public static bool Contains(Vector3 v0, Vector3 v1, Vector3 v2, Vector3 p)
{
var bc = Barycenter(v0, v1, v2, p);
return(
Mathx.IsEqual(bc.x + bc.y + bc.z, 1.0f) &&
Mathx.IsInRange(bc, Vector3.zero, Vector3.one)
);
}