distance, one way would be to place a marker at the map center and then measure distance between it and the marker you already have. You can place a marker at map center with "measure center" and the "mark true" option: <https://rbvi.ucsf.edu/chimerax/docs/user/commands/measure.html#center> ....or at specific coordinates such as 0,0,0 with "marker" and the "position" keyword to specify a point: <https://rbvi.ucsf.edu/chimerax/docs/user/commands/marker.html#create> Then you can select the two markers (same as atoms) with Ctrl-click, Shift-Ctrl-click and then use command "distance sel": <https://rbvi.ucsf.edu/chimerax/docs/user/commands/distance.html> Or regardless of whether you wanted to measure any distances, you can save the marker(s) to file and just look at the file with a text-editor to see what its coordinates are: <https://rbvi.ucsf.edu/chimerax/docs/user/markers.html> I hope this helps, Elaine ----- Elaine C. Meng, Ph.D. UCSF Chimera(X) team Department of Pharmaceutical Chemistry University of California, San Francisco
On May 25, 2022, at 7:54 AM, C.J. via ChimeraX-users <chimerax-users@cgl.ucsf.edu> wrote:
Hi, I place a marker in a cryoEM map with "Volume Tracer" tool. How can I know the relative position of the marker to the origin or center of the map? Thank you! Best, Jianhao