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diff --git a/src/functors/lattice/indicator/blockIndicatorBaseF3D.hh b/src/functors/lattice/indicator/blockIndicatorBaseF3D.hh
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+++ b/src/functors/lattice/indicator/blockIndicatorBaseF3D.hh
@@ -0,0 +1,88 @@
+/*  This file is part of the OpenLB library
+ *
+ *  Copyright (C) 2017 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_INDICATOR_BASE_F_3D_HH
+#define BLOCK_INDICATOR_BASE_F_3D_HH
+
+#include "blockIndicatorBaseF3D.h"
+#include "geometry/blockGeometry3D.h"
+
+namespace olb {
+
+template <typename T>
+BlockIndicatorF3D<T>::BlockIndicatorF3D(BlockGeometryStructure3D<T>& geometry)
+  : BlockF3D<bool>(geometry.getBlockStructure(), 1),
+    _blockGeometryStructure(geometry),
+    _cachedData{nullptr}
+{ }
+
+template <typename T>
+BlockGeometryStructure3D<T>& BlockIndicatorF3D<T>::getBlockGeometryStructure()
+{
+  return _blockGeometryStructure;
+}
+
+template <typename T>
+bool BlockIndicatorF3D<T>::operator() (const int input[])
+{
+  bool output{};
+  if (_cachedData == nullptr) {
+    this->operator()(&output, input);
+  }
+  else {
+    _cachedData->get(input[0], input[1], input[2]);
+  }
+  return output;
+}
+
+template <typename T>
+bool BlockIndicatorF3D<T>::operator() (int iX, int iY, int iZ)
+{
+  bool output{};
+  if (_cachedData == nullptr) {
+    this->operator()(&output, iX, iY, iZ);
+  }
+  else {
+    _cachedData->get(iX, iY, iZ);
+  }
+  return output;
+}
+
+template <typename T>
+void BlockIndicatorF3D<T>::setCache(const BlockData3D<T,bool>& cache)
+{
+  _cachedData = &cache;
+}
+
+template <typename T>
+bool BlockIndicatorF3D<T>::isEmpty()
+{
+  // There is no way to determine domain emptyness in a fashion that is both
+  // generic and efficient.
+  return false;
+}
+
+
+} // namespace olb
+
+#endif