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Hi Chao,
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<div>I have a same need as you and I used Pymol to do it if you would like to try.</div>
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<div><a href="https://pymolwiki.org/index.php/Cartoon_cylindrical_helices">https://pymolwiki.org/index.php/Cartoon_cylindrical_helices</a></div>
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<div>Hong<br>
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<div dir="ltr">Sent from my iPhone</div>
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<blockquote type="cite">On Aug 28, 2022, at 11:20 AM, Elaine Meng via ChimeraX-users <chimerax-users@cgl.ucsf.edu> wrote:<br>
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<div dir="ltr"><span>Hi Chao,</span><br>
<span>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.
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<span><https://www.rbvi.ucsf.edu/trac/ChimeraX/ticket/1242></span><br>
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<span>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.</span><br>
<span><https://rbvi.ucsf.edu/chimerax/docs/user/tools/axesplanes.html></span><br>
<span><https://rbvi.ucsf.edu/chimerax/docs/user/commands/define.html></span><br>
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<span>I hope this helps,</span><br>
<span>Elaine</span><br>
<span>-----</span><br>
<span>Elaine C. Meng, Ph.D. </span><br>
<span>UCSF Chimera(X) team</span><br>
<span>Department of Pharmaceutical Chemistry</span><br>
<span>University of California, San Francisco</span><br>
<span></span><br>
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<blockquote type="cite"><span>On Aug 26, 2022, at 7:47 PM, 王超(Chao Wang) via ChimeraX-users <chimerax-users@cgl.ucsf.edu> wrote:</span><br>
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<blockquote type="cite"><span>Dear All,</span><br>
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<blockquote type="cite"><span>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?</span><br>
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<blockquote type="cite"><span><2D08A285@47B9C47A.AA850963></span><br>
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<blockquote type="cite"><span>Thanks,</span><br>
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<blockquote type="cite"><span>Chao.</span><br>
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