ReleaseNotes.md

# v01-19

* 2021-11-12 Markus Frank ([PR#882](https://github.com/aidasoft/DD4hep/pull/882))
  - See issue in github: https://github.com/AIDASoft/DD4hep/issues/881
  - Material properties have changed in Geant4 between version 10 and 11.
  - This fix should fix the compilation problems and take new properties in Geant4.11 into account.

* 2021-11-12 MarkusFrankATcernch ([PR#876](https://github.com/aidasoft/DD4hep/pull/876))
  - Fix cmake issue when using cmake 3.16.3 (or any of the other versions of cmake that require special python version handling presumably) in a dependent package.

* 2021-11-10 Ben Couturier ([PR#880](https://github.com/aidasoft/DD4hep/pull/880))
  - Added the default move constructor and default move assignment operator to dd4hep::detail::ConditionObject and dd4hep::NamedObject

* 2021-11-03 Markus Frank ([PR#877](https://github.com/aidasoft/DD4hep/pull/877))
  - To not compromize client code with an enforced termination handler, the DD4hep termination handler
  moved to DDG4, where it actually is needed. In DDG4 the termination handler is activated when the main
  Geant4Kernel instance is created.
  Reasoning: Please see issue https://github.com/AIDASoft/DD4hep/issues/874 .
  - Throw an exception if clients ask a DetElement handle for a child by name if such a child is not present or the handle is invalid. This is the new default now. The old behaviour is kept with a second accessor for children by name, with an explicit statement that an exception is unwanted such as: child = DetElement::child("name", false)
  Please see issue: https://github.com/AIDASoft/DD4hep/issues/878.

* 2021-10-13 Markus Frank ([PR#873](https://github.com/aidasoft/DD4hep/pull/873))
  - Remove internal classes from evaluator. Use STL provided classes 
  - Remove hidden clashes with CLHEP evaluator (move internal class Item to anonymous namespace)

* 2021-09-22 Wouter Deconinck ([PR#872](https://github.com/aidasoft/DD4hep/pull/872))
  - Allow for specifying MomentumMin and MomentumMax in Geant4IsotropeGenerator

* 2021-09-15 Markus Frank ([PR#871](https://github.com/aidasoft/DD4hep/pull/871))
  - Finalize CAD stuff.
  - Fix issue https://github.com/AIDASoft/DD4hep/issues/870

# v01-18

* 2021-09-07 Wouter Deconinck ([PR#869](https://github.com/aidasoft/DD4hep/pull/869))
  - Use G4OpticalParameters in geant4.10.7 and newer

* 2021-09-06 Andre Sailer ([PR#863](https://github.com/aidasoft/DD4hep/pull/863))
  - DDSim: add possibility for users to inject configurations for their own output plugins. See example in OutputConfig section of the steering file

* 2021-08-31 Markus Frank ([PR#867](https://github.com/aidasoft/DD4hep/pull/867))
  - Mainly update reference files for CAD shape tests, since the order of the vertices changed when adding facets
    with vertex indices rather than coordinates.

* 2021-08-30 Markus Frank ([PR#866](https://github.com/aidasoft/DD4hep/pull/866))
  - The export of beoolean shapes (union, subtraction, intersection) to was not properly working
    and actually casued segment vialotions. This PR fixes the problem and handles these shapes
    properly using the RootCsg operations for boolean shapes.
  - Examples geometries were provided by Gerri from FCC:  examples/ClientTests/compact/FCCmachine and files thereein.
  - Test example is in DDCAD:   DDCAD_export_FCC_machine and DDCAD_import_FCC_machine
  - This PR addresses the issues: https://github.com/AIDASoft/DD4hep/issues/813 , https://github.com/AIDASoft/DD4hep/issues/858

* 2021-08-25 Markus Frank ([PR#865](https://github.com/aidasoft/DD4hep/pull/865))
  - In cmake tests use the macro ${Python_EXECUTABLE} to invoke the python interpreter rather than
    only `python`.
  - if  `FIND_PACKAGE(Python ${REQUIRE_PYTHON_VERSION} EXACT QUIET COMPONENTS Interpreter)`
    does not resolve the python executable fall back to `python${Python_VERSION_MAJOR}`.

* 2021-08-24 Markus FRANK ([PR#864](https://github.com/aidasoft/DD4hep/pull/864))
  - Support for multiple readouts or (G4VUserParallelWorld equivalent)
    Issue https://github.com/AIDASoft/DD4hep/issues/861
    Example: 
    examples/CLICSiD/compact/SiD_ECAL_Parallel_Readout.xml + 
    examples/CLICSiD/scripts/SiD_ECAL_Parallel_Readout.py
  
    For a given subdetector the sequence of sensitive actions can be enhanced
    having multiple sensitive actions where each one can have its own Readout
    definition. Hence each action can produce its own set of hits depending on the
    readout geometry (segmentation).
    in XML these readout structures must first be defined:
  ```
    <readouts>
      <readout name="EcalBarrelHits">
        <segmentation type="CartesianGridXY" grid_size_x="3.5" grid_size_y="3.5" />
        <id>system:8,barrel:3,module:4,layer:6,slice:5,x:32:-16,y:-16</id>
      </readout>        
  
      <readout name="EcalBarrelHits_0">
        <segmentation type="CartesianGridXY" grid_size_x="1" grid_size_y="1" />
        <id>system:8,barrel:3,module:4,layer:6,slice:5,x:32:-16,y:-16</id>
      </readout>        
   ....
    </readouts>
  
  ```
  and can then be assigned to the sensitive actions in the python setup:
  ```  det = str('EcalBarrel')
    typ = sid.geant4.sensitive_types['calorimeter']
    seq = DDG4.SensitiveSequence(sid.kernel, str('Geant4SensDetActionSequence/') + det)
    seq.enableUI()
    act = DDG4.SensitiveAction(sid.kernel, str(typ + '/EcalBarrelHandler'), det)
    act.enableUI()
    seq.add(act)
    # Add extra parallel readout action with readout EcalBarrelHits_0
    act = DDG4.SensitiveAction(sid.kernel, str(typ + '/EcalBarrelHandler_0'), det)
    act.ReadoutName = 'EcalBarrelHits_0'
    act.enableUI()
    seq.add(act)
    # Add extra parallel readout action with readout EcalBarrelHits_1
    act = DDG4.SensitiveAction(sid.kernel, str(typ + '/EcalBarrelHandler_1'), det)
    act.ReadoutName = 'EcalBarrelHits_1'
  ...
  ```

* 2021-08-10 Wouter Deconinck ([PR#860](https://github.com/aidasoft/DD4hep/pull/860))
  - Optionally import gdml physvol below top level, avoiding world

* 2021-08-03 Valentin Volkl ([PR#855](https://github.com/aidasoft/DD4hep/pull/855))
  - [testing] separate import test for ddg4 and rest of dd4hep

* 2021-07-29 Markus FRANK ([PR#853](https://github.com/aidasoft/DD4hep/pull/853))
  - Implement fix as proposed in issue https://github.com/AIDASoft/DD4hep/issues/850.

* 2021-07-27 Whitney Armstrong ([PR#851](https://github.com/aidasoft/DD4hep/pull/851))
  - Using `ref="OtherVisName"` attribute with the `vis` tag, the visualization attribute is an extension of
  `"OtherVisName"` which is used to initialize the new vis attribute.
   - The new VisAttr inherits all the properties  of the ref and additional arguments override these values.
  
  Example where the only difference is the `alpha` value.
  
  ```
    <vis name="SiVertexBarrelModuleVis"
         alpha="1.0" r="1.0" g="0.75" b="0.76"
         drawingStyle="wireframe"
         showDaughters="false"
         visible="true"/>
  
    <vis name="SiVertexEndcapModuleVis"
         ref="SiVertexBarrelModuleVis"
         alpha="0.5"/>
  ```

* 2021-07-22 Whitney Armstrong ([PR#849](https://github.com/aidasoft/DD4hep/pull/849))
  - Fix G4Sphere construction to use delta theta/phi instead of TGeo's ending angles phi2/theta2.

