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diff --git a/extern/mantaflow/preprocessed/kernel.h b/extern/mantaflow/preprocessed/kernel.h
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+
+
+// DO NOT EDIT !
+// This file is generated using the MantaFlow preprocessor (prep generate).
+
+/******************************************************************************
+ *
+ * MantaFlow fluid solver framework
+ * Copyright 2011-2014 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
+ *
+ * Function and macros for defining compution kernels over grids
+ *
+ ******************************************************************************/
+
+#ifndef _KERNEL_H
+#define _KERNEL_H
+
+#if TBB == 1
+#  include <tbb/blocked_range3d.h>
+#  include <tbb/blocked_range.h>
+#  include <tbb/parallel_for.h>
+#  include <tbb/parallel_reduce.h>
+#endif
+
+#if OPENMP == 1
+#  include <omp.h>
+#endif
+
+#include "general.h"
+
+namespace Manta {
+
+// fwd decl
+class GridBase;
+class Grid4dBase;
+class ParticleBase;
+
+// simple iteration
+#define FOR_IJK_BND(grid, bnd) \
+  for (int k = ((grid).is3D() ? bnd : 0), \
+           __kmax = ((grid).is3D() ? ((grid).getSizeZ() - bnd) : 1); \
+       k < __kmax; \
+       k++) \
+    for (int j = bnd; j < (grid).getSizeY() - bnd; j++) \
+      for (int i = bnd; i < (grid).getSizeX() - bnd; i++)
+
+#define FOR_IJK_REVERSE(grid) \
+  for (int k = (grid).getSizeZ() - 1; k >= 0; k--) \
+    for (int j = (grid).getSizeY() - 1; j >= 0; j--) \
+      for (int i = (grid).getSizeX() - 1; i >= 0; i--)
+
+#define FOR_IDX(grid) \
+  for (IndexInt idx = 0, total = (grid).getSizeX() * (grid).getSizeY() * (grid).getSizeZ(); \
+       idx < total; \
+       idx++)
+
+#define FOR_IJK(grid) FOR_IJK_BND(grid, 0)
+
+#define FOR_PARTS(parts) for (IndexInt idx = 0, total = (parts).size(); idx < total; idx++)
+
+// simple loop over 4d grids
+#define FOR_IJKT_BND(grid, bnd) \
+  for (int t = ((grid).is4D() ? bnd : 0); t < ((grid).is4D() ? ((grid).getSizeT() - bnd) : 1); \
+       ++t) \
+    for (int k = ((grid).is3D() ? bnd : 0); k < ((grid).is3D() ? ((grid).getSizeZ() - bnd) : 1); \
+         ++k) \
+      for (int j = bnd; j < (grid).getSizeY() - bnd; ++j) \
+        for (int i = bnd; i < (grid).getSizeX() - bnd; ++i)
+
+//! Basic data structure for kernel data, initialized based on kernel type (e.g. single, idx, etc).
+struct KernelBase {
+  int maxX, maxY, maxZ, minZ, maxT, minT;
+  int X, Y, Z, dimT;
+  IndexInt size;
+
+  KernelBase(IndexInt num);
+  KernelBase(const GridBase *base, int bnd);
+  KernelBase(const Grid4dBase *base, int bnd);
+
+  // specify in your derived classes:
+
+  // kernel operators
+  // ijk mode: void operator() (int i, int j, int k)
+  // idx mode: void operator() (IndexInt idx)
+
+  // reduce mode:
+  // void join(classname& other)
+  // void setup()
+};
+
+}  // namespace Manta
+
+// all kernels will automatically be added to the "Kernels" group in doxygen
+
+#endif