pub fn chart_poles(
surface: &SurfaceGeometry,
tol: Tolerances,
) -> Vec<(usize, f64, Point)>Expand description
The poles of a surface’s chart: each bound of a direction that does not
repeat along which the surface collapses to a point (a sphere’s pole, a
patch’s collapsed side), as the unknown that holds it (0 for u, 1 for
v), the bound, and the point.