Function faces_same_direction 

pub fn faces_same_direction(polygon: &Polygon, plane: &Plane3D) -> bool

Determines if a polygon faces the same direction as a plane.

Compares the polygon’s normal to the plane’s normal using the dot product. Returns true if the normals point in roughly the same direction (dot > 0).

Panics

Panics if the polygon has a degenerate (zero-length) normal.