* 2021-07-21 Placido Fernandez Declara ([PR#847](https://github.com/aidasoft/DD4hep/pull/847))
  - EDM4hepOutput: On collection creation for EDM4hep, save CellIDEncodingString

* 2021-06-24 Thomas Madlener ([PR#843](https://github.com/aidasoft/DD4hep/pull/843))
  - Explicitly enable `C` as language to avoid problems in the build file generation step of cmake (see spack/spack#24232)

# v01-17-00

* 2021-06-02 Andre Sailer ([PR#838](https://github.com/aidasoft/DD4hep/pull/838))
  - Geant4ShapeConverter: ExtrudedSolid: convert all vertices, fix #836, https://github.com/cms-sw/cmssw/issues/33656

* 2021-06-01 Marko Petric ([PR#840](https://github.com/aidasoft/DD4hep/pull/840))
  - Do not propagate CMAKE_BUILD_TYPE in DD4hepConfig.cmake

* 2021-05-27 Markus FRANK ([PR#835](https://github.com/aidasoft/DD4hep/pull/835))
  - On divisions the created solids did not carry the proper tag to identify them.
    This PR fixes this issue when multi-volumes are imported in dd4hep.
    See issue https://github.com/AIDASoft/DD4hep/issues/833

* 2021-05-17 Markus FRANK ([PR#829](https://github.com/aidasoft/DD4hep/pull/829))
  - Add missing Solid instantiation for TGeoCtub

* 2021-05-12 Andre Sailer ([PR#823](https://github.com/aidasoft/DD4hep/pull/823))
  - DDSim: add possibility for users to extend the physics setup with Physics.setupUserFunction

* 2021-05-07 Markus FRANK ([PR#825](https://github.com/aidasoft/DD4hep/pull/825))
  - Fix as reported from CMS

* 2021-05-01 Markus FRANK ([PR#821](https://github.com/aidasoft/DD4hep/pull/821))
  - Fix issue #820

* 2021-04-27 Andre Sailer ([PR#817](https://github.com/aidasoft/DD4hep/pull/817))
  - Move `create_segmentation` to DDCore/include/DD4hep/detail/SegmentationsInterna.h  to allow segmentation creation in other libraries
  - Removed REGISTER_SEGMENTATION macro and DDSegmentation::SegmentationFactory class because they are obsolete. Use DECLARE_SEGMENTATION to create a plugin entry for segmentations.

* 2021-04-24 Markus FRANK ([PR#816](https://github.com/aidasoft/DD4hep/pull/816))
  - Following requests, the support to output Volumes as CAD meshes.
    Depending on the underlying technology material names and visual attributes are supported
  - Improve CAD imports to take into account material names and visual attributes if supported
    by the underlying CAD format.
  - Add two examples showing the import and export technique.

* 2021-04-15 Markus FRANK ([PR#809](https://github.com/aidasoft/DD4hep/pull/809))
  - DDG4: Extend existing sensitive detectors to be used for GFlash parametrized fast simulations
  - DDG4: Remove legacy sensitive detectors, since they are no longer used by FCC

* 2021-04-15 Markus FRANK ([PR#808](https://github.com/aidasoft/DD4hep/pull/808))
  - Disable copy and move construction/assignment in Geant4 data
    See issue https://github.com/AIDASoft/DD4hep/issues/807
  - Adopt new naming convention for Geant4 assembly imprints
     See issue https://github.com/AIDASoft/DD4hep/issues/804
  - Add G4FastSimulationManagerProcess for GFlash

* 2021-04-12 Marko Petric ([PR#803](https://github.com/aidasoft/DD4hep/pull/803))
  - Fix bug in evaluator reported by Coverity

# v01-16-01

* 2021-03-26 Andre Sailer ([PR#799](https://github.com/AIDASoft/DD4hep/pull/799))
  - DDG4: flush the geant4 strstream buffer after run. fixes #798

* 2021-03-26 Marko Petric ([PR#793](https://github.com/AIDASoft/DD4hep/pull/793))
  - Account for possible units rounding bug in Tube creation (address #784 )

* 2021-03-23 Andre Sailer ([PR#797](https://github.com/AIDASoft/DD4hep/pull/797))
  - DDG4Dict: Adapt to changes in Root 6.24

* 2021-03-23 Andre Sailer ([PR#796](https://github.com/AIDASoft/DD4hep/pull/796))
  - RootDictionary: fix incompatibility with Root 6.24

* 2021-03-23 Andre Sailer ([PR#795](https://github.com/AIDASoft/DD4hep/pull/795))
  - Geant4Input: Add debug output for accepting or rejecting Particles

* 2021-03-14 Markus FRANK ([PR#794](https://github.com/AIDASoft/DD4hep/pull/794))
  - Address Coverity issues

* 2021-03-12 Marko Petric ([PR#792](https://github.com/AIDASoft/DD4hep/pull/792))
  - Use `CMAKE_SHARED_LIBRARY_SUFFIX` to define suffix of assimp libs
  - Define `BUILD_BYPRODUCTS` for compatibility with `ninja`

* 2021-03-12 Markus FRANK ([PR#791](https://github.com/AIDASoft/DD4hep/pull/791))
  - Remove a bunch of Coverity warnings.

* 2021-03-12 MarkusFrankATcernch ([PR#790](https://github.com/AIDASoft/DD4hep/pull/790))
  - update materialBudget utility
      -  allow to optionally use pseudo rapidity eta rather than polar angle

* 2021-03-12 Marko Petric ([PR#788](https://github.com/AIDASoft/DD4hep/pull/788))
  - Use flag `--as-needed` for GNU linkers

* 2021-03-11 Markus FRANK ([PR#789](https://github.com/AIDASoft/DD4hep/pull/789))
  - Fix several coverity warnings
  - Fix bug in extracting unsigned int/long from xml: conversion to unsigned values had a bug.
  - Remove unnecessary printout in Geant4Converter

# v01-16

* 2021-03-02 Markus FRANK ([PR#787](https://github.com/AIDASoft/DD4hep/pull/787))
  - Resolves #786. Also add an example to reproduce the Fix.
  - Add protection in Detector object against registering DetElements without placement
  - Modernize loop handling according to C++ 17 standards

* 2021-02-15 Andre Sailer ([PR#783](https://github.com/AIDASoft/DD4hep/pull/783))
  - Adapt to new ROOT mechanism for switching the unit system.
    Units can be switched now multiple times provided the units are unlocked in the TGeoManager.
    See TGeoManager::LockDefaultUnits(Bool_t new_value).
    This is only available for ROOT versions >= 6.22.08
  - Improve examples/Conditions. Allow for more complex dependencies. Not enabled by default.

* 2021-01-31 Markus FRANK ([PR#779](https://github.com/AIDASoft/DD4hep/pull/779))
  - Propagate changes in ComponentCast to the EDM module

* 2021-01-30 Markus FRANK ([PR#778](https://github.com/AIDASoft/DD4hep/pull/778))
  - Move the header DD4hep/detail/Grammar_parsed.h to DD4hep/GrammarParsed.h
  - Move the header DD4hep/detail/Grammar_unparsed.h to DD4hep/GrammarUnparsed.h
  - Try to improve type agnostic ABI cast. Works for down casts only.

* 2021-01-08 Markus FRANK ([PR#772](https://github.com/AIDASoft/DD4hep/pull/772))
  - This is the first release prepared to use Geant4 units (mm,ns,MeV). This compilation mode can be steered by a cmake flag: `-DDD4HEP_USE_GEANT4_UNITS=ON`. Once set, the flag is automatically propagated to depending projects in the generated `DD4hepConfig.cmake`. It programs TGeo to use the Geant4 units system. The unit system is applied also to depending quantities like interaction lengths etc.
  - Update some tests and ensure compatibility in the checks/reference files for both unit system. There is one caveat: Mesh-creation of shapes depends to some degree on the unit system, because mesh points are  removed depending on a tolerance value which is the same for both systems.
  - A fix had to be applied to propagate the flag `DD4HEP_BUILD_DEBUG` to depending projects.  This flag affects some object layouts and hence MUST be applied also to depending projects.
  - Remove inclusions of `Plugins.h` from being processed by rootcling. Plugins.h uses `#include <any>`, which cannot be processed.

