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diff --git a/src/boundary/extendedFiniteDifferenceBoundary3D.h b/src/boundary/extendedFiniteDifferenceBoundary3D.h
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+/*  This file is part of the OpenLB library
+ *
+ *  Copyright (C) 2007 Orestis Malaspinas, Jonas Latt
+ *  E-mail contact: info@openlb.net
+ *  The most recent release of OpenLB can be downloaded at
+ *  <http://www.openlb.net/>
+ *
+ *  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.
+*/
+
+#ifndef EXTENDED_FINITE_DIFFERENCE_BOUNDARY_3D_H
+#define EXTENDED_FINITE_DIFFERENCE_BOUNDARY_3D_H
+
+#include "core/postProcessing.h"
+#include "momentaOnBoundaries.h"
+#include "core/blockLattice3D.h"
+#include "boundaryCondition3D.h"
+
+
+namespace olb {
+
+/**
+* This class computes the finite difference approximation to LB boundary conditions
+* on a plane wall in 3D with all the terms of the CE expansion.
+*/
+
+template<typename T, typename DESCRIPTOR, int direction, int orientation>
+class ExtendedFdPlaneBoundaryPostProcessor3D : public LocalPostProcessor3D<T,DESCRIPTOR> {
+public:
+  ExtendedFdPlaneBoundaryPostProcessor3D (int x0_, int x1_, int y0_, int y1_, int z0_, int z1_);
+  int extent() const override
+  {
+    return 1;
+  }
+  int extent(int whichDirection) const override
+  {
+    return 1;
+  }
+  void process(BlockLattice3D<T,DESCRIPTOR>& blockLattice) override;
+  void processSubDomain(BlockLattice3D<T,DESCRIPTOR>& blockLattice,
+                                int x0_, int x1_, int y0_, int y1_, int z0_, int z1_) override;
+private:
+  template<int deriveDirection>
+  void interpolateGradients( BlockLattice3D<T,DESCRIPTOR> const& blockLattice,
+                             T velDeriv[DESCRIPTOR::d], int iX, int iY, int iZ ) const;
+
+  template<int deriveDirection>
+  void interpolateGradients ( BlockLattice3D<T,DESCRIPTOR> const& blockLattice,
+                              T& rhoDeriv, int iX, int iY, int iZ) const;
+private:
+  int x0, x1, y0, y1, z0, z1;
+};
+
+template<typename T, typename DESCRIPTOR, int direction, int orientation>
+class ExtendedFdPlaneBoundaryProcessorGenerator3D
+  : public PostProcessorGenerator3D<T,DESCRIPTOR> {
+public:
+  ExtendedFdPlaneBoundaryProcessorGenerator3D(int x0_, int x1_, int y0_, int y1_, int z0_, int z1_);
+  PostProcessor3D<T,DESCRIPTOR>* generate() const override;
+  PostProcessorGenerator3D<T,DESCRIPTOR>*  clone() const override;
+};
+
+
+////////// Factory function for Extended Finite Difference BC ///////////////////////////////
+
+template<typename T, typename DESCRIPTOR, typename MixinDynamics=BGKdynamics<T,DESCRIPTOR> >
+OnLatticeBoundaryCondition3D<T,DESCRIPTOR>* createExtendedFdBoundaryCondition3D(BlockLatticeStructure3D<T,DESCRIPTOR>& block);
+
+}
+
+#endif