//===========================================================================//
// File:	normal.cc                                                           //
// Project: MUNGA           Brick: Math Library                              //
// Contents: Implementation details for the normal class                     //
//---------------------------------------------------------------------------//
//   Date    Who  Modification                                               //
// --------  ---  ---------------------------------------------------------- //
// 11/19/94  JMA  Initial coding.                                            //
//---------------------------------------------------------------------------//
// Copyright (C) 1994-1995, Virtual World Entertainment, Inc.                //
// All Rights reserved worldwide                                             //
// This unpublished sourcecode is PROPRIETARY and CONFIDENTIAL               //
//===========================================================================//

#include <munga.hpp>
#pragma hdrstop

#if !defined(NORMAL_HPP)
	#include <normal.hpp>
#endif

#if !defined(AFFNMTRX_HPP)
	#include <affnmtrx.hpp>
#endif

//
//#############################################################################
//#############################################################################
//
Normal&
	Normal::Multiply_Inverse(
		const Normal &Source,
		const AffineMatrix &M
	)
{
	Check(this);
	Check(&Source);
	Check(&M);

	x = Source.x*M(0,0) + Source.y*M(0,1) + Source.z*M(0,2);
	y = Source.x*M(1,0) + Source.y*M(1,1) + Source.z*M(1,2);
	z = Source.x*M(2,0) + Source.y*M(2,1) + Source.z*M(2,2);

	return *this;
}

//
//#############################################################################
//#############################################################################
//
Normal&
	Normal::Multiply(
		const Normal &Source,
		const AffineMatrix &M
	)
{
	Check(this);
	Check(&Source);
	Check(&M);

	AffineMatrix m;
	m.Invert(M);
	return Multiply_Inverse(Source,m);
}

#if defined(TEST_CLASS)
#	include "normal.tcp"
#endif