* 2020-12-18 Marko Petric ([PR#771](https://github.com/AIDASoft/DD4hep/pull/771))
  - Expand list of cmake versions that have bug in detecting python version  (see AIDASoft/podio#162)

# v01-15

* 2020-12-08 Frank Gaede ([PR#740](https://github.com/AIDASoft/DD4hep/pull/740))
  - add back the  Geant4Output2EDM4hep plugin from EDM4hep
       - use optional flag `D4HEP_USE_EDM4HEP` to build this
       - requires podio and EDM4hep to be present
  - fix treatment of units in Geant4Output2EDM4hep
  - DDTest: add optional ddsim tests with edm4hep and lcio output (A.Sailer)
  - enable `D4HEP_USE_EDM4HEP` in CI for dev (A.Sailer)

* 2020-12-07 Christopher Jones ([PR#767](https://github.com/AIDASoft/DD4hep/pull/767))
  - Made internal classes used by Evaluator to be less stateful
  - Switch to using a read/write lock as modifications to the Evaluator are much less frequent than reads.
  - Added unit test for Evaluator

* 2020-12-04 Andre Sailer ([PR#766](https://github.com/AIDASoft/DD4hep/pull/766))
  - DDG4: hepmc3reader: add checks for read and skip success
  - DDTest: test hepmc3 reader, make lcio and hepmc3 reader tests depend on configuration.

* 2020-12-04 Andre Sailer ([PR#765](https://github.com/AIDASoft/DD4hep/pull/765))
  - DDG4: Geant4InputHandling: create particle with 4 vector (vecP, E), solves issue where the dynamic mass differs from the PDG mass (e.g., via particle.tbl / extraParticles), #760

* 2020-12-03 MarkusFrankATcernch ([PR#753](https://github.com/AIDASoft/DD4hep/pull/753))
  - Always use `CLHEP/Units/SystemOfUnits.h` and never `G4SystemOfUnits.hh`
    -  in `G4SystemOfUnits.hh`units are directly in the top level namespace
    - in `CLHEP/Units/SystemOfUnits.h` units are in the `CLHEP::` namespace
  - Remove all usage `using namespace CLHEP` and `using CLHEP::__some_unit__` to clarify which unit is used

* 2020-12-02 MarkusFrankATcernch ([PR#764](https://github.com/AIDASoft/DD4hep/pull/764))
  - Make scaled shapes includes conditional on Geant4 version (>=10.3)
  - Improve thread safety of expression evaluator

* 2020-12-02 Andre Sailer ([PR#754](https://github.com/AIDASoft/DD4hep/pull/754))
  - ddsim: fix problem with `--dumpSteeringFile` in python3
  - ddsim: fix issue in where isotrop was False, when distribution was set (python3)
  - ddsim: fix exception in exceptions for gun direction and position
  - ddsim: fix problem where `hepmc.useHepMC3` was always True by default
  - PluginManager: rename the listcomponents executable to listcomponents_dd4hep, to avoid clash with the Gaudi listcomponents. This is transparent for users of the dd4hep_add_plugin cmake macro.
  - DDG4Dict: remove `dd4hep::sim::Geant4InputAction::Particles;` as this is available under a different name, fixes warning
  - CMake: DD4hepConfig.cmake: use find_dependency with CONFIG for Geant4, TBB, ROOT, LCIO, and if needed CLHEP, to avoid accidental use of `Find<PACKAGE>.cmake` modules

* 2020-11-24 MarkusFrankATcernch ([PR#757](https://github.com/AIDASoft/DD4hep/pull/757))
  - Expression evaluation was not protected against race conditions when executing in multiple threads. We lock now the evaluation namespace with an associated lock when evaluating expression statements. Each evaluation call is wrapped and protected. This should ensure thread safety.

* 2020-11-24 Marko Petric ([PR#751](https://github.com/AIDASoft/DD4hep/pull/751))
  - Resolve which type of linker is used and assign proper linking flags

* 2020-11-21 Markus FRANK ([PR#756](https://github.com/AIDASoft/DD4hep/pull/756))
  - Remove from Geant4 conversion of scaled shapes artifacts of the prior implementation of reflections.
    This was a wrong implementation and should now be fixed.
    This PR should fix issue https://github.com/AIDASoft/DD4hep/issues/750
  - Introduce the Scale (based on TGeoScaledShape) as a separate shape om DD4hep.
  - Add test for scaled shape

* 2020-11-19 Marko Petric ([PR#749](https://github.com/AIDASoft/DD4hep/pull/749))
  - Add explanation of the system of units to the user manual

* 2020-11-19 MarkusFrankATcernch ([PR#748](https://github.com/AIDASoft/DD4hep/pull/748))
  - Review documentation
    o Add chapter to describe MC truth handling for DDG4
    o Review shape and shape plugin section in the DD4hep manual
  - Adapt ConeSegment shape plugin to allow for standard syntax
  - Fix Torus shape plugin and test 
  - Add copyright notice to various test files

* 2020-11-19 Ole Hansen ([PR#745](https://github.com/AIDASoft/DD4hep/pull/745))
  - Improve path handling in setup scripts, by avoiding duplicates in paths. Also support whitespaces in paths and don't add system paths to library paths on macOS

* 2020-11-19 Ole Hansen ([PR#743](https://github.com/AIDASoft/DD4hep/pull/743))
  - Fix compilation warnings from Apple Clang 12
  - Fix broken `t_CLICSiD_DDG4_g4geometry_scan_LONGTEST` test condition which always matched.

* 2020-11-18 Ole Hansen ([PR#744](https://github.com/AIDASoft/DD4hep/pull/744))
  - CMake: Fix regression that examples and example tests can now be built and run together with the main project

* 2020-11-16 Markus FRANK ([PR#747](https://github.com/AIDASoft/DD4hep/pull/747))
  - Add documentation of DDG4 Monte-Carlo truth handler
  - Add documentation of DDG4 ROOT output module

* 2020-11-13 Markus FRANK ([PR#742](https://github.com/AIDASoft/DD4hep/pull/742))
  - Add example for CMS CSC: tests divisions
  - Add example for CMS ECAL: tests reflections
  - Improve DDG4_MySensDet: Example illustrating how to have customized sensitive detectors and user defined hit classes with data saved to ROOT. Example corresponding to question raised in https://github.com/AIDASoft/DD4hep/issues/703
  The example also includes a small script to read back the data generated with this example:
  Command line usage:
     *  $> root.exe
     *  ....
     *  root [0] gSystem->Load("libDDG4Plugins.so");
     *  root [1] gSystem->Load("libDDG4_MySensDet.so");
     *  root [2] SomeExperiment::Dump::dumpData(<num-ebents>,<file-name>);
  
  - Remove the odd shadowing warning.
  - Improve visualization attributes:
    As reported by Sanhyung Ko (https://indico.cern.ch/event/967418/contributions/4075358/attachments/2128099/3583278/201009_shKo_dd4hep.pdf) the application of visual attributes to volumes was very resource intensive. 
    This should be fixed by asking for the transparent color only once at the level of the attribute rather then for each volume.

* 2020-11-11 Frank Gaede ([PR#738](https://github.com/AIDASoft/DD4hep/pull/738))
  - fix units in DDG4/LCIO conversions  
       - prepend namespace CLHEP where missing

* 2020-11-10 Markus FRANK ([PR#736](https://github.com/AIDASoft/DD4hep/pull/736))
  - Update DDCMS example to take into account new xml tags.
  - Improve some core object helpers

* 2020-11-06 Markus FRANK ([PR#734](https://github.com/AIDASoft/DD4hep/pull/734))
  - No new implementation for reflections. Still uses TGeo way with scaled shape.
    This implementation is not supposed to be used.
  - Added test to debug reflections

* 2020-11-05 Ianna Osborne ([PR#732](https://github.com/AIDASoft/DD4hep/pull/732))
  - Examples.DDCMS: add CMS EcalEndcap description to test reflected volumes

* 2020-11-03 Andre Sailer ([PR#731](https://github.com/AIDASoft/DD4hep/pull/731))
  - Tests: Always run AClick tests sequentially, fixes #730

* 2020-11-03 Andre Sailer ([PR#728](https://github.com/AIDASoft/DD4hep/pull/728))
  * CMake: fix python version compatibility check between python and root used for python. Add exception for CMake 3.17.1
  * Tests: fix some test configuration to run all tests after `-D DD4HEP_BUILD_EXAMPLES=ON`
  * Tests: fix tests for root 6.22.04 and master

* 2020-11-02 Andre Sailer ([PR#725](https://github.com/AIDASoft/DD4hep/pull/725))
  -  CMake: fail if ROOT and DD4hep python disagree

* 2020-10-14 Ianna Osborne ([PR#723](https://github.com/AIDASoft/DD4hep/pull/723))
  - SpecParRegistry: remove need for TBB
    - TBB has a slight overhead compare to std containers
    - Using std containers allows to return references to the containers in the registry
  
  - Reverse the plan to process XML files in parallel

# v01-14-01

* 2020-10-02 Markus Frank ([PR#720](https://github.com/AIDASoft/DD4hep/pull/720))
  - Add the ability to access the `DetElement` in a derived condition. Access to it is enabled now for all
  compilations (Debug + Release).
  - When parsing compact, it is possible to inject plugins to create tables with tabulated properties in C++
  - When parsing compact, it is possible to inject plugins to assign property tables to materials.

