diff --git a/examples/ClientTests/compact/BoxOfStraws.xml b/examples/ClientTests/compact/BoxOfStraws.xml
new file mode 100644
index 0000000000000000000000000000000000000000..243e4eaeee55b5ccf6be34eaf3938647c9070e9e
--- /dev/null
+++ b/examples/ClientTests/compact/BoxOfStraws.xml
@@ -0,0 +1,84 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<lccdd>
+<!-- #==========================================================================
+ # AIDA Detector description implementation
+ #==========================================================================
+ # 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 $DD4hepINSTALL/doc/CREDITS.
+ #
+ #==========================================================================
+-->
+
+ <info name="BoxOfStraws"
+ title="Test with silicon boxes"
+ author="Markus Frank"
+ url="http://www.cern.ch/frankm"
+ status="development"
+ version="1.0">
+ <comment>Alignment test with 2 simple boxes</comment>
+ </info>
+
+ <includes>
+ <gdmlFile ref="${DD4hepINSTALL}/DDDetectors/compact/elements.xml"/>
+ <gdmlFile ref="${DD4hepINSTALL}/DDDetectors/compact/materials.xml"/>
+ </includes>
+
+ <define>
+ <constant name="world_size" value="3*m"/>
+ <constant name="world_x" value="world_size"/>
+ <constant name="world_y" value="world_size"/>
+ <constant name="world_z" value="world_size"/>
+ </define>
+
+ <display>
+ <vis name="Invisible" showDaughters="false" visible="false"/>
+ <vis name="InvisibleWithChildren" showDaughters="true" visible="false"/>
+ <vis name="VisibleRed" alpha="0.4" r="1.0" g="0.0" b="0.0" showDaughters="true" visible="true"/>
+ <vis name="VisibleBlue" alpha="1.0" r="0.0" g="0.0" b="1.0" showDaughters="false" visible="true"/>
+ <vis name="VisibleGreen" alpha="1.0" r="0.0" g="1.0" b="0.0" drawingStyle="solid" lineStyle="solid" showDaughters="true" visible="true"/>
+ </display>
+
+ <limits>
+ <limitset name="BoxOfStrawsLimitSet">
+ <limit name="step_length_max" particles="*" value="1.0" unit="mm" />
+ <limit name="track_length_max" particles="*" value="1.0" unit="mm" />
+ </limitset>
+ </limits>
+
+ <regions>
+ <region name="StrawRegion" eunit="MeV" lunit="mm" cut="0.001" threshold="0.001">
+ <limitsetref name="BoxOfStrawsLimitSet"/>
+ </region>
+ </regions>
+
+ <detectors>
+ <detector id="1" name="BoxOfStrawsDet" type="DD4hep_BoxOfStraws" readout="BoxOfStrawsHits" vis="VisibleGreen" region="StrawRegion" limits="BoxOfStrawsLimitSet">
+ <box x="1*m" y="1*m" z="1000*mm" limits="BoxOfStrawsLimitSet" vis="VisibleRed"/>
+ <straw rmax="1*mm" y="1*m" vis="VisibleBlue">
+ <material name="Iron"/>
+ <non_sensitive/>
+ </straw>
+ <position x="0*m" y="0*m" z="0*m"/>
+ <rotation x="0" y="0" z="0"/>
+ </detector>
+ </detectors>
+
+ <readouts>
+ <readout name="BoxOfStrawsHits">
+ <id>system:8,module:16,straw:16,y:-12</id>
+ </readout>
+ </readouts>
+
+ <fields>
+ <field name="GlobalSolenoid" type="solenoid"
+ inner_field="5.0*tesla"
+ outer_field="-1.5*tesla"
+ zmax="2*m"
+ outer_radius="2*m">
+ </field>
+ </fields>
+
+</lccdd>
diff --git a/examples/ClientTests/scripts/BoxOfStraws.py b/examples/ClientTests/scripts/BoxOfStraws.py
new file mode 100644
index 0000000000000000000000000000000000000000..1ea12406dc7de37ae8103456a7a78eb845470d79
--- /dev/null
+++ b/examples/ClientTests/scripts/BoxOfStraws.py
@@ -0,0 +1,118 @@
+# ==========================================================================
+# AIDA Detector description implementation
+# --------------------------------------------------------------------------
+# 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.
