PiperOrigin-RevId: 491340247 Change-Id: If559d60371ad604b94b92efd01ed6de9ecf6f2b0
Using coordinate-free formula equivalent to linear finite elements. PiperOrigin-RevId: 491317615 Change-Id: I096b9a56075bbb630f64bfffac8a8d66457e5e2d