* 2020-09-28 Marko Petric ([PR#718](https://github.com/AIDASoft/DD4hep/pull/718))
  - Replace deprecated `PyOS_AfterFork` with `PyOS_AfterFork_Child` for python 3.7 and above

# v01-14

* 2020-09-26 Markus Frank ([PR#717](https://github.com/aidasoft/dd4hep/pull/717))
  - Propagate condition names for printouts. Names are enabled by default. The feature can be disabled
    to minimize conditions memory footprint. Comment `DD4HEP_CONDITIONS_HAVE_NAME` in `DD4hep/config.h`
  
  - If the debug flag `DD4HEP_CONDITIONS_DEBUG` is set (enabled by the compile definition `DD4HEP_DEBUG`, which in turn is enabled by the cmake flag `DD4HEP_BUILD_DEBUG`, which is turned on in debug builds automatically), then condition objects offer optional storage e.g. to store the object address or an xml-string etc.
  
  - Update and fix some tests, which were assuming names

* 2020-09-25 Marko Petric ([PR#715](https://github.com/aidasoft/dd4hep/pull/715))
  - Rename `TruncatedTube` `zHalf` accessor with `dZ` resolves #714 
  - Add to `Trap` missing `dZ` accessor resolves #713

* 2020-09-23 Andre Sailer ([PR#712](https://github.com/aidasoft/dd4hep/pull/712))
  - Cmake: add configuration option DD4HEP_BUILD_DEBUG, if ON or OFF enable or disable the DD4HEP_DEBUG definition
  if not set, enable if BuildType is Debug, fixes #708

* 2020-09-23 bcouturi ([PR#709](https://github.com/aidasoft/dd4hep/pull/709))
  - Added geoWebDisplay command that uses jsroot to render the Geometry, requires ROOT7 ROOTEve

* 2020-09-23 Andre Sailer ([PR#707](https://github.com/aidasoft/dd4hep/pull/707))
  - DDG4.HepEvtReader: fix reading of input particles, fixes #706 
  - DDG4.HepEvtReader: fix the units, expecting GeV, mm as units of input files.
  - DDG4.HepEvtReader: add abort if the file cannot be read, e.g., when the content doesn't match what is expected

* 2020-09-22 Marko Petric ([PR#710](https://github.com/aidasoft/dd4hep/pull/710))
  -  Fix variable name`SIGNATURE` in `Plugins.h` and `Plugins.inl` that conflicts with `#define` from `utmpx.h` in macOS libc implementation. Resolves #700
  - Migrate CI from Travis-CI to GitHub Actions and include macOS and ubuntu18 tests

* 2020-09-17 Marko Petric ([PR#704](https://github.com/aidasoft/dd4hep/pull/704))
  - Apply `clang-tidy` `llvm-header-guard` fixer

* 2020-09-16 Andre Sailer ([PR#705](https://github.com/aidasoft/dd4hep/pull/705))
  - DDSim: add options to select which sensitive detectors are trackers and calorimeters, defaults unchanged
  - DDSim: tweak log output formatting, logging goes now to stdout instead of stderr
  - SiD example: remove `track_length_max` and `time_max` from silicon limits (fixes part of #703 )

* 2020-09-07 Markus Frank ([PR#702](https://github.com/aidasoft/dd4hep/pull/702))
  - Add `starttheta`, `endtheta`, `endphi` xml accessors. 
  - Fix sphere shape creator and update shape example.

* 2020-09-04 Markus Frank ([PR#697](https://github.com/aidasoft/dd4hep/pull/697))
  - Implement data member accessors for construction parameters in `Shapes.h`. As discussed in the thread cms-sw/cmssw#30931 it was felt that read-only access to the basic construction parameters of a shape would be highly useful.

* 2020-09-03 Marko Petric ([PR#699](https://github.com/aidasoft/dd4hep/pull/699))
  - Set search order for python on macOS to search for system/framework python last (change in behavior of cmake 3.14->3.15)

* 2020-07-31 Markus Frank ([PR#692](https://github.com/aidasoft/dd4hep/pull/692))
  - Protect XML file handling against non-existing files.

* 2020-07-30 Markus Frank ([PR#691](https://github.com/aidasoft/dd4hep/pull/691))
  - Improve matrix helpers: Add extractors for scale and translation as `XYZVector` from `TGeoMatrix`.
  - Add example to simulate the MiniTel with DDG4 using a HepMC input file
  - Add example to load a sub-detector geometry from gdml.

* 2020-07-27 Markus Frank ([PR#690](https://github.com/aidasoft/dd4hep/pull/690))
  1) New example to show the usage of multiple compact input files being processed from the command line.
      The example illustrates how to maniplulate the opening and the closing of the geometry using the compact notation.
      ```
       geoDisplay  -input file:SiD_multiple_inputs.xml \
                           -input file:SiD_detectors_1.xml \
                           -input file:SiD_detectors_2.xml \
                           -input file:SiD_close.xml \
                           -print INFO -destroy -volmgr -load```
  2) New example to scan the geometry starting from a given position in a certain direction. Command line like for g4MaterialScan.
      The output shows then the pathes to the volumes traversed, the shape and the material of these volumes.
  
      `g4GeometryScan --compact=DDDetectors/compact/SiD.xml --position=0,0,0 --direction=0,1,0`
  
     Resulting output:
     ```
      GeometryScan                      WARN  Starting tracking action for track ID=1
      +--------------------------------------------------------------------------------------------------------------------------------------------------
      | Material scan between: x_0 = (   0.00,   0.00,   0.00) [cm] and x_1 = (   0.00,3000.00,   0.00) [cm]  TrackID:1: 
      +--------------------------------------------------------------------------------------------------------------------------------------------------
      |     \                Path                                        
      | Num. \  Thickness    Length   Endpoint                   Volume , Shape , Material
      | Layer \   [cm]        [cm]    (     cm,     cm,     cm)         
      +--------------------------------------------------------------------------------------------------------------------------------------------------
      |     1      2.4500     2.450   (   0.00,   2.45,   0.00)  Path:"/world/BeamPipeVacuum_62" Shape:G4Polycone  Mat:Vacuum
      |     2      0.0500     2.500   (   0.00,   2.50,   0.00)  Path:"/world/Beampipe_53" Shape:G4Polycone  Mat:Beryllium
      |     3      0.1802     2.680   (   0.00,   2.68,   0.00)  Path:"/world/av_3_impr_1_layer1_pv_0" Shape:G4Tubs  Mat:Air
      |     4      0.0115     2.692   (   0.00,   2.69,   0.00)  Path:"/world/av_3_impr_1_layer1_pv_0/VtxBarrelModuleInner_4" Shape:G4Box  Mat:Air
      |     5      0.0130     2.705   (   0.00,   2.70,   0.00)  Path:"/world/av_3_impr_1_layer1_pv_0/VtxBarrelModuleInner_4/component0_0" Shape:G4Box  Mat:Carbon
      |     6      0.0256     2.730   (   0.00,   2.73,   0.00)  Path:"/world/av_3_impr_1_layer1_pv_0/VtxBarrelModuleInner_4" Shape:G4Box  Mat:Air
      |     7      0.0050     2.735   (   0.00,   2.74,   0.00)  Path:"/world/av_3_impr_1_layer1_pv_0/VtxBarrelModuleInner_4/component1_1" Shape:G4Box  Mat:Silicon
      |     8      0.0050     2.740   (   0.00,   2.74,   0.00)  Path:"/world/av_3_impr_1_layer1_pv_0/VtxBarrelModuleInner_4" Shape:G4Box  Mat:Air
      |     9      0.1596     2.900   (   0.00,   2.90,   0.00)  Path:"/world/av_3_impr_1_layer1_pv_0" Shape:G4Tubs  Mat:Air
      |    10      0.7000     3.600   (   0.00,   3.60,   0.00)  Path:"/world" Shape:G4Box  Mat:Air
      |    11      0.1844     3.784   (   0.00,   3.78,   0.00)  Path:"/world/av_3_impr_1_layer2_pv_1" Shape:G4Tubs  Mat:Air
      |    12      0.0115     3.796   (   0.00,   3.80,   0.00)  Path:"/world/av_3_impr_1_layer2_pv_1/VtxBarrelModuleOuter_4" Shape:G4Box  Mat:Air
      ....
     ```

# v01-13-01

* 2020-07-10 Markus Frank ([PR#686](https://github.com/AIDASoft/DD4hep/pull/686))
  - Fix bug in `VolumeBuilder` where `VolIDs` were not properly set to physical volumes if the `xml` supported an `id` tag.

