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diff --git a/src/functors/analytical/indicator/indicCalc3D.hh b/src/functors/analytical/indicator/indicCalc3D.hh
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+++ b/src/functors/analytical/indicator/indicCalc3D.hh
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+/*  This file is part of the OpenLB library
+ *
+ *  Copyright (C) 2018 Albert Mink
+ *  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 INDIC_CALC_3D_HH
+#define INDIC_CALC_3D_HH
+
+#include "indicCalc3D.h"
+
+namespace olb {
+
+
+template <typename S, template<typename U> class F>
+IndicCalc3D<S,F>::IndicCalc3D(std::shared_ptr<IndicatorF3D<S>> f, std::shared_ptr<IndicatorF3D<S>> g)
+  : _f(f), _g(g)
+{
+  for ( int i=0; i<3; i++) {
+    this->_myMin[i] = std::min(_f->getMin()[i], _g->getMin()[i]);
+    this->_myMax[i] = std::max(_f->getMax()[i], _g->getMax()[i]);
+  }
+}
+
+
+
+template <typename S, template<typename> class F>
+bool IndicCalc3D<S,F>::operator()( bool output[], const S input[3])
+{
+  // componentwise operation on equidimensional functors
+  bool* outputF = output;
+  _f->operator()(outputF, input);
+
+  bool outputG[this->getTargetDim()];
+  _g->operator()(outputG, input);
+
+  for (int i = 0; i < this->getTargetDim(); i++) {
+    output[i] = F<S>()(outputF[i], outputG[i]);
+  }
+  return output;
+}
+
+
+
+
+//// no association to a operator+ from a class is needed, thus we have these free functions
+template<typename S, template <typename U> class F1, template <typename V> class F2,
+         typename>
+std::shared_ptr<IndicatorF3D<S>> operator+(std::shared_ptr<F1<S>> lhs, std::shared_ptr<F2<S>> rhs)
+{
+  return std::make_shared<IndicPlus3D<S>>(lhs, rhs);
+}
+
+template<typename S, template <typename U> class F1, template <typename V> class F2,
+         typename>
+std::shared_ptr<IndicatorF3D<S>> operator-(std::shared_ptr<F1<S>> lhs, std::shared_ptr<F2<S>> rhs)
+{
+  return std::make_shared<IndicMinus3D<S>>(lhs, rhs);
+}
+
+template<typename S, template <typename U> class F1, template <typename V> class F2,
+         typename>
+std::shared_ptr<IndicatorF3D<S>> operator*(std::shared_ptr<F1<S>> lhs, std::shared_ptr<F2<S>> rhs)
+{
+  return std::make_shared<IndicMultiplication3D<S>>(lhs, rhs);
+}
+
+// template specialization for indicatorIdentity
+template<typename S, template <typename U> class F1, template <typename V> class F2,
+         typename>
+std::shared_ptr<IndicatorF3D<S>> operator+(F1<S> & lhs, std::shared_ptr<F2<S>> rhs)
+{
+  return lhs._f + rhs;
+}
+
+template<typename S, template <typename U> class F1, template <typename V> class F2,
+         typename>
+std::shared_ptr<IndicatorF3D<S>> operator-(F1<S> & lhs, std::shared_ptr<F2<S>> rhs)
+{
+  return lhs._f - rhs;
+}
+
+template<typename S, template <typename U> class F1, template <typename V> class F2,
+         typename>
+std::shared_ptr<IndicatorF3D<S>> operator*(F1<S> & lhs, std::shared_ptr<F2<S>> rhs)
+{
+  return lhs._f * rhs;
+}
+
+
+} // end namespace olb
+
+#endif