Assertion: curve | /r/MadeOf | surface normal u
Facets:
Source sentences:
text: The normal curvature, k n , is the curvature of the curve projected onto the plane containing the curve's tangent T and the surface normal u; the geodesic curvature, k g , is the curvature of the curve projected onto the surface's tangent plane; and the geodesic torsion (or relative torsion), τ r , measures the rate of change of the surface normal around the curve's tangent.