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diff --git a/source/blender/blenkernel/BKE_mesh_runtime.h b/source/blender/blenkernel/BKE_mesh_runtime.h
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+++ b/source/blender/blenkernel/BKE_mesh_runtime.h
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+/*
+ * ***** BEGIN GPL 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.
+ *
+ * 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, 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): Blender Foundation
+ *
+ * ***** END GPL LICENSE BLOCK *****
+ */
+#ifndef __BKE_MESH_RUNTIME_H__
+#define __BKE_MESH_RUNTIME_H__
+
+/** \file BKE_mesh_runtime.h
+ *  \ingroup bke
+ *
+ * This file contains access functions for the Mesh.runtime struct.
+ */
+
+struct Mesh;
+struct MLoop;
+struct MLoopTri;
+struct MVertTri;
+
+void BKE_mesh_runtime_reset(struct Mesh *mesh);
+int BKE_mesh_runtime_looptri_len(const struct Mesh *mesh);
+void BKE_mesh_runtime_looptri_recalc(struct Mesh *mesh);
+const struct MLoopTri *BKE_mesh_runtime_looptri_ensure(struct Mesh *mesh);
+bool BKE_mesh_runtime_ensure_edit_data(struct Mesh *mesh);
+bool BKE_mesh_runtime_clear_edit_data(struct Mesh *mesh);
+void BKE_mesh_runtime_clear_geometry(struct Mesh *mesh);
+void BKE_mesh_runtime_clear_cache(struct Mesh *mesh);
+
+void BKE_mesh_runtime_verttri_from_looptri(
+        struct MVertTri *r_verttri,
+        const struct MLoop *mloop, const struct MLoopTri *looptri, int looptri_num);
+
+
+#endif /* __BKE_MESH_RUNTIME_H__ */