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diff --git a/source/gameengine/Ketsji/KX_SG_NodeRelationships.h b/source/gameengine/Ketsji/KX_SG_NodeRelationships.h
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+/**
+ * @mainpage KX_SG_NodeRelationships   
+
+ * @section 
+ *
+ * This file provides common concrete implementations of 
+ * SG_ParentRelation used by the game engine. These are
+ * KX_SlowParentRelation a slow parent relationship.
+ * KX_NormalParentRelation a normal parent relationship where 
+ * orientation and position are inherited from the parent by
+ * the child.
+ * KX_VertexParentRelation only location information is 
+ * inherited by the child. 
+ *
+ * @see SG_ParentRelation for more information about this 
+ * interface	  
+ *
+ * $Id$
+ *
+ * ***** 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 *****
+ * 
+ */
+
+#include "SG_Spatial.h"
+#include "SG_ParentRelation.h"
+
+
+class KX_NormalParentRelation : public SG_ParentRelation
+{
+
+public :
+
+	/**
+	 * Allocate and construct a new KX_NormalParentRelation
+	 * on the heap.
+	 */
+
+	static 
+		KX_NormalParentRelation *
+	New(
+	);		
+
+	/** 
+	 * Method inherited from KX_ParentRelation
+	 */
+
+		void
+	UpdateChildCoordinates(
+		SG_Spatial * child,
+		const SG_Spatial * parent
+	);
+
+	/** 
+	 * Method inherited from KX_ParentRelation
+	 */
+	
+		SG_ParentRelation *
+	NewCopy(
+	);
+
+	~KX_NormalParentRelation(
+	);
+
+private :
+
+	KX_NormalParentRelation(
+	);
+
+};
+
+
+class KX_VertexParentRelation : public SG_ParentRelation
+{
+
+public :
+
+	/**
+	 * Allocate and construct a new KX_VertexParentRelation
+	 * on the heap.
+	 */
+
+	static 
+		KX_VertexParentRelation *
+	New(
+	);		
+
+	/** 
+	 * Method inherited from KX_ParentRelation
+	 */
+
+		void
+	UpdateChildCoordinates(
+		SG_Spatial * child,
+		const SG_Spatial * parent
+	);
+
+	/** 
+	 * Method inherited from KX_ParentRelation
+	 */
+	
+		SG_ParentRelation *
+	NewCopy(
+	);
+
+	~KX_VertexParentRelation(
+	);
+
+private :
+
+	KX_VertexParentRelation(
+	);
+
+};
+
+
+class KX_SlowParentRelation : public SG_ParentRelation
+{
+
+public :
+
+	/**
+	 * Allocate and construct a new KX_VertexParentRelation
+	 * on the heap.
+	 */
+
+	static 
+		KX_SlowParentRelation *
+	New(
+		MT_Scalar relaxation
+	);		
+
+	/** 
+	 * Method inherited from KX_ParentRelation
+	 */
+
+		void
+	UpdateChildCoordinates(
+		SG_Spatial * child,
+		const SG_Spatial * parent
+	);
+
+	/** 
+	 * Method inherited from KX_ParentRelation
+	 */
+	
+		SG_ParentRelation *
+	NewCopy(
+	);
+
+	~KX_SlowParentRelation(
+	);
+
+private :
+
+	KX_SlowParentRelation(
+		MT_Scalar relaxation
+	);
+
+	// the relaxation coefficient.
+
+	MT_Scalar m_relax;
+
+	/**
+	 * Looks like a hack flag to me.
+	 * We need to compute valid world coordinates the first
+	 * time we update spatial data of the child. This is done
+	 * by just doing a normal parent relation the first time
+	 * UpdateChildCoordinates is called and then doing the
+	 * slow parent relation 
+	 */
+
+	bool m_initialized;
+
+};
+
+
+
+
+
+
+
+
+
+
+
+
+
+