diff --git a/DDCore/include/DD4hep/Dictionary.h b/DDCore/include/DD4hep/Dictionary.h
index 956246a8523850ebc92acdee7b2346ef2465311d..93da4678fd3700674c1f6bc561f3bcf4c870a84a 100644
--- a/DDCore/include/DD4hep/Dictionary.h
+++ b/DDCore/include/DD4hep/Dictionary.h
@@ -380,6 +380,7 @@ template vector<pair<string, int> >::iterator;
// -------------------------------------------------------------------------
#ifdef __HAVE_DDSEGMENTATION__
#include "DDSegmentation/Segmentation.h"
+#include "DDSegmentation/NoSegmentation.h"
#include "DDSegmentation/CartesianGrid.h"
#include "DDSegmentation/CartesianGridXY.h"
#include "DDSegmentation/CartesianGridXYZ.h"
@@ -408,6 +409,7 @@ typedef DD4hep::DDSegmentation::CellID CellID;
#endif
#pragma link C++ class DD4hep::DDSegmentation::Segmentation+;
+#pragma link C++ class DD4hep::DDSegmentation::NoSegmentation+;
#pragma link C++ class DD4hep::DDSegmentation::CartesianGrid+;
#pragma link C++ class DD4hep::DDSegmentation::CartesianGridXY+;
#pragma link C++ class DD4hep::DDSegmentation::CartesianGridXYZ+;
diff --git a/DDCore/include/DD4hep/NoSegmentation.h b/DDCore/include/DD4hep/NoSegmentation.h
new file mode 100644
index 0000000000000000000000000000000000000000..941f94147bb7dd823f72da817986b18c04a1c5d4
--- /dev/null
+++ b/DDCore/include/DD4hep/NoSegmentation.h
@@ -0,0 +1,67 @@
+//==========================================================================
+// AIDA Detector description implementation for LCD
+//--------------------------------------------------------------------------
+// Copyright (C) Organisation europeenne pour la Recherche nucleaire (CERN)
+// All rights reserved.
+//
+// For the licensing terms see $DD4hepINSTALL/LICENSE.
+// For the list of contributors see $DD4hepINSTALL/doc/CREDITS.
+//
+// \author Markus Frank
+// \date 2016-10-18
+// \version 1.0
+//
+//==========================================================================
+#ifndef DD4HEP_DDCORE_NoSegmentation_H
+#define DD4HEP_DDCORE_NoSegmentation_H 1
+
+// Framework include files
+#include "DD4hep/Segmentations.h"
+
+/// Namespace for the AIDA detector description toolkit
+namespace DD4hep {
+
+ /// Namespace for base segmentations
+ namespace DDSegmentation { class NoSegmentation; }
+
+ /// Namespace for the geometry part of the AIDA detector description toolkit
+ namespace Geometry {
+
+ // Forward declarations
+ class Segmentation;
+ template <typename T> class SegmentationWrapper;
+
+ /// We need some abbreviation to make the code more readable.
+ typedef Handle<SegmentationWrapper<DDSegmentation::NoSegmentation> > NoSegmentationHandle;
+
+ /// Implementation class for the grid XY segmentation.
