Hello ChuHui, There is an option in “Define axes…” to create “Plane normals,” that is, an axis orthogonal to a plane. <http://www.rbvi.ucsf.edu/chimera/docs/ContributedSoftware/structuremeas/structuremeas.html#axes> It can also be done with the “define axis” command: <http://www.rbvi.ucsf.edu/chimera/docs/UsersGuide/midas/define.html#axis> However, there is no option to define a plane from another object (plane, axis, or centroid), sorry. Planes can only be defined from sets of atoms or markers. Maybe interesting: you can show the inertia ellipsoid for a set of atoms using command “measure inertia”… the ellipsoid shows the principal axes in 3D: <http://www.rbvi.ucsf.edu/chimera/docs/UsersGuide/midas/measure.html#inertia> ----- Elaine C. Meng, Ph.D. UCSF Chimera(X) team Department of Pharmaceutical Chemistry University of California, San Francisco
On Jun 7, 2018, at 7:47 AM, ChuHui Fu <cfu@haverford.edu> wrote:
Hello, I am trying to define planes and axes that are orthogonal to the planes and axes that I have previously defined. I have an alpha helix, and I only managed to define one plane and two orthogonal axes around the helix. Is it possible to define the rest of the axes and planes? Thanks!