Quad constructor
      
      Quad()
     
    
Create a new, uninitialized quad.
Implementation
Quad()
    : _point0 = Vector3.zero(),
      _point1 = Vector3.zero(),
      _point2 = Vector3.zero(),
      _point3 = Vector3.zero();Create a new, uninitialized quad.
Quad()
    : _point0 = Vector3.zero(),
      _point1 = Vector3.zero(),
      _point2 = Vector3.zero(),
      _point3 = Vector3.zero();