An empty Plane constructor.

Constructs a plane from a point on the plane and a normal vector of the plane.

Constructs a plane from the coordinate form of the plane a*x + b*y + c*z = d.

Constructs a plane through three non-collinear points.

Constructs a plane from a point and two direction vectors.

Constructs a plane from the analytic form of the plane z=Ax+By+C