+#
+# ==========================================================================
+#
+#
+from __future__ import absolute_import, unicode_literals
+import os
+import time
+import cmath
+import DDG4
+from DDG4 import OutputLevel as Output
+from g4units import GeV, MeV, m
+#
+#
+"""
+
+ dd4hep simulation example setup using the python configuration
+
+ @author M.Frank
+ @version 1.0
+
+"""
+
+
+def run():
+ args = DDG4.CommandLine()
+ kernel = DDG4.Kernel()
+ logger = DDG4.Logger('BoxOfStraws')
+ install_dir = os.environ['DD4hepExamplesINSTALL']
+ kernel.loadGeometry(str("file:" + install_dir + "/examples/ClientTests/compact/BoxOfStraws.xml"))
+
+ DDG4.importConstants(kernel.detectorDescription(), debug=False)
+ geant4 = DDG4.Geant4(kernel, tracker='Geant4TrackerCombineAction')
+ geant4.printDetectors()
+ # Configure UI
+ if args.macro:
+ ui = geant4.setupCshUI(macro=args.macro)
+ else:
+ ui = geant4.setupCshUI()
+ if args.batch:
+ ui.Commands = ['/run/beamOn ' + str(args.events), '/ddg4/UI/terminate']
+
+ # Configure field
+ geant4.setupTrackingField(prt=True)
+ # Configure Event actions
+ prt = DDG4.EventAction(kernel, 'Geant4ParticlePrint/ParticlePrint')
+ prt.OutputLevel = Output.DEBUG
+ prt.OutputType = 3
+ kernel.eventAction().adopt(prt)
+
+ generator_output_level = Output.DEBUG
+
+ # Configure G4 geometry setup
+ seq, act = geant4.addDetectorConstruction("Geant4DetectorGeometryConstruction/ConstructGeo")
+ act.DebugVolumes = True
+ #
+ # Assign sensitive detectors according to the declarations 'tracker' or 'calorimeter', etc
+ seq, act = geant4.addDetectorConstruction("Geant4DetectorSensitivesConstruction/ConstructSD")
+ #
+ # Assign sensitive detectors in Geant4 by matching a regular expression in the detector sub-tree
+ seq, act = geant4.addDetectorConstruction("Geant4RegexSensitivesConstruction/ConstructSDRegEx")
+ act.Detector = 'BoxOfStrawsDet'
+ act.Regex = '/world_volume_(.*)/BoxOfStrawsDet_(.*)/row_(.*)/straw_(.*)'
+ act.OutputLevel = Output.ALWAYS
+ act.enableUI()
+
+ # Configure I/O
+ geant4.setupROOTOutput('RootOutput', 'BoxOfStraws_' + time.strftime('%Y-%m-%d_%H-%M'))
+
+ # Setup particle gun
+ gun = geant4.setupGun("Gun", particle='e+', energy=10 * GeV, multiplicity=1)
+ gun.OutputLevel = Output.DEBUG
+
+ # And handle the simulation particles.
+ part = DDG4.GeneratorAction(kernel, "Geant4ParticleHandler/ParticleHandler")
+ kernel.generatorAction().adopt(part)
+ part.SaveProcesses = ['Decay']
+ part.MinimalKineticEnergy = 100 * MeV
+ part.OutputLevel = Output.DEBUG # generator_output_level
+ part.enableUI()
+ user = DDG4.Action(kernel, "Geant4TCUserParticleHandler/UserParticleHandler")
+ user.TrackingVolume_Zmax = 2.5 * m
+ user.TrackingVolume_Rmax = 2.5 * m
+ user.enableUI()
+ part.adopt(user)
+
+ # Map sensitive detectors of type 'BoxOfStraws' to Geant4CalorimeterAction
+ sd = geant4.description.sensitiveDetector(str('BoxOfStrawsDet'))
+ logger.info(f'+++ BoxOfStraws: SD type: {str(sd.type())}')
+ seq, act = geant4.setupDetector(name='BoxOfStrawsDet', action='MyTrackerSDAction')
+ act.HaveCellID = False
+
+ # Now build the physics list:
+ phys = geant4.setupPhysics(str('QGSP_BERT'))
+ ph = DDG4.PhysicsList(kernel, str('Geant4PhysicsList/Myphysics'))
+ # Add b osons to the model (redundant if already implemented by the model)
+ ph.addParticleGroup(str('G4BosonConstructor'))
+ ph.addParticleGroup(str('G4BaryonConstructor'))
+ ph.addParticleGroup(str('G4MesonConstructor'))
+ ph.addParticleGroup(str('G4LeptonConstructor'))
+ # Add multiple scattering in the material
+ ph.addParticleProcess(str('e[+-]'), str('G4eMultipleScattering'), -1, 1, 1)
+ # Interactivity
+ ph.enableUI()
+ phys.adopt(ph)
+ phys.dump()
+ geant4.execute()
+
+
+if __name__ == "__main__":
+ run()
