Geant4 Geometry and Visualization ===================================== Visualisation, overlap detection are closely related to geometry conversion. So tools that do these should be mined for possibilities. * :google:`geant4 visualization geometry conversion` * http://geant4.web.cern.ch/geant4/UserDocumentation/UsersGuides/ForApplicationDeveloper/html/ch08.html * http://geant4.web.cern.ch/geant4/G4UsersDocuments/UsersGuides/ForApplicationDeveloper/html/Visualization/visdrivers.html * http://nuclear.unh.edu/~maurik/GEANT4/GEANT4_GEOM.html Drivers: OpenGL, HepRep, VRML, DAVID, DAWN * :doc:`/graphics/vrml/vrml` is looking the most promising, as its the most widely supported format exportable Drivers -------- :: [blyth@cms01 visualization]$ du -hs * 1.3M OpenGL 1.1M HepRep 1.1M management 884K OpenInventor 812K modeling 508K XXX 428K VRML 420K RayTracer 380K externals 304K FukuiRenderer 132K History 184K Tree 8.0K GNUmakefile [blyth@cms01 visualization]$ pwd /data/env/local/dyb/trunk/external/build/LCG/geant4.9.2.p01/source/visualization DAVID ------- * http://geant4.web.cern.ch/geant4/G4UsersDocuments/UsersGuides/ForApplicationDeveloper/html/Detector/geomOverlap.html The Geant4 DAVID visualization tool can infact automatically detect the overlaps between the volumes defined in Geant4 and converted to a graphical representation for visualization purposes. The accuracy of the graphical representation can be tuned onto the exact geometrical description. In the debugging, physical-volume surfaces are automatically decomposed into 3D polygons, and intersections of the generated polygons are investigