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diff --git a/src/functors/lattice/integral/blockIntegralF3D.hh b/src/functors/lattice/integral/blockIntegralF3D.hh
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+++ b/src/functors/lattice/integral/blockIntegralF3D.hh
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+/*  This file is part of the OpenLB library
+ *
+ *  Copyright (C) 2018 Adrian Kummerlaender
+ *  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 BLOCK_INTEGRAL_F_3D_HH
+#define BLOCK_INTEGRAL_F_3D_HH
+
+#include "blockIntegralF3D.h"
+#include "core/olbDebug.h"
+#include "functors/lattice/indicator/blockIndicatorBaseF3D.h"
+
+namespace olb {
+
+
+template <typename T, typename W>
+BlockSum3D<T,W>::BlockSum3D(BlockF3D<W>&          f,
+                            BlockIndicatorF3D<T>& indicatorF)
+  : BlockF3D<W>(f.getBlockStructure(), f.getTargetDim()+1),
+    _f(f),
+    _indicatorF(indicatorF)
+{
+  this->getName() = "BlockSum("+_f.getName()+")";
+}
+
+template <typename T, typename W>
+bool BlockSum3D<T,W>::operator() (W output[], const int input[])
+{
+  OLB_ASSERT(_f.getSourceDim() == _indicatorF.getSourceDim(),
+             "functor source dimension equals indicator source dimension");
+
+  W outputTmp[_f.getTargetDim()];
+  int inputTmp[_f.getSourceDim()];
+  std::size_t voxels(0);
+
+  const auto& blockStructure = this->getBlockStructure();
+
+  for (inputTmp[0] = 0; inputTmp[0] < blockStructure.getNx(); ++inputTmp[0]) {
+    for (inputTmp[1] = 0; inputTmp[1] < blockStructure.getNy(); ++inputTmp[1]) {
+      for (inputTmp[2] = 0; inputTmp[2] < blockStructure.getNz(); ++inputTmp[2]) {
+        if (_indicatorF(inputTmp)) {
+          _f(outputTmp,inputTmp);
+          for (int i = 0; i < _f.getTargetDim(); ++i) {
+            output[i] += outputTmp[i];
+          }
+          voxels += 1;
+        }
+      }
+    }
+  }
+  output[_f.getTargetDim()] += voxels;
+
+  return true;
+}
+
+
+template <typename T, typename W>
+BlockIntegral3D<T,W>::BlockIntegral3D(BlockF3D<W>&          f,
+                                      BlockIndicatorF3D<T>& indicatorF)
+  : BlockF3D<W>(f.getBlockStructure(), f.getTargetDim()),
+    _f(f),
+    _indicatorF(indicatorF)
+{
+  this->getName() = "BlockIntegral("+_f.getName()+")";
+}
+
+template <typename T, typename W>
+bool BlockIntegral3D<T,W>::operator() (W output[], const int input[])
+{
+  OLB_ASSERT(_f.getSourceDim() == _indicatorF.getSourceDim(),
+             "functor source dimension equals indicator source dimension");
+
+  const W weight = pow(_indicatorF.getBlockGeometryStructure().getDeltaR(), 3);
+
+  W outputTmp[_f.getTargetDim()];
+  int inputTmp[_f.getSourceDim()];
+
+  const auto& blockStructure = this->getBlockStructure();
+
+  for (inputTmp[0] = 0; inputTmp[0] < blockStructure.getNx(); ++inputTmp[0]) {
+    for (inputTmp[1] = 0; inputTmp[1] < blockStructure.getNy(); ++inputTmp[1]) {
+      for (inputTmp[2] = 0; inputTmp[2] < blockStructure.getNz(); ++inputTmp[2]) {
+        if (_indicatorF(inputTmp)) {
+          _f(outputTmp,inputTmp);
+          for (int i = 0; i < this->getTargetDim(); ++i) {
+            output[i] += outputTmp[i] * weight;
+          }
+        }
+      }
+    }
+  }
+
+  return true;
+}
+
+
+}
+
+#endif