Hi there, really enjoying using the great tools of SPHARM-PDM.
I just wanted to know how I could go about finding the 3 axes of the ellipsoid part of my shape in object space (not for alignment purposes, rather for some other downstream analysis). I have computed all of the coefficients using SPHARM-PDM (positive ‘m’ only, as I believe is the case for this package), but can’t find anywhere how I would then compute the ellipsoid axes from the l=1 coefficients. I’m thinking it must be possible, since each set of l=1 coefficients uniquely map to an ellipsoid shape. The eigenvectors of a matrix containing these coefficients seems intuitive, but I can’t find a formula in any of the papers I’ve searched through.
Thank you very much in advance.