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diff --git a/extern/mantaflow/preprocessed/edgecollapse.h b/extern/mantaflow/preprocessed/edgecollapse.h
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+
+
+// DO NOT EDIT !
+// This file is generated using the MantaFlow preprocessor (prep generate).
+
+/******************************************************************************
+ *
+ * MantaFlow fluid solver framework
+ * Copyright 2011 Tobias Pfaff, Nils Thuerey
+ *
+ * This program is free software, distributed under the terms of the
+ * Apache License, Version 2.0
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Mesh edge collapse and subdivision
+ *
+ ******************************************************************************/
+
+/******************************************************************************/
+// Copyright note:
+//
+// These functions (C) Chris Wojtan
+// Long-term goal is to unify with his split&merge codebase
+//
+/******************************************************************************/
+
+#ifndef _EDGECOLLAPSE_H
+#define _EDGECOLLAPSE_H
+
+#include "mesh.h"
+
+namespace Manta {
+
+void CollapseEdge(Mesh &mesh,
+                  const int trinum,
+                  const int which,
+                  const Vec3 &edgevect,
+                  const Vec3 &endpoint,
+                  std::vector<int> &deletedNodes,
+                  std::map<int, bool> &taintedTris,
+                  int &numCollapses,
+                  bool doTubeCutting);
+
+Vec3 ModifiedButterflySubdivision(Mesh &mesh,
+                                  const Corner &ca,
+                                  const Corner &cb,
+                                  const Vec3 &fallback);
+
+}  // namespace Manta
+
+#endif