# v01-13

* 2020-07-02 MarkusFrankATcernch ([PR#684](https://github.com/AIDASoft/DD4hep/pull/684))
  - Fix compiler issue for clang 3.9 (resolves #683)

* 2020-07-02 Andre Sailer ([PR#682](https://github.com/AIDASoft/DD4hep/pull/682))
  - CMake: add option `DD4HEP_USE_TBB` to require TBB or not
  - `Filter` and `SpecParRegistry` classes from CMSSW (see #675)

* 2020-07-01 vvolkl ([PR#679](https://github.com/AIDASoft/DD4hep/pull/679))
  - Add CPack Configuration

* 2020-06-30 Markus Frank ([PR#680](https://github.com/AIDASoft/DD4hep/pull/680))
  - adopt IOV changes from @pikacic to work on macOS (see #678).

* 2020-06-30 Marco Clemencic ([PR#678](https://github.com/AIDASoft/DD4hep/pull/678))
  - Modernization and clean up of `dd4hep::IOV` (`using` instead of `typedef`, `constexpr` instead of `enum`)
  - Make `dd4hep::IOV::Key` uniform wrt first and second type
  - Use `std::int64_t`instead of `long` for `dd4hep::IOV::Key` elements

* 2020-06-18 lintao ([PR#677](https://github.com/AIDASoft/DD4hep/pull/677))
  - Fixed the `CLHEP::mm` to `dd4hep::mm` conversion problem in `DDG4/src/Geant4SensitiveDetector.cpp`

* 2020-06-11 Markus FRANK ([PR#676](https://github.com/AIDASoft/DD4hep/pull/676))
  - Fix problem with missing header in DDEve appearing in ROOT head.

* 2020-06-08 Marko Petric ([PR#673](https://github.com/AIDASoft/DD4hep/pull/673))
  - Use unique include guard in `BitFieldCoder.h`
    - fix ambiguity in test between `BitField64` in LCIO and DD4hep
  - Cast to string `coll_nam` in `DDG4.py` before using further, otherwise string concatenation does not work

* 2020-05-29 Andre Sailer ([PR#672](https://github.com/AIDASoft/DD4hep/pull/672))
  - Use unique include guards

* 2020-04-24 Frank Gaede ([PR#663](https://github.com/AIDASoft/DD4hep/pull/663))
  - fix compilation of `DigiKernel.cpp` with TBB

* 2020-04-09 Andre Sailer ([PR#660](https://github.com/AIDASoft/DD4hep/pull/660))
  - DDG4: fix behaviour of ParticleRejectFilter and ParticleSelectFilter, They now properly select or reject the given particle type, instead of the opposite. Fixes #657

* 2020-04-09 Markus FRANK ([PR#659](https://github.com/AIDASoft/DD4hep/pull/659))
  - Allow condition objects, which do not provide a default constructor. If such objects should be managed, these cannot be saved with ROOT - these objects may only live in memory. ROOT requires a default constructor.

* 2020-04-09 Marko Petric ([PR#654](https://github.com/AIDASoft/DD4hep/pull/654))
  - Rewrite rpath usage on macOS and make it relocatable with help of `@rpath`
    - itroduce new option `DD4HEP_SET_RPATH` default `ON`
  - adopt `thisdd4hep.sh` and other `.sh` scripts to work with zsh (new default for macOS 10.15)
  - Drop `MakeGaudiMap.cmake` and call directly `listcomponents`
    - fix env settings for macOS
  - Drop deprecated `-std=` flag in dictionary creation

* 2020-03-23 Andre Sailer ([PR#652](https://github.com/AIDASoft/DD4hep/pull/652))
  - Documentation: fix broken mathml, fixes #651

* 2020-03-20 Andre Sailer ([PR#649](https://github.com/AIDASoft/DD4hep/pull/649))
  - CMake: add `DD4HEP_HIGH_MEM_POOL_DEPTH` option. Allow setting of parallel builds of DDParser objects with the ninja generator. Defaults to "memory / 2000 cores (rounded down)"

* 2020-03-20 Andre Sailer ([PR#632](https://github.com/AIDASoft/DD4hep/pull/632))
  - CMake:  Adapt to ROOT 6.22 python library ROOTTPython

* 2020-03-18 Andre Sailer ([PR#636](https://github.com/AIDASoft/DD4hep/pull/636))
  - DDG4: add reader for HepMC3 files
  - DDG4: add generic EventParameters class to pass event level parameters from different input sources to different output sources, supercedes the LCIOEventParameters class

* 2020-03-11 Markus Frank ([PR#647](https://github.com/AIDASoft/DD4hep/pull/647))
  - The CAD volume plugin allows to embed valumes and shapes originating from Computer Aided Design drawings using multiple formats as they are supported by the open asset importer library (http://assimp.org ). The plugin can be used whenever the `xml` fragment matches the following pattern:
      ```xml
      <XXX ref="file-name"  material="material-name">   
        <material name="material-name"/>  <!-- alternative: child or attr -->
   
        Envelope:  Use special envelop shape (default: assembly)
                   The envelope tag must match the expected pattern of the utility
                   dd4hep::xml::createStdVolume(Detector& desc, xml::Element e)
        <envelope name="volume-name" material="material-name">
          <shape name="shape-name" type="shape-type" args....>
          </shape>
        </envelope>
   
        Option 1:  No additional children. use default material 
                   and place all children in the origin of the envelope
   
        Option 2:  Volume with default material
        <volume name="vol-name"/>
   
        Option 3:  Volume with non-default material
        <volume name="vol-name" material="material-name"/>
   
        Option 4:  Volume with optional placement. No position = (0,0,0), No rotation = (0,0,0)
        <volume name="vol-name" material="material-name"/>
          <position x="0" y="0" z="5*cm"/>
          <rotation x="0" y="0" z="0.5*pi*rad"/>
        </volume>
   
        For sensitive volumes: add physical volume IDs:
        <volume name="vol-name" material="material-name"/>
          <physvolid name="layer" value="1"/>
          <physvolid name="slice" value="10"/>
        </volume>
       </XXX>
       ```

# v01-12-01

* 2020-03-03 Marko Petric ([PR#641](https://github.com/AIDASoft/DD4hep/pull/641))
  - DDSim: make the output of `ddsim --dumpSteeringFile` visible again
  - DDSim: fix exception in ConfigHelper.printOptions, called by `--dumpParameters` option
  - DDSim: fix parsing of vector command line parameters, gun.position, gun.direction etc.
  - DDSim: better testing of command line parameters

* 2020-03-03 vvolkl ([PR#640](https://github.com/AIDASoft/DD4hep/pull/640))
  - DDSim: add option to use edm4hep output

# v01-12

* 2020-02-26 Andre Sailer ([PR#637](https://github.com/aidasoft/dd4hep/pull/637))
  - LcioEventReader: fix setting of color flow, second coordinate was never set

* 2020-02-25 Markus Frank ([PR#633](https://github.com/aidasoft/dd4hep/pull/633))
  - Added basic implementation for CAD interface to load shapes from CAD files. There is an open issue how to best embed the volume/shape loading from CAD files into the existing infrastructure. See for [presentation](https://indico.cern.ch/event/885083/contributions/3758180/attachments/1990793/3318984/2020-02-20-DD4hep-Tessellated-Shapes.pdf). This feature is only available if build against ROOT 6.22 or higher. 
  - DDCAD used the [assimp](https://github.com/assimp/assimp) librray to interprete the CAD files.
  - Simplify grammar instantiation. 
    - For grammars to be parsed with `boost::spirit` simply include
      `#include "DD4hep/detail/Grammar_parsed.h"`
    - For Grammars which should **not be parsed** with `boost::spirit` include
      `#include "DD4hep/detail/Grammar_unparsed.h"`
    - To instantiate the code and to register the instantiation call:
       `template <> dd4hep::Grammar<my-class>;`
    - If the Grammar is supposed to be registered call instead/in addition:
      `static auto s_registry = GrammarRegistry::pre_note<my-class>();`
     - All other macros are gone.

