main/src/georegression/geometry/UtilPlane3D_F64.java
public static PlaneNormal3D_F64 convert( PlaneTangent3D_F64 input , PlaneNormal3D_F64 output ) {
		if( output == null )
			output = new PlaneNormal3D_F64();

		// the value of input is a vector normal to the plane and a point on the plane.
		output.n.x = input.x;
		output.n.y = input.y;
		output.n.z = input.z;

		output.p.set(input);

		return output;
	}
public static PlaneNormal3D_F64 convert( PlaneTangent3D_F64 input , PlaneNormal3D_F64 output ) {
		if( output == null )
			output = new PlaneNormal3D_F64();

		// the value of input is a vector normal to the plane and a point on the plane.
		output.n.x = input.x;
		output.n.y = input.y;
		output.n.z = input.z;

		output.p.set(input);

		return output;
	}
Converts a plane in tangent form into a plane in normal form

@param input Plane in tangent form.
@param output (Optional) Storage for output plane in normal form. If null a new instance will be declared.
@return The convert plane in general form.