+ /**
+ *
+ * \author M.Frank
+ * \version 1.0
+ * \ingroup DD4HEP_GEOMETRY
+ */
+ class NoSegmentation : public NoSegmentationHandle {
+ public:
+ /// Defintiion of the basic handled object
+ typedef NoSegmentationHandle::Implementation Object;
+
+ public:
+ NoSegmentation() = default;
+ NoSegmentation(const NoSegmentation& e) = default;
+ NoSegmentation(const Segmentation& e) : Handle<Object>(e) { }
+ NoSegmentation(const Handle<Object>& e) : Handle<Object>(e) { }
+ template <typename Q>
+ NoSegmentation(const Handle<Q>& e) : Handle<Object>(e) { }
+ NoSegmentation& operator=(const NoSegmentation& seg) = default;
+ bool operator==(const NoSegmentation& seg) const {
+ return m_element == seg.m_element;
+ }
+
+ Position position(const CellID& cellID) const;
+ CellID cellID(const Position& local, const Position& global, const VolumeID& volID) const;
+ };
+
+ } /* End namespace Geometry */
+} /* End namespace DD4hep */
+#endif // DD4HEP_DDCORE_NoSegmentation_H
diff --git a/DDCore/python/lcdd.py b/DDCore/python/lcdd.py
index 61b51ff95914d28cc7a3fb12b746f2017338d8cf..8f09277bd36ad334e055402cbcea051ccd5b658b 100644
--- a/DDCore/python/lcdd.py
+++ b/DDCore/python/lcdd.py
@@ -35,6 +35,7 @@ Readout = DD4hep.Geometry.Readout
GridXYZ = DD4hep.Geometry.GridXYZ
GlobalGridXY = DD4hep.Geometry.GlobalGridXY
CartesianGridXY = DD4hep.Geometry.CartesianGridXY
+NoSegmentation = DD4hep.Geometry.NoSegmentation
ProjectiveCylinder = DD4hep.Geometry.ProjectiveCylinder
NonProjectiveCylinder = DD4hep.Geometry.NonProjectiveCylinder
ProjectiveZPlane = DD4hep.Geometry.ProjectiveZPlane
@@ -365,6 +366,10 @@ def create_CartesianGridXY(lcdd, elem) :
if 'gridSizeY' in elem.keys() : obj.setGridSizeY(elem.getF('gridSizeY'))
return obj
+def create_NoSegmentation(lcdd, elem) :
+ obj = NoSegmentation()
+ return obj
+
def create_ProjectiveCylinder(lcdd, elem) :
obj = ProjectiveCylinder()
if 'phiBins' in elem.keys() : obj.setPhiBins(elem.getI('phiBins'))
diff --git a/DDCore/src/NoSegmentation.cpp b/DDCore/src/NoSegmentation.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..51b13eed1f67c0299bd491b3d1e8780b28871484
--- /dev/null
+++ b/DDCore/src/NoSegmentation.cpp
@@ -0,0 +1,35 @@
+//==========================================================================
+// AIDA Detector description implementation for LCD
+//--------------------------------------------------------------------------
+// Copyright (C) Organisation europeenne pour la Recherche nucleaire (CERN)
+// All rights reserved.
+//
+// For the licensing terms see $DD4hepINSTALL/LICENSE.
+// For the list of contributors see $DD4hepINSTALL/doc/CREDITS.
+//
+// Author : M.Frank
+//
+//==========================================================================
+
+// Framework include files
+#include "DD4hep/NoSegmentation.h"
+#include "DD4hep/objects/SegmentationsInterna.h"
+#include "DDSegmentation/NoSegmentation.h"
+
+// C/C++ include files
+
+using namespace std;
+using namespace DD4hep::Geometry;
+
+Position NoSegmentation::position(const CellID& id) const {
+ return Position(access()->implementation->position(id));
+}
+
+/// determine the cell ID based on the position
+DD4hep::CellID NoSegmentation::cellID(const Position& local,
+ const Position& global,
+ const VolumeID& volID) const
+{
+ return access()->implementation->cellID(local, global, volID);
+}
+
diff --git a/DDCore/src/Segmentations.cpp b/DDCore/src/Segmentations.cpp
index d34d91edbd4090146a984ad1c0e954bc974d9ba9..28ef42ea432e40b60f564b8729c0af9e55f3fde0 100644
