PiperOrigin-RevId: 508330060 Change-Id: I16a5e70c5950178826a2a52a7a2005ef7f39ccfb
Using coordinate-free formula equivalent to linear finite elements. PiperOrigin-RevId: 491317615 Change-Id: I096b9a56075bbb630f64bfffac8a8d66457e5e2d