* 2020-02-21 Andre Sailer ([PR#631](https://github.com/aidasoft/dd4hep/pull/631))
  - Only build DDG4 Python dependent libraries and pcms if Python and PyROOT are found

* 2020-02-21 Andre Sailer ([PR#627](https://github.com/aidasoft/dd4hep/pull/627))
  - MakeGaudiMap: better inference of listcomponents and library location by using target properties
  - MakeGauiMap: Detailed information about the command is not only printed when VERBOSE=1

* 2020-02-19 Marko Petric ([PR#626](https://github.com/aidasoft/dd4hep/pull/626))
  - Check in python modules that load `libglapi` is only called if the library is not already loaded.

* 2020-02-19 Sebastien Ponce ([PR#624](https://github.com/aidasoft/dd4hep/pull/624))
  - Fixed bug in the `dd4hep_add_test_reg` function which was only taking into account the last dependency of a test when several were present.

* 2020-02-19 Marko Petric ([PR#622](https://github.com/aidasoft/dd4hep/pull/622))
  - Add missing conversion from `unicode` to `str` for python 2 case in `DDrec.py`
  - Add test to check dd4hep python module imports
  - Fixes for tests from examples:
     - typo in tessellated example
     - make gdml read test dependent on the gdml write test
  - Add check to test if the version of python used to build ROOT is the same to the version detected by CMake to build DD4hep (works only from ROOT 6.20)

* 2020-02-17 Andre Sailer ([PR#621](https://github.com/aidasoft/dd4hep/pull/621))
  - Cmake: dd4hep_add_dictionary: directly use command, no longer created bash script to be called. See details of call with `make VERBOSE=1`
  - PluginServiceV2: use `boost::split` instead of walking of char arrays, fix bug when two colons are in the environment variable. Fixes #600

* 2020-02-13 Sebastien Ponce ([PR#620](https://github.com/aidasoft/dd4hep/pull/620))
  - added missing dependency of Persist_CLICSiD_Geant4 test on Persist_CLICSiD_Save_LONGTEST

* 2020-02-11 Marko Petric ([PR#618](https://github.com/aidasoft/dd4hep/pull/618))
  - Fix from which version of ROOT `TGeoTessellated` is supported (starting only in 6.22)
  - Fix location of test file in tessellated example

* 2020-02-06 Hadrien Grasland ([PR#613](https://github.com/aidasoft/dd4hep/pull/613))
  - Use the official CMake configuration mechanism provided by TBB >= 2017 U7.
  - Do not delete move constructors in DigiKernel as this breaks current versions of TBB.

* 2020-02-05 Markus Frank ([PR#610](https://github.com/aidasoft/dd4hep/pull/610))
  - Thanks to @agheata, ROOT now supports tessellated shapes. These new shapes are now supported by DD4hep including the automatic translation to Geant4. The tessellated shapes feature is only supported when compiling against ROOT 6.20.0 or higher.
  - Added a basic shape test for the tessellated shape.

* 2020-02-03 Markus Frank ([PR#608](https://github.com/aidasoft/dd4hep/pull/608))
  - SInce we do not use DTD checking all DTD links from lcdd xml files have been removed in examples. 
  - Add 2 examples to check the usage of NTP and STP temperature/pressure conditions

* 2020-01-09 Markus Frank ([PR#606](https://github.com/aidasoft/dd4hep/pull/606))
  - Resolves #605 
  - There was an apparent bug when cloning `DetElement` trees. Not only for the top element, which should receive a new ID, this top ID was propagated to all children. This was clearly wrong. The correct solution is: 
      - Top element gets a new ID
      - Children keep their ID
  - If a user wants to preserve the old functionality the flag `DetElement::PROPAGATE_PARENT_ID` must be set in the clone statement.

* 2019-12-18 Markus Frank ([PR#604](https://github.com/aidasoft/dd4hep/pull/604))
  - Allow to set ambient temperature and pressure for all materials. 
      - predefined settings: STP, NTP
      - Example:
         - `examples/ClientTests/compact/Check_Air.xml`
       - Apply global temperature and pressure for all materials and especially for one single material.
       - Verification for Geant4: `examples/ClientTests/scripts/Check_Air.py`
  - DDG4: allow Geant4 messengers to pass parameter string.

* 2019-12-16 Markus Frank ([PR#603](https://github.com/aidasoft/dd4hep/pull/603))
  - Resolves #599
  - Resolves #601 
  - Work on #595

* 2019-11-27 Markus Frank ([PR#597](https://github.com/aidasoft/dd4hep/pull/597))
  - Intermediate release to store improvements in the development of DDDigi:
    Start implementing noise chains
  - Fix cmake build if CLHEP is included in Geant4 and not external.

* 2019-11-16 Markus Frank ([PR#596](https://github.com/aidasoft/dd4hep/pull/596))
  - Requre that all materials must be entered explicitly.
    - The default ROOT element table is disabled. 
  - Fix examples, which relied on the default ROOT elements being present
  - Fix #595 for DDCMS:
    - The density was not re-normalized to the units TGeo was expecting. Same for atomic weights.
    - Fill missing elements to `DDCMS/data/materials.xml` (Values to be cross-checked by CMS)

* 2019-11-09 Markus Frank ([PR#593](https://github.com/aidasoft/dd4hep/pull/593))
  -  Fix Geant4 conversion for Polyhedra and Polycone if start_phi != 0 (See issue https://github.com/AIDASoft/DD4hep/issues/578)
  - Preparatory work to have placeholder volumes for twisted tubes (See issue https://github.com/AIDASoft/DD4hep/issues/588)

* 2019-10-29 Andre Sailer ([PR#590](https://github.com/aidasoft/dd4hep/pull/590))
  - DumpBField: correct the column unit printout and prepare for eventual change of default length unit
  - MagneticFields example: correct the unit for the Z parameter of the MultiPole to tesla

# v01-11-01
* patch release for v01-11 that adds this PR to v01-11:
* 2020-02-26 Andre Sailer (PR#637)
   - LcioEventReader: fix setting of color flow, second coordinate was never set

# v01-11

* 2019-10-23 MarkusFrankATcernch ([PR#587](https://github.com/AidaSoft/DD4hep/pull/587))
  -  Have separate compilation unit for shape utilities like `set_dimension(...)`, `dimension()`, `isA()`, `instanceOf()`... 
  - Improvements to basic shape test

* 2019-10-23 Andre Sailer ([PR#579](https://github.com/AidaSoft/DD4hep/pull/579))
  - CMake: Add possibility to build only shared libraries, fixes #493: 
    - Usage `cmake ... -D BUILD_SHARED_LIBS=OFF ...`

* 2019-10-23 Andre Sailer ([PR#575](https://github.com/AidaSoft/DD4hep/pull/575))
  * CMake: Add `DD4HEP_USE_EXISTING_DD4HEP` option which together with `DD4HEP_BUILD_PACKAGES` can be used to rebuild, for example only DDG4.
     * This creates a new Package called "DD4hepSelected" which can then be used alongside the full DD4hep Package in a third project.

