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diff --git a/tool_src/BspLib/Transform2.h b/tool_src/BspLib/Transform2.h
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+//-----------------------------------------------------------------------------
+//	BSPLIB HEADER: Transform2.h
+//
+//  Copyright (c) 1997-1998 by Markus Hadwiger
+//  All Rights Reserved.
+//-----------------------------------------------------------------------------
+
+#ifndef _TRANSFORM2_H_
+#define _TRANSFORM2_H_
+
+// bsplib header files
+#include "BspLibDefs.h"
+#include "Vertex.h"
+
+
+BSPLIB_NAMESPACE_BEGIN
+
+
+// general 2-D homogeneous transformation -------------------------------------
+//
+class Transform2 {
+
+	friend Transform2 operator *( const Transform2& trafo1, const Transform2& trafo2 );
+
+public:
+	Transform2();
+	Transform2( const float trafo[3][3] );
+	Transform2( const double trafo[3][3] );
+	~Transform2() { }
+
+	// transform single vector by current transformation
+	Vector2		TransformVector2( const Vector2& vec ) const;
+
+	double		Determinant();						// calc matrix's determinant
+	int			Inverse( Transform2& inverse );		// calc matrix's inverse
+
+	// concatenate two transformations (natural and reversed order)
+	Transform2&	Concat( const Transform2& cattrafo );
+	Transform2&	ConcatR( const Transform2& cattrafo );
+
+	// create elementary matrices
+	Transform2&	LoadIdentity();
+	Transform2&	LoadRotation( double angle );
+	Transform2&	LoadScale( double x, double y );
+	Transform2&	LoadTranslation( double x, double y );
+
+	// elementary transformations in natural order
+	Transform2&	Rotate( double angle );
+	Transform2&	Scale( double x, double y );
+	Transform2&	Translate( double x, double y );
+
+	// elementary transformations in reversed order
+	Transform2&	RotateR( double angle );
+	Transform2&	ScaleR( double x, double y );
+	Transform2&	TranslateR( double x, double y );
+
+	// fetch translation part (optionally set it null afterwards)
+	Vector2		FetchTranslation() const;
+	Vector2		ExtractTranslation();
+
+	// fetch pointer to matrix
+	double *	LinMatrixAccess() { return (double *) m_matrix; }
+
+private:
+	// 3x3 matrix for 2-D homogeneous transformation (row vectors!)
+	double	m_matrix[3][3];
+};
+
+// load identity matrix -------------------------------------------------------
+inline Transform2& Transform2::LoadIdentity()
+{
+	memset( m_matrix, 0, sizeof( m_matrix ) );
+
+	m_matrix[ 0 ][ 0 ] = 1.0;
+	m_matrix[ 1 ][ 1 ] = 1.0;
+	m_matrix[ 2 ][ 2 ] = 1.0;
+
+	return *this;
+}
+
+// construct a Transform2 -----------------------------------------------------
+inline Transform2::Transform2()
+{
+//	LoadIdentity();
+}
+
+// construct a Transform2 directly from 3x3 matrix ----------------------------
+inline Transform2::Transform2( const double trafo[3][3] )
+{
+	//CAVEAT:
+	// the outer dimension of the matrix is not enforced!!
+	// trafo is actually of type double(*)[3]
+	memcpy( m_matrix, trafo, sizeof( m_matrix ) );
+}
+
+// construct a Transform2 directly from 3x3 matrix ----------------------------
+inline Transform2::Transform2( const float trafo[3][3] )
+{
+	//CAVEAT:
+	// the outer dimension of the matrix is not enforced!!
+	// trafo is actually of type float(*)[3]
+	for ( int i = 0; i < 9; i++ )
+		((double *)m_matrix)[ i ] = (double) ((float *)trafo)[ i ];
+}
+
+
+BSPLIB_NAMESPACE_END
+
+
+#endif // _TRANSFORM2_H_
+