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diff --git a/extern/carve/lib/csg_data.hpp b/extern/carve/lib/csg_data.hpp
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+++ b/extern/carve/lib/csg_data.hpp
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+// Begin License:
+// Copyright (C) 2006-2011 Tobias Sargeant (tobias.sargeant@gmail.com).
+// All rights reserved.
+//
+// This file is part of the Carve CSG Library (http://carve-csg.com/)
+//
+// This file may be used under the terms of the GNU General Public
+// License version 2.0 as published by the Free Software Foundation
+// and appearing in the file LICENSE.GPL2 included in the packaging of
+// this file.
+//
+// This file is provided "AS IS" with NO WARRANTY OF ANY KIND,
+// INCLUDING THE WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE.
+// End:
+
+
+#pragma once
+
+#include <carve/csg.hpp>
+
+#include "csg_detail.hpp"
+
+struct carve::csg::detail::Data {
+//        * @param[out] vmap A mapping from vertex pointer to intersection point.
+//        * @param[out] emap A mapping from edge pointer to intersection points.
+//        * @param[out] fmap A mapping from face pointer to intersection points.
+//        * @param[out] fmap_rev A mapping from intersection points to face pointers.
+  // map from intersected vertex to intersection point.
+  VVMap vmap;
+
+  // map from intersected edge to intersection points.
+  EVSMap emap;
+
+  // map from intersected face to intersection points.
+  FVSMap fmap;
+
+  // map from intersection point to intersected faces.
+  VFSMap fmap_rev;
+
+  // created by divideEdges().
+  // holds, for each edge, a 
+  EVVMap divided_edges;
+
+  // created by faceSplitEdges.
+  FV2SMap face_split_edges;
+
+  // mapping from vertex to edge for potentially intersected
+  // faces. Saves building the vertex to edge map for all faces of
+  // both meshes.
+  VEVecMap vert_to_edges;
+};