Hi Chao,

I have a same need as you and I used Pymol to do it if you would like to try.

https://pymolwiki.org/index.php/Cartoon_cylindrical_helices

Hong

Sent from my iPhone

On Aug 28, 2022, at 11:20 AM, Elaine Meng via ChimeraX-users chimerax-users@cgl.ucsf.edu wrote:

Hi Chao, Sorry, currently there is no option to make cartoon tube helices straight. There is a request already in our ticket database, but I do not know if the feature will be added or not. https://www.rbvi.ucsf.edu/trac/ChimeraX/ticket/1242

If you don't mind just having a separate cylinder display for each helix that is not connected into the cartoon, then try Axes/Planes/Centroids tool and/or "define axis" command. The tool is very new (not in ChimeraX version 1.4) so you would need to download a new daily build to use it. https://rbvi.ucsf.edu/chimerax/docs/user/tools/axesplanes.html https://rbvi.ucsf.edu/chimerax/docs/user/commands/define.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 Aug 26, 2022, at 7:47 PM, 王超(Chao Wang) via ChimeraX-users chimerax-users@cgl.ucsf.edu wrote:

Dear All, After displaying helix in cylinder mode, I found that it is curved by default. I would like to ask whether it can be changed to a straight shape with two ends as fulcrums or other straight way? 2D08A285@47B9C47A.AA850963 Thanks, Chao.

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