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Visualization of the ROOT 3D class objects with Open Inventor-like viewers

Visualization of the ROOT 3D class objects with Open Inventor-like viewers. V. Fine (BNL) A. Kulikov (JINR Dubna) M. Panebrattsev (Dubna University) A. Kulikova (MEPHI Moscow). preface.

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Visualization of the ROOT 3D class objects with Open Inventor-like viewers

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  1. Visualization of the ROOT 3D class objects with OpenInventor-like viewers V. Fine (BNL) A. Kulikov (JINR Dubna) M. Panebrattsev (Dubna University) A. Kulikova (MEPHI Moscow)

  2. preface • This work was done by a group of summer students from Moscow Engineering and Physics Institute (MEPHI), University of Dubna of STAR Group at JINR. • This group is involved in data analysis of STAR experiment at BNL. • The experiment deals with a huge amount of data. It requires a new approaches to be introduced. ACAT03

  3. Why do we need it. • There is a strong need to introduce new ideas and methods to debug the simulation and track reconstruction software within STAR framework. • The good portion of computational force (and price) of the modern computer, first of all so-called Desktop PC, belongs its sophisticated video card with advanced 3D accelerators. So far this vast power did not play any major role in the High Energy Physics research due lack of the software that can be feed by the HEP data. • That can be done by developing the class libraryto allow using the commercial quality 3D viewers like "Open Inventor" both stand-alone as well as a built-in ROOT 3D viewer to make the cutting / highlighting / selecting pieces of the detectors and events fruitful and ease. It makes possible to see the inner parts of the detector,which usually covered by outer parts. That would create the impressive pictures of events and the detail views of the detectors facilitating the design, simulation and data analysis and representation the huge amount the information flooding the modern HEP experiments ACAT03

  4. From AGE Geometry Specification to Open Inventor format (IV)Originally the detector geometry is defined by the special language called AGE (Geometry Specification Langugae). We solve the problem of the C++ object visualisation by converting it to the .iv format. So You can easily view and manipulate the detector geometry. AGE (geometry specification language) Macro preprocessor Fortran GEANT3 GEANT3 compile See next slide Zebra structure C++ object TVolumeView Converter to iv format .fz files .root files Iv files ACAT03

  5. Convertion of zebra banks to ROOT C++ objects • ftp://root.cern.ch/root2k/pavelR2000.ppt ACAT03

  6. ROOT Class library for converting TVolumeView objects to the .iv format. • We developed ROOT class library which converts the ROOT TVolumeView object to the .iv file. So it is possible to use the standard 3dViewer to see the detector geometry. • The TVolumeView object is a tree of rudimentary shapes described by TBRIK, TTUBE, etc. classes. So our library mainly consists of the special convertor classes for each of this shape (TIVBrik, TIVTube, etc.). • For the round objects (TTube, TCone, etc.) it is possible to set the “CutNumber” which represents what part of these objects you want to see. • Usually it is not necessary to see all parts of the detector, so you can define the depths of the objects in a tree which you want to see. ACAT03

  7. ROOT TShape classes TTUBS TBRIK TTRD1 TCONS TTRD2 TPARA TPCON TTUBE TGTRA TPGON TCONE TTRAP ACAT03

  8. Convertor Class Library TIVBrik TIVTrd1 TIVFile TIVShape TIVPCon TIVCone TR2iv TIVTube TIVTubs TIVCTub ACAT03

  9. TVolumeView into.iv format conversion example. { TR2iv riv(ATLS, 3, 4); // ATLS – Pointer to theTVolumeView object // 3 and4 is the depth interval in which shapes will be converted TIVShape::SetCut(1) // Sets the CutNumber for the round objects (1 – whole object, 2- half object) riv.Draw(“ATLAS.iv"); // WritesTVolumeView *ATLS into theATLAS.iv file. } ACAT03

  10. … TR2iv riv(ATLS, 3, 4); TIVShape::SetCut(1); … … TR2iv riv(ATLS, 3, 4); TIVShape::SetCut(2) … Examples In this two pictures you can see how the outer cylinder was cut. ACAT03

  11. Detail view of inner part of ATLAS ACAT03

  12. … TR2iv riv(ATLS, 4, 4); TIVShape::SetCut(2); … In this case several detector parts were removed manually in the 3d Viewer Examples Here we set the bigger depth level so the outer cylinders disappeared. Than the unnecessary parts was removed using the viewer features. ACAT03

  13. Events It is also possible to include tracks to the detector geometry. STAR Detector with real tracks ACAT03

  14. Results • Several convertor classes were created. • It is possible to download the class library and example root file containing ATLAS geometry • In our future plan is to create whole set of convertor classes and some additional features which can help to get a better image of the detector. For example two plane cut of the detector. • All the suggestions and questions you can send to the mpanebr@sunhe.jinr.ru ACAT03

  15. STAR Simulation (ppt) (html): Pavel Nevski • (ftp://root.cern.ch/root2k/pavelR2000.ppt) • STAR Framework and Visualisation (ppt) (html): Valery Fine • ftp://root.cern.ch/root2k/StarFrameWorkAbd3D.ppt ACAT03

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