--- a/DDCore/src/Segmentations.cpp
+++ b/DDCore/src/Segmentations.cpp
@@ -120,6 +120,9 @@ Handle<SensitiveDetectorObject> Segmentation::sensitive() const {
#define IMPLEMENT_SEGMENTATION_HANDLE(X) \
DD4HEP_INSTANTIATE_HANDLE_UNNAMED(SegmentationWrapper<DDSegmentation::X>);
+#include "DDSegmentation/NoSegmentation.h"
+IMPLEMENT_SEGMENTATION_HANDLE(NoSegmentation)
+
#include "DDSegmentation/CartesianGrid.h"
IMPLEMENT_SEGMENTATION_HANDLE(CartesianGrid)
diff --git a/DDCore/src/plugins/LCDDSegmentations.cpp b/DDCore/src/plugins/LCDDSegmentations.cpp
index 29ea51e44c1d6f1761f1477dcdec310235ba47c5..e4d3ee7f36e17e0a27c6205ef9ce2863df08d019 100644
--- a/DDCore/src/plugins/LCDDSegmentations.cpp
+++ b/DDCore/src/plugins/LCDDSegmentations.cpp
@@ -25,6 +25,9 @@ namespace {
}
}
+#include "DDSegmentation/NoSegmentation.h"
+DECLARE_SEGMENTATION(NoSegmentation,create_segmentation<DD4hep::DDSegmentation::NoSegmentation>)
+
#include "DDSegmentation/CartesianGridXY.h"
DECLARE_SEGMENTATION(CartesianGridXY,create_segmentation<DD4hep::DDSegmentation::CartesianGridXY>)
diff --git a/DDSegmentation/include/DDSegmentation/NoSegmentation.h b/DDSegmentation/include/DDSegmentation/NoSegmentation.h
new file mode 100644
index 0000000000000000000000000000000000000000..f9173f299e2792eba74f3162c94f363372568bc6
--- /dev/null
+++ b/DDSegmentation/include/DDSegmentation/NoSegmentation.h
@@ -0,0 +1,33 @@
+/*
+ * NoSegmentation.h
+ *
+ * Created on: Feb. 13 2017
+ * Author: Whitney Armstrong, ANL
+ */
+
+#ifndef DDSegmentation_NoSegmentation_H_
+#define DDSegmentation_NoSegmentation_H_
+
+#include "DDSegmentation/Segmentation.h"
+
+namespace DD4hep {
+ namespace DDSegmentation {
+
+ /** This class exists to provide a segmenation when it is need but doesn't exist. */
+ class NoSegmentation: public Segmentation {
+ public:
+
+ virtual ~NoSegmentation();
+
+ NoSegmentation(const std::string& cellEncoding = "");
+ NoSegmentation(BitField64* decoder);
+
+ virtual Vector3D position(const CellID& cellID) const;
+ virtual CellID cellID(const Vector3D& localPosition, const Vector3D& globalPosition, const VolumeID& volumeID) const;
+
+ };
+
+
+ } /* namespace DDSegmentation */
+} /* namespace DD4hep */
+#endif /* DDSegmentation_NoSegmentation */
diff --git a/DDSegmentation/src/NoSegmentation.cpp b/DDSegmentation/src/NoSegmentation.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..ee90c0fbd6eb742380c015f7f281c0ab27129912
--- /dev/null
+++ b/DDSegmentation/src/NoSegmentation.cpp
@@ -0,0 +1,42 @@
+/*
+ * NoSegmentation.cpp
+ *
+ * Created on: Jun 28, 2013
+ * Author: Christian Grefe, CERN
+ */
+
+#include "DDSegmentation/NoSegmentation.h"
+
+namespace DD4hep {
+ namespace DDSegmentation {
+
+ NoSegmentation::NoSegmentation(const std::string& cellEncoding) :
+ Segmentation(cellEncoding)
+ {
+ _type = "NoSegmentation";
+ _description = "None Segmentation";
+ }
+
+ NoSegmentation::NoSegmentation(BitField64* decode) : Segmentation(decode)
+ {
+ _type = "NoSegmentation";
+ _description = "None Segmentation";
+ }
+
+ NoSegmentation::~NoSegmentation()
+ { }
+
+ Vector3D NoSegmentation::position(const CellID& cID) const
+ {
+ Vector3D cellPosition{0,0,0};
+ return cellPosition;
+ }
+
+ CellID NoSegmentation::cellID(const Vector3D& /*localPosition*/, const Vector3D& /* globalPosition */, const VolumeID& vID) const {
+ return vID;
+ }
+
+REGISTER_SEGMENTATION(NoSegmentation)
+
+ } /* namespace DDSegmentation */
+} /* namespace DD4hep */