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diff --git a/src/3dengfx/src/n3dmath2/n3dmath2_qua.hpp b/src/3dengfx/src/n3dmath2/n3dmath2_qua.hpp
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+/*
+This file is part of the n3dmath2 library.
+
+Copyright (c) 2003 - 2005 John Tsiombikas <nuclear@siggraph.org>
+
+The n3dmath2 library is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
+The n3dmath2 library is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with the n3dmath2 library; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+*/
+
+/* quaterinion math
+ *
+ * Author: John Tsiombikas 2003
+ * Modified: John Tsiombikas 2004, 2005
+ */
+
+#ifndef _N3DMATH2_QUA_HPP_
+#define _N3DMATH2_QUA_HPP_
+
+#include <iostream>
+#include "n3dmath2_types.hpp"
+
+class Quaternion {
+public:
+	scalar_t s;
+	Vector3 v;
+
+	Quaternion();
+	Quaternion(scalar_t s, const Vector3 &v);
+	Quaternion(scalar_t s, scalar_t x, scalar_t y, scalar_t z);
+	Quaternion(const Vector3 &axis, scalar_t angle);
+
+	Quaternion operator +(const Quaternion &quat) const;
+	Quaternion operator -(const Quaternion &quat) const;
+	Quaternion operator -() const;
+	Quaternion operator *(const Quaternion &quat) const;
+	
+	void operator +=(const Quaternion &quat);
+	void operator -=(const Quaternion &quat);
+	void operator *=(const Quaternion &quat);
+
+	void reset_identity();
+
+	Quaternion conjugate() const;
+
+	scalar_t length() const;
+	scalar_t length_sq() const;
+	
+	void normalize();
+	Quaternion normalized() const;
+
+	Quaternion inverse() const;
+
+	void set_rotation(const Vector3 &axis, scalar_t angle);
+	void rotate(const Vector3 &axis, scalar_t angle);
+	/* note: this is a totally different operation from the above
+	 * this treats the quaternion as signifying direction and rotates
+	 * it by a rotation quaternion by rot * q * rot'
+	 */
+	void rotate(const Quaternion &q);
+
+	Matrix3x3 get_rotation_matrix() const;
+	
+	friend Quaternion slerp(const Quaternion &q1, const Quaternion &q2, scalar_t t);
+	
+	friend std::ostream &operator <<(std::ostream &out, const Quaternion &q);
+};
+
+
+#endif	// _N3DMATH2_QUA_HPP_