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Using Modern Software Technologies for Detector and Event Visualization

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Using Modern Software Technologies for Detector and Event Visualization Using modern software technologies for detector and event visualization N. V. Khomutov JINR, Dubna, Russia Developments of Researches in Lepton Flavor Physics with Muons ! Tokyo ❋ 5-7 April 2018 1 Paraview ● ParaView is an open-source, multi-platform data analysis and visualization application for extremely large datasets using distributed memory computing resources ● Developed jointly by Sandia National Labs + Los Alamos National Lab + Kitware Inc. ● Latest binary release 5.4.1 (2017-Aug), available for Linux/Mac/Windows ● ParaView is based on VTK and QT libraries with Python embedding http://www.paraview.org 2 Paraview Main Features ● An open, flexible, and intuitive user interface ● Cross-platforms data analysis ● Client-Server architecture ● Multiple simultaneous data views ● An extensible, modular architecture based on open standards ● Support for distributed computation models to process large data sets on desktop and HPC systems ● Animation possibilities 3 Paraview User Interface ● Menu Bar ● Toolbars ● Pipeline Browser ● Object inspector ● 3D View 4 Two major workflow Paraview modes ● Standalone Mode Client Data Render Server Server ● Client-Server Mode Client 1 HPC System Data Render Client 2 ServerData RenderServer ServerData RenderServer ServerData RenderServer Server Server Client `n` 5 Visualization Toolkit ● VTK is an open-source, freely available software system for 3D computer graphics, image processing, and visualization ● VTK is cross-platform and runs on Linux, Windows, Mac, and Unix platforms ● Integrates seamlessly with a variety of windowing systems including Qt, FLTK, wxWindows, Tcl/Tk, Python/Tk, Java, X11, Motif, Windows, Cocoa, and Carbon ● VTK has excellent support for distributed-memory parallel processing under MPI ● VTK development was started in December 1993 by Will Schroeder, Ken Martin and Bill Lorensen https://www.vtk.org 6 VTK is Language Agnostic ● The core functionality of VTK is written in C++ to maximize efficiency ● VTK’s build system has built-in support to generate primary bindings to Python, Java, and Tcl. ● Interpreted layer generated automatically by VTK wrapping process 7 HepRep XML format ● HepRep format is the basic part of a complete generic interface for client-server HEP Event Display Representables. ● The .heprep file is an XML format, which means that it is self- describing and a hierarchical structure. ● HepRep was not developed specifically for Geant4 but is intended as a generic interface between data sources and display clients. ● HepRep does not have exactly the same set of graphics primitives as Geant4. Geant4 solves this by decomposing some of the more complex Geant4 shapes into simpler polygons. ● HepRep v2.0 served by BaBar HepEventServer since Dec 2000 http://www.slac.stanford.edu/BFROOT/ 8 Geant4 -> HepRep XML -> Paraview ● Install Geant4 with following option: DGEANT4_USE_SYSTEM_ZLIB=ON (by default is OFF) ● Command macros to produce HepRep XML file /vis/open HepRepXML /vis/drawVolume /vis/viewer/flush ● Adam L. Lyon (FNAL g-2 Collaboration) developed plugin for Paraview named ‘GeantToVTK-1.4’ 9 Muon g-2 Event Display Main developer: V. Krylov, JINR ● The main goal is to create a complex application in order to visualize interactive 3D model of Muon g-2 framework for demonstrative and supervisory tasks ● The application should receive significant spot check of data from common online data stream and visualize it in intuitive and well apprehensible forms ● Event Monitor was developed as multithreaded and multi-document application based on Python v2.7 cross- platform language and VTK toolkit v6.3.0 ● Connection to online data steam is implemented by ZeroMQ network client 10 HepRep XML -> Paraview -> VTK ● Memory size and loading time problems o g-2 Geometry.heprep.zip file size is 60.9 GBytes o it includes more then 13,535 graphical objects o workstation need more then 16 GBytes RAM! o Paraview loading time ~ 10 min (MAC workstation) ● Need to translate HepRep to VTK multi block format o g-2 Geometry.vtm.zip file size is 62 MBytes o it includes more then 13,535 vtk files o Loading time ~ 25 sec (notebook) 11 Muon g-2 Event Display user interface 12 Muon g-2 Event Display calorimeters histograms 13 Muon g-2 Event Display presentation view 14 Examples of PIBETA/PEN detector visualisation with VTK 15 Thank you! 16 HepRep XML file example <?xml version="1.0" ?> <heprep version="2.0“ xmlns=http://java.freehep.org/schemas/heprep/2.0 xmlns:xsi=http://www.w3.org/2001/XMLSchema-instance xsi:schemaLocation="http://java.freehep.org/schemas/heprep/2.0 http://java.freehep.org/schemas/heprep/2.0/HepRep.xsd"> <layer order="Geometry, Event, CalHit, Trajectory, Hit"/> <typetree name="G4GeometryTypes" version="1.0"> <type name="Geometry"> <attvalue name="Generator" value="Geant4"/> <attvalue name="GeneratorVersion“ value=" Geant4 version Name: geant4-10-02-patch-02 (17-June-2016)"/> <type name="world"> <type name="*Face"> <type name="ArcSection[00]"> <type name="Collimator"> <attvalue name="Solid" value="Collimator"/> <attvalue name="Material" value="G4_Cu"/> <attvalue name="Density" type="double" value="5.59239e+19"/> <attvalue name="State" value="Solid"/> <attvalue name="Visibility" type="boolean" value="true"/> </type> … </type> </type> </type> </typetree> <instancetree name="G4GeometryData“ typetreename="G4GeometryTypes" typetreeversion="1.0" version="1.0"> <instance type="Geometry"> <instance type="Geometry/world"> <instance type="Geometry/world/ArcSection[00]"> <instance type="Geometry/world/ArcSection[00]/Collimator"> <instance type="Geometry/world/ArcSection[00]/Collimator/*Face"> <point x="-3598.31" y="3.78554e-13" z="6192.46"/> <point x="-3581" y="3.80392e-13" z="6202.48"/> <point x="-3580.2" y="12.941" z="6200.97"/> <point x="-3597.4" y="12.941" z="6191.01"/> </instance> … </instance> </instance> </instancetree> </heprep> 17 Muon g-2 Event Display Prerequisites ● Along with Python v2.7 the following libraries are used: ➢ Conda v4.3.17 (3-clause BSD license), you should use this repository on Mac OS platform ➢ Python v2.7.3 x64 (GPL compatibility); ➢ VTK Toolkit v6.3.0 x64 (BSD license), the Visualization Toolkit is an open-source cross-platform software system for 3D computer graphics; ➢ wxPython v4.0.0rc x64 (LGPL License), cross-platform GUI toolkit for the Python; ➢ PyZMQ v16.0.2 amd64 (LGPL License), this is the Python bindings for ØMQ. ZeroMQ is a network concurrency framework; ➢ Matplotlib v2.0.0 (PSF License), Python 2D plotting library; ➢ Numpy v1.12.2 (New BSD License), this is well known fundamental package for scientific computing with Python. ➢ Python.app v1.2 (License Unspecified) to use on Mac OS platform only 18 GEANT (GEometry ANd Tracking) ● This is a toolkit for the simulation of the passage of particles through matter. ● The first version of GEANT dates to 1974 ● The first version of GEANT3 dates to 1982 ● Last version of GEANT3 was v3.21 near 2000 ● It was written in FORTRAN and eventually maintained as part of CERNLIB. ● It is available under the GNU General Public License with the exception of some hadronic interaction code contributed by the FLUKA collaboration. 19.
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