diff --git a/examples/ClientTests/src/BoxOfStraws_geo.cpp b/examples/ClientTests/src/BoxOfStraws_geo.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..b6ce0e35250f654710a53a1aa3b3f769d0a2703f
--- /dev/null
+++ b/examples/ClientTests/src/BoxOfStraws_geo.cpp
@@ -0,0 +1,85 @@
+//==========================================================================
+// AIDA Detector description implementation
+//--------------------------------------------------------------------------
+// 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
+//
+//==========================================================================
+//
+//
+// Display using:
+// $> geoDisplay examples/ClientTests/compact/BoxOfStraws.xml
+//
+//==========================================================================
+#include <DD4hep/DetFactoryHelper.h>
+#include <DD4hep/Printout.h>
+
+using namespace dd4hep;
+
+static Ref_t create_detector(Detector& description, xml_h e, SensitiveDetector sens) {
+ double tol = 1e-2;
+ xml_det_t x_det = e;
+ xml_dim_t x_box = x_det.child(_U(box));
+ xml_dim_t x_rot = x_det.child(_U(rotation));
+ xml_dim_t x_pos = x_det.child(_U(position));
+ xml_det_t x_straw = x_det.child(_Unicode(straw));
+ std::string nam = x_det.nameStr();
+ const double delta = 2e0*x_straw.rmax();
+ const int num_x = int(2e0*x_box.x() / delta);
+ const int num_z = int(2e0*x_box.z() / delta);
+
+ // Have box like straws: voxelization should be more efficient and for our test it does not matter.
+ Tube straw(0., x_straw.rmax()-tol, x_straw.y()-tol);
+ //Box straw(x_straw.rmax()-tol, x_straw.rmax()-tol, x_straw.y()-tol);
+ Volume straw_vol("straw", straw, description.material(x_straw.materialStr()));
+
+ straw_vol.setAttributes(description, x_straw.regionStr(), x_straw.limitsStr(), x_straw.visStr());
+ printout(INFO, "BoxOfStraws", "%s: Straw: rmax: %7.3f y: %7.3f mat: %s vis: %s solid: %s",
+ nam.c_str(), x_straw.rmax(), x_straw.y(), x_straw.materialStr().c_str(),
+ x_straw.visStr().c_str(), straw.type());
+ if ( x_straw.hasChild(_U(sensitive)) ) {
+ sens.setType("tracker");
+ straw_vol.setSensitiveDetector(sens);
+ }
+
+ Box box(x_box.x(), x_box.y(), x_box.z());
+ Volume box_vol(nam, box, description.air());
+ box_vol.setAttributes(description, x_box.regionStr(), x_box.limitsStr(), x_box.visStr());
+
+ Box row(x_box.x(), x_box.y(), x_straw.rmax());
+ Volume row_vol("row", row, description.air());
+ row_vol.setVisAttributes(description.visAttributes("InvisibleWithChildren"));
+
+ printout(INFO, "BoxOfStraws", "%s: Row: nx: %7d nz: %7d delta: %7.3f", nam.c_str(), num_x, num_z, delta);
+ for( int ix=0; ix < num_x; ++ix ) {
+ double x = -box.x() + (double(ix)+0.5) * delta;
+ PlacedVolume pv = row_vol.placeVolume(straw_vol, Position(x, 0e0, 0e0));
+ pv.addPhysVolID("straw", ix);
+ }
+
+ // Not terribly clever: better would be to place layers instead of single straws....
+ Rotation3D rot(RotationZYX(0e0, 0e0, M_PI/2e0));
+ for( int iz=0; iz < num_z; ++iz ) {
+ double z = -box.z() + (double(iz)+0.5) * delta;
+ PlacedVolume pv = box_vol.placeVolume(row_vol, Transform3D(rot, Position(0e0, 0e0, z)));
+ pv.addPhysVolID("module", iz);
+ }
+ printout(INFO, "BoxOfStraws", "%s: Created %d rows of %d straws each.", nam.c_str(), num_z, num_x);
+
+ DetElement sdet (nam, x_det.id());
+ Volume mother(description.pickMotherVolume(sdet));
+ Rotation3D rot3D (RotationZYX(x_rot.z(0), x_rot.y(0), x_rot.x(0)));
+ Transform3D trafo (rot3D, Position(x_pos.x(0), x_pos.y(0), x_pos.z(0)));
+ PlacedVolume pv = mother.placeVolume(box_vol, trafo);
+ pv.addPhysVolID("system", x_det.id());
+ sdet.setPlacement(pv); // associate the placed volume to the detector element
+ printout(INFO, "BoxOfStraws", "%s: Detector construction finished.", nam.c_str());
+ return sdet;
+}
+
+DECLARE_DETELEMENT(DD4hep_BoxOfStraws,create_detector)