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diff --git a/intern/bsp/intern/BSP_CSGISplitter.h b/intern/bsp/intern/BSP_CSGISplitter.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 BSP_CSGISplitter_h
+
+#define BSP_CSGISplitter_h
+
+class BSP_MeshFragment;
+class BSP_CSGMesh;
+
+class MT_Plane3;
+
+/**
+ * This class defines a mesh splitter interface.
+ * It embodies the action of splitting a mesh by a plane.
+ * Depending on the context of the operation subclasses
+ * may wish to define different implementations. For example
+ * with building a BSP tree from a mesh, the mesh does not
+ * need to be kept consistent, it doesn't matter if the edges
+ * are maintained etc. However when pushing polygons through
+ * a BSP tree (say for CSG operations)it is important to 
+ * try and maintain mesh connectivity and thus a different 
+ * splitter implementation may be needed.
+ * 
+ * This is an abstract interface class.
+ */
+
+class BSP_CSGISplitter
+{
+
+public:
+
+	/**
+	 * Split the incoming mesh fragment (frag)
+	 * by the plane, put the output into (in,out and on)
+	 * Subclasses should clear the contents of the 
+	 * in_coming fragment.
+	 */
+
+	virtual 
+		void
+	Split(
+		const MT_Plane3& plane,
+		BSP_MeshFragment *frag,
+		BSP_MeshFragment *in_frag,
+		BSP_MeshFragment *out_frag,
+		BSP_MeshFragment *on_frag,
+		BSP_MeshFragment *spanning_frag
+	)= 0;
+
+	/**
+	 * Split the entire mesh with respect to the plane.
+	 * and place ouput into (in,out and on).
+	 * Subclasses should clear the contents of the 
+	 * in_coming fragment.
+	 */
+	virtual 
+		void
+	Split(
+		BSP_CSGMesh & mesh,
+		const MT_Plane3& plane,
+		BSP_MeshFragment *in_frag,
+		BSP_MeshFragment *out_frag,
+		BSP_MeshFragment *on_frag,
+		BSP_MeshFragment *spanning_frag
+	)=0;
+		
+		virtual
+	~BSP_CSGISplitter(
+	){
+	};
+
+protected :
+
+	BSP_CSGISplitter(
+	) {
+		//nothing to do
+	}
+	
+	BSP_CSGISplitter(
+		const BSP_CSGISplitter &
+	) {
+		//nothing to do
+	}
+};
+
+
+
+#endif
+