pub fn chain_tangent(chain: &Chain2, s: Scalar) -> GeomResult<Vec2>Expand description
Unit tangent of a chain at arc length s (unit when the start frame is
orthonormal; a skewed frame maps it as it maps an intrinsic curve’s).
pub fn chain_tangent(chain: &Chain2, s: Scalar) -> GeomResult<Vec2>Unit tangent of a chain at arc length s (unit when the start frame is
orthonormal; a skewed frame maps it as it maps an intrinsic curve’s).