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diff --git a/intern/moto/include/MT_Plane3.h b/intern/moto/include/MT_Plane3.h
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+/**
+ * $Id$
+ * ***** BEGIN GPL/BL DUAL LICENSE BLOCK *****
+ *
+ * This program 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 Blender
+ * Foundation also sells licenses for use in proprietary software under
+ * the Blender License.  See http://www.blender.org/BL/ for information
+ * about this.
+ *
+ * This program 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 this program; if not, write to the Free Software Foundation,
+ * Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ *
+ * The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
+ * All rights reserved.
+ *
+ * The Original Code is: all of this file.
+ *
+ * Contributor(s): none yet.
+ *
+ * ***** END GPL/BL DUAL LICENSE BLOCK *****
+ */
+
+#ifndef MT_PLANE3
+
+#define MT_PLANE3
+
+#include "MT_Tuple4.h"
+#include "MT_Point3.h"
+
+/**
+ * A simple 3d plane class.
+ *
+ * This class represents a plane in 3d. The internal parameterization used
+ * is n.x + d =0 where n is a unit vector and d is a scalar.
+ *
+ * It inherits data from MT_Tuple4 please see this class for low level
+ * access to the internal representation.
+ * 
+ */
+
+class MT_Plane3 : public MT_Tuple4
+{
+public :
+	/**
+	 * Constructor from 3 points
+	 */
+
+	MT_Plane3(
+		const MT_Vector3 &a,
+		const MT_Vector3 &b,
+		const MT_Vector3 &c
+	);
+	/**
+	 * Construction from vector and a point.
+	 */
+
+	MT_Plane3(
+		const MT_Vector3 &n,
+		const MT_Vector3 &p
+	);
+
+	/**
+	 * Default constructor
+	 */
+	MT_Plane3(
+	);
+
+	/**
+	 * Default constructor
+	 */
+
+	MT_Plane3(
+		const MT_Plane3 & p
+	):
+		MT_Tuple4(p)
+	{
+	}
+
+	/**
+	 * Return plane normal
+	 */
+	
+		MT_Vector3
+	Normal(
+	) const;
+
+	/**
+	 * Return plane scalar i.e the d from n.x + d = 0
+	 */
+
+		MT_Scalar
+	Scalar(
+	) const ; 
+
+	/**
+	 * Invert the plane - just swaps direction of normal.
+	 */
+		void
+	Invert(
+	);
+	
+	/**
+	 * Assignment operator
+	 */
+
+		MT_Plane3 &
+	operator = (
+		const MT_Plane3 & rhs
+	);
+
+	/**
+	 * Return the signed perpendicular distance from a point to the plane
+	 */
+
+		MT_Scalar
+	signedDistance(
+		const MT_Vector3 &
+	) const;
+		
+	
+};
+
+#ifdef GEN_INLINED
+#include "MT_Plane3.inl"
+#endif
+
+
+#endif
+
+