I have been playing with the icosahedron utility in Chimera. I really like this feature, especially with the sphere factor.

The current routine uses a subdivision factor to represent the number of triangles on an icosahedral surface. However this lattice is not the same as we see in icosahedral viruses, which use a T number to designate symmetry. With a subdivision number, there are always hexamers on any edge of the icosahedron, whereas in the virus structure this is not the case.

I am wondering if Chimera has an utility that can use the T number as the basis for building an icosahedron surface.

Thank you.

Hope everything is going well and stay safe!

Wei