Quad.points constructor
Create a quad by four points.
Implementation
Quad.points(Vector3 point0, Vector3 point1, Vector3 point2, Vector3 point3)
: _point0 = Vector3.copy(point0),
_point1 = Vector3.copy(point1),
_point2 = Vector3.copy(point2),
_point3 = Vector3.copy(point3);