Function iso_curves 

pub fn iso_curves(
    model: &Model,
    face: &Shape,
    u_count: usize,
    v_count: usize,
    tol: Tolerances,
) -> OgeomResult<Vec<Vec<Point>>>

The isoparametric curves of a face: u_count at constant u, v_count at constant v, each trimmed to the stretches that lie on the face.

Evenly spaced across the face’s own parameter window, excluding its edges, because an isoparametric at the window’s edge is the face’s boundary and the boundary is already drawn.

Errors

OgeomError::Construction if the face carries no surface.