That is odd, I didn’t know the helix cylinder diameters varied in ChimeraX. I don’t know the algorithm or how to change the diameter. Maybe Conrad (who wrote the code) or Elaine will know. There is a chimerax-users@cgl.ucsf.edu mailing list that you can ask such questions on.

On Apr 3, 2017, at 10:40 AM, Martin Moncrieffe wrote:

Hi Tom,

When displaying helices as tubes, can one set the radius of the tubes? I’ve noticed that depending on the structure, the tube diameter is scaled scaled differently even though the docs state that w/h/x-secton do not apply in tube mode. I’m sure you guys have some fancy algorithm to do so.

Anyway, I really like what you’re all doing so far.

Best.

__martin