function pointInsideTriangle(point, p0, p1, p2) {
  const coords = barycentricCoordinates(
    point,
    p0,
    p1,
    p2,
    scratchBarycentricCoords,
  );
  if (!defined(coords)) {
    return false;
  }
  return coords.x > 0.0 && coords.y > 0.0 && coords.z > 0;
}
Determines if a point is inside a triangle.

@function pointInsideTriangle

@param {Cartesian2|Cartesian3} point The point to test.
@param {Cartesian2|Cartesian3} p0 The first point of the triangle.
@param {Cartesian2|Cartesian3} p1 The second point of the triangle.
@param {Cartesian2|Cartesian3} p2 The third point of the triangle.
@returns {boolean} <code>true</code> if the point is inside the triangle; otherwise, <code>false</code>.

@example
// Returns true
const p = new Cesium.Cartesian2(0.25, 0.25);
const b = Cesium.pointInsideTriangle(p,
  new Cesium.Cartesian2(0.0, 0.0),
  new Cesium.Cartesian2(1.0, 0.0),
  new Cesium.Cartesian2(0.0, 1.0));