* 2019-10-22 Marko Petric ([PR#586](https://github.com/AidaSoft/DD4hep/pull/586))
  - Remove deprecated rootcling flags (`-cint`, `-c`, `-p`, `-std=c++`) from dictionary creation script

* 2019-10-22 Marko Petric ([PR#585](https://github.com/AidaSoft/DD4hep/pull/585))
  - Fix bug that the c++ filesystem check is called from `${DD4hep_ROOT}`
  - Install `DD4hepConfig.cmake` only in `__prefix__/cmake` to avoid path detection confusion
  - Enable choosing examples in the `examples/CMakeLists.cmake` via cmake flag `-DDD4HEP_BUILD_EXAMPLES=OpticalSurfaces` (recommended method)
  - Make each example folder to compile standalone (not recommended method)
  - Update cmake of Segmentation example to more current state and fix resulting errors
    - include segmentation example as test
  - Resolves #582 and resolves #583

* 2019-10-21 MarkusFrankATcernch ([PR#584](https://github.com/AidaSoft/DD4hep/pull/584))
  - Add function `bool isInstance(const Handle<TGeoShape>& solid)`
     - compares types of shapes and behaves like `dynamic_cast`, similar to python's `isinstance(obj,type)`
     - remove deprecated function `instanceOf` in favour of `isInstance`. Same behavior.
   - Add function `bool isA(const Handle<TGeoShape>& solid)`
     - compares types of shapes and requires exact match, no polymorphism allowed.
  - Add Geant4 conversion for shape `TGeoCtub` -> `G4CutTube`

* 2019-10-14 Marko Petric ([PR#572](https://github.com/AidaSoft/DD4hep/pull/572))
  - Install python files in `lib/pythonX.Y/site-packages` resolves #562 
    - adapt `thisdd4hep.sh` scripts
  - Add missing RPATH to examples (basically bug fix for mac)
  - Add DDG4 tools to bin to make them more accessible to users:
    - `g4MaterialScan`, `checkGeometry`, `checkOverlaps`

* 2019-10-03 MarkusFrankATcernch ([PR#577](https://github.com/AidaSoft/DD4hep/pull/577))
  - Inhibit not allowed use of `DetectorImp.h`

* 2019-10-03 Andre Sailer ([PR#574](https://github.com/AidaSoft/DD4hep/pull/574))
  - CMake: When needing `boost::filesystem` (c++14, gcc  < 8) require at least Boost 1.56, see #567

* 2019-10-03 Markus Frank ([PR#573](https://github.com/AidaSoft/DD4hep/pull/573))
  - Fix memory leak introduced when generalizing placements to include left-handed coordinate systems.

* 2019-10-03 Markus Frank ([PR#571](https://github.com/AidaSoft/DD4hep/pull/571))
  - Add example to the volume reflection mechanism
  - Fix bug in volume reflection

* 2019-10-02 Markus Frank ([PR#569](https://github.com/AidaSoft/DD4hep/pull/569))
  - First implementation to support reflection with left-handed volumes/solids
    - Changes for volumes and solids.
    - Conversion handling of `TGeoScaledShape` in DDG4

* 2019-09-30 Andre Sailer ([PR#566](https://github.com/AidaSoft/DD4hep/pull/566))
  - PythonBindings: fix issue when source files were not available, fixes #565 
  - CMake: drop DDCores dependency on DD4hepGaudiPluginMgr
  - CMake: DD4hepConfig: use find_dependency instead of find_package

* 2019-09-24 Marko Petric ([PR#564](https://github.com/AidaSoft/DD4hep/pull/564))
  - Added test for Python3 compliance of code
  - Added test to require flake8 python code formatting

* 2019-09-13 Marko Petric ([PR#540](https://github.com/AidaSoft/DD4hep/pull/540))
  - Make python code compatible to python 2 and 3
    - add `absolute_import` and `unicode_literals` to all files
      - fix API calls and cast `unicode` to `string` when needed
    - replace print statement with logging
    - remove old octal literal
    - use future division
    - use `six`:
       - replace `dict.iteritems` with `six.iteritems`
       - replace `xrange` with `range` from `six.move`
       - replace `basestring` with `six.string_types`
       - replace `raw_input` with `input` from `six.moves`
       - added a copy of six.py named ddsix.py to DDCore
    - Replace deprecated `execfile` with call to `open`, `compile` and `exec`
    - Remove usage of `apply`
    - use `io.open` instead of standard `open`
    - convert `except a,b` to `except a as b`
    - change `dict.has_key` to `key in dict`
  - Require DD4hep Python3 CI tests to pass
  - Remove obsolete `lcdd.py`
  - Remove deprecated `SystemOfUnits.py` and replace everywhere with `g4units.py`
  - Flake8 all files

* 2019-09-02 Andre Sailer ([PR#561](https://github.com/AidaSoft/DD4hep/pull/561))
  - CMake: add option `DD4HEP_BUILD_PACKAGES` so that only individual packages can be compiled. If an incorrect selection is given cmake should fail due to missing alias libraries. The option requires a whitespace or semicolon separated list.
  - CMake add option `DD4HEP_BUILD_EXAMPLES` to enable compilation of examples together with the main DD4hep packages. Default OFF
  - CMake: add `DD4hep::` aliases for all libraries and some executables

* 2019-08-26 Andre Sailer ([PR#559](https://github.com/AidaSoft/DD4hep/pull/559))
  - DD4hepConfig: make all DD4HEP_USE variables behave as booleans

* 2019-08-22 Markus Frank ([PR#554](https://github.com/AidaSoft/DD4hep/pull/554))
  - Fix property table translation to Geant4 according to suggestions from Dong Liu
    (see issue https://github.com/AIDASoft/DD4hep/issues/440 )

* 2019-08-22 Andre Sailer ([PR#552](https://github.com/AidaSoft/DD4hep/pull/552))
  * DD4hepConfig: `DD4hepConfig.CMake` now exports `DD4hep::DDCore` `DD4hep::<Component>` targets to be consumed by users of the DD4hep package, the CMake variables `DD4hep_LIBRARIES` etc. are still being filled for backward compatibility
  
  * DD4hep CMake: Only the `dd4hep_add_plugin` and `dd4hep_add_dictionary` CMake functions are to create targets still exist, `dd4hep_add_package`/`library`/`executable` were removed and instead the cmake `default add_library`/`executable` have to be used.
  
  * PluginManager: only link against boost filesystem if the compiler and standard library do not support the filesystem library
  
  * DD4hep Requirements: Now require cmake version 3.12
  
  * DD4hep Requirements: Now require c++ standard 14

* 2019-08-21 Markus Frank ([PR#553](https://github.com/AidaSoft/DD4hep/pull/553))
  - Fix unit conversion for optical surface properties. The units of the property tables were not converted from TGeo to Geant4. See dicussion in issue https://github.com/AIDASoft/DD4hep/issues/440
  - If an external world volume is supplied, the material `Air` is deduced from this solid (only used by CMS).

* 2019-08-15 Frank Gaede ([PR#550](https://github.com/AidaSoft/DD4hep/pull/550))
  - make compatible with MacOS (10.14.6)
       - address latest developments w/ new Gaudi Plugin Manager

* 2019-08-14 Markus Frank ([PR#551](https://github.com/AidaSoft/DD4hep/pull/551))
  - Moved `setDimensions` call out of the individual dd4hep shapes into the base Solid.
  - Add `Solid::dimensions()`, `Solid::setDimension()` implementation for `PseudoTrap` and  `TruncatedTube`. The solution is not optimal, because a analytical solution tends to be ambiguous due to solutions of polynomials of degree 2 and the initial parameters had to be stored as a string.
  - Upgraded shape tests to also check the shapes (using mesh vertices) after a re-dimension using the same parameters.
  - Geant4FieldTrackingSetup: Any failure in the creation of the `G4EquationOfMotion` or the `G4MagIntegratorStepper` is now FATAL and causes an exception.

* 2019-08-12 Markus Frank ([PR#549](https://github.com/AidaSoft/DD4hep/pull/549))
  - Adopted new Gaudi plugin manager V2. V1 can be enabled using compile switch in `DD4hep/config.h`. Removed the traces from the ROOT5 Reflex based plugin service. The new plugin service depends on `Boost::file_system` and `Boost::system`. 
  - Improve GDML saving from ROOT. (requires ROOT >= 6.20)
  - Fix ROOT persistency for the volume manager.
  - Fix Geant4FieldTrackingSetup: Issue warning if the `G4MagIntegratorStepper` cannot be created.
  - Examples: based the CLICSiD example on the XML sources of DDDetectors. This ensures XML sources match C++ sources.

* 2019-08-12 Andre Sailer ([PR#548](https://github.com/AidaSoft/DD4hep/pull/548))
  - Shapes: fix conversion of `startTheta` for Sphere::setDimensions
  - Shapes::get_shape_dimension: add return value conversion for angles to internal unit (radians)

* 2019-08-12 MarkusFrankATcernch ([PR#547](https://github.com/AidaSoft/DD4hep/pull/547))
  - make compatible w/ macos (c++14)
           - replace `std::make_any` w/ make_any (defined in Any.h)
           - use `std::lock_guard<std::mutex>`

* 2019-08-07 MarkusFrankATcernch ([PR#545](https://github.com/AidaSoft/DD4hep/pull/545))
  - Fix bug in Polyhedra shape (See #544).
  - Update optical surface example (resolves #440) .

