Read chapter 4 [[https://storion.ru/books/Sholl09book.pdf| here]] and  [[https://storion.ru/books/Sun2013_surface_slabs.pdf| this paper]].

See [[http://nbviewer.jupyter.org/github/dimonaks/siman/blob/simanaks/tutorials/geo_point_surf/surface.ipynb| this]] and [[https://nbviewer.org/github/dimonaks/siman/blob/simanaks/tutorials/surfaces.ipynb| this]] Siman Tutorials