Function winding_number_along

pub fn winding_number_along(
    mesh: &TriMesh,
    point: Point3,
    direction: Vec3,
) -> Option<i32>

Winding number along a caller-chosen ray direction.

Exposed so a caller that hit a None tie can retry along another ray instead of giving up. Any direction gives the same answer when it hits no degeneracy, which is exactly what the retry relies on.