* 2019-07-16 Markus Frank ([PR#539](https://github.com/AidaSoft/DD4hep/pull/539))
  - Remove clang warnings.

* 2019-07-16 MarkusFrankATcernch ([PR#538](https://github.com/AidaSoft/DD4hep/pull/538))
  - Fix coverity errors 
  - Fix Trap shape conversion to Geant4. The theta/phi angle was not converted from degree to radians (Resolves #536).

* 2019-07-15 Marko Petric ([PR#537](https://github.com/AidaSoft/DD4hep/pull/537))
  - Add a Python 3 pipeline to the CI (currently set to `allow_failure`)

* 2019-07-13 Marko Petric ([PR#535](https://github.com/AidaSoft/DD4hep/pull/535))
  - Update CI to be based on LCG 96 (ROOT 6.18, Geant 10.5, C++17)
  - Remove `FindXercesC.cmake` since it is in CMake

* 2019-07-10 Markus Frank ([PR#533](https://github.com/AidaSoft/DD4hep/pull/533))
  - Optimize STL containers: replace insert/push with emplace. 2nd. episode.

* 2019-07-10 Marko Petric ([PR#532](https://github.com/AidaSoft/DD4hep/pull/532))
  - Remove `dd_sim` (resolves #435)

* 2019-07-10 Marko Petric ([PR#531](https://github.com/AidaSoft/DD4hep/pull/531))
  - Remove shadow warnings related to code interfacing only ROOT 6.18
  - Add `DBoost_NO_BOOST_CMAKE=ON` to examples cmake call as it is necessary now
  - Set CMP0074 policy to NEW if can be set

* 2019-07-10 Markus Frank ([PR#530](https://github.com/AidaSoft/DD4hep/pull/530))
  - Optimize STL containers: replace insert/push with emplace

* 2019-07-09 Markus Frank ([PR#528](https://github.com/AidaSoft/DD4hep/pull/528))
  * Allow for various material scan types from the root interactove prompt
  
         Examples: from DDDetectors/compact/SiD.xml
         $> materialScan file:checkout/DDDetectors/compact/SiD.xml -interactive
       
         1) Simple scan:
            root [0] gMaterialScan->print(5,5,0,5,5,400)
         2) Scan a given subdetector:
            root [0] de=gDD4hepUI->instance()->detector("LumiCal");
            root [1] gMaterialScan->setDetector(de);
            root [2] gMaterialScan->print(5,5,0,5,5,400)
         3) Scan by material:
            root [0] gMaterialScan->setMaterial("Silicon");
            root [1] gMaterialScan->print(5,5,0,5,5,400)
         4) Scan by region:
            root [0] gMaterialScan->setRegion("SiTrackerBarrelRegion");
            root [1] gMaterialScan->print(0,0,0,100,100,0)
  
  * Added copyright notices to the DDRec files.

* 2019-07-09 Marko Petric ([PR#527](https://github.com/AidaSoft/DD4hep/pull/527))
  - Update CI to macOS Mojave 10.14
  - Make `PluginService.cpp` C++17 compliant (addresses partially #525)
    - replace `ptr_fun` with `lambda`
  - Remove deprecated code that uses `auto_prt`
  - Remove deprecated `set_unexpected` from  `DetectorImp.cpp`
  - Remove code associated to `DD4HEP_DD4HEP_PTR_AUTO`

* 2019-07-08 Markus Frank ([PR#524](https://github.com/AidaSoft/DD4hep/pull/524))
  - Get the new package formally into the same shape as the other packages together with an example section.
  - Add small example to test the basic development framework

* 2019-07-04 Markus Frank ([PR#520](https://github.com/AidaSoft/DD4hep/pull/520))
  - From ROOT 6.20 onwards dd4hep shall use the Geant4 unit system (mm, nsec, MeV) instead of the TGeo units (cm, sec, keV). This commit prepares for the necessary changes.
  - A new package was created, which shall host the dd4hep digitization components.
    A small tbb based multi threaded framework was put in place. Now the real work can start.
  - The material scanner has now a switch to run in interactive mode from the ROOT prompt.
    To invoke: materialScan compact.xml  x0 y0 z0 x1 y1 z1 -interactive
    If the interactive switch is missing, the old behavior is preserved.

* 2019-06-26 Markus Frank ([PR#517](https://github.com/AidaSoft/DD4hep/pull/517))
  - Material properties use now default dd4hep units
  - Translated and updated surface example from geant4 to dd4hep
  - Added shape identification using `instanceOf operator (function)`
  - Improved handling of xml files if improperly terminated

* 2019-06-26 MarkusFrankATcernch ([PR#516](https://github.com/AidaSoft/DD4hep/pull/516))
  - CMakeLists: Changed the order in which include directories are listed when compiling, move DD4hep source paths to the front. This fixes a problem if older DD4hep installations are inadvertently in one of the include paths passed to compilers or rootcling (e.g., in LCG Views), fixes #515

* 2019-06-06 Andre Sailer ([PR#514](https://github.com/AidaSoft/DD4hep/pull/514))
  - Gean4ExtraParticles: no longer add decay process to extra particles, this is done by Geant4  resolves #513 
  - ddsim: disable physics.decays by default. This should only be enabled if completely new physics lists are created resolves #513

* 2019-05-09 Markus Frank ([PR#510](https://github.com/AidaSoft/DD4hep/pull/510))
  - Add debug printout of MEE in Geant4 material conversion

* 2019-04-29 MarkusFrankATcernch ([PR#508](https://github.com/AidaSoft/DD4hep/pull/508))
  * Geant4GDMLWriteAction:
    * Add properties to Geant4GDMLWriteAction to steer writing of regions, cuts and sensitive detectors. See github issue #507
      * Property: Export region information to the GDML: ExportRegions, default: True
      * Property: Export energy cut information to the GDML: ExportEnergyCuts, default: True
      * Property: Export sensitive detector information to the GDML: ExportSensitiveDetectors, default: True
    * **Note: The Geant4 physics list must be initialized BEFORE invoking the writer with options. Otherwise the particle definitions are missing! If you ONLY want to dump the geometry to GDML you must call**
      ```
         /run/beamOn 0
      ```
      before writing the GDML file!
      You also need to setup a minimal generation action like:
       ```py
       sid.geant4.setupGun('Gun','pi-',10*GeV,Standalone=True)
       ```

* 2019-04-29 Frank Gaede ([PR#506](https://github.com/AidaSoft/DD4hep/pull/506))
  - add utility materialBudget.cpp 
       - create plots w/ integrated radiation and interaction lengths
  - bug fix in materialScan.cpp
       - print correct endpoint

* 2019-04-17 Marko Petric ([PR#503](https://github.com/AidaSoft/DD4hep/pull/503))
  - DDG4: DDSim add option Physics.zeroTimePDG to configure ignoring particles of given PDG when their properTime is ZERO, e.g. charged leptons undergoing FSR, fixes #390 
  - DDG4: DDSim: fix parsing of rejectPDGs values from the command line

* 2019-04-12 Marko Petric ([PR#502](https://github.com/AidaSoft/DD4hep/pull/502))
  - DDSim: Add Higgs PDG code 25 to rejected codes for reading events

* 2019-04-10 MarkusFrankATcernch ([PR#501](https://github.com/AidaSoft/DD4hep/pull/501))
  - Add access to all Geant4Action derivatives to the Geant4 top level physical volume (world).
  - Add Geant4 GDML writer action accessible and configurable from the Geant4 prompt

* 2019-04-09 Mircho Rodozov ([PR#496](https://github.com/AidaSoft/DD4hep/pull/496))
  - Added powerpc macros check to include header `cxxabi.h`

* 2019-04-01 Markus Frank ([PR#494](https://github.com/AidaSoft/DD4hep/pull/494))
  -  Use shared_ptr instead of home made ref counting for ConditionUpdateCalls
  -  Implement construction parameter access for solids.  This one is a bit tricky: Some shapes (ShapeAssembly, Boolean shapes) had no such parameters. Added them as the sequence of the basic shape parameters + the corresponding matrices.
  -  Add move constructors to handles 
  -  Improve const-ness of detector object in DDG4

* 2019-03-11 Markus Frank ([PR#491](https://github.com/AidaSoft/DD4hep/pull/491))