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diff --git a/intern/bsp/intern/BSP_CSGHelper.h b/intern/bsp/intern/BSP_CSGHelper.h
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+++ b/intern/bsp/intern/BSP_CSGHelper.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_CSGHELPER_H
+
+#define BSP_CSGHELPER_H
+
+class BSP_CSGMesh;
+class BSP_MeshFragment;
+
+#include "../extern/CSG_BooleanOps.h"
+#include "BSP_MeshPrimitives.h"
+
+enum BSP_OperationType{
+	e_intern_csg_union,
+	e_intern_csg_intersection,
+	e_intern_csg_difference
+};
+
+class BSP_CSGHelper {
+public :
+
+	BSP_CSGHelper(
+	);
+
+		bool
+	ComputeOp(
+		BSP_CSGMesh * obA,
+		BSP_CSGMesh * obB,
+		BSP_OperationType op_type, 
+		BSP_CSGMesh & output,
+		CSG_InterpolateUserFaceVertexDataFunc fv_func
+	);
+
+	
+	~BSP_CSGHelper(
+	);
+
+private:
+
+	// Iterate through the fragment,
+	// add new vertices to output,
+	// map polygons to new vertices.
+
+		void
+	DuplicateMesh(
+		const BSP_MeshFragment & frag,
+		BSP_CSGMesh & output
+	);
+
+		void
+	TranslateSplitFragments(
+		const BSP_MeshFragment & in_frag,
+		const BSP_MeshFragment & out_frag,
+		const BSP_MeshFragment & on_frag,
+		BSP_Classification keep,
+		BSP_MeshFragment & spanning_frag,
+		BSP_MeshFragment & output
+	);
+
+		void
+	MergeFrags(
+		const BSP_MeshFragment & in,
+		BSP_MeshFragment & out
+	);
+
+	
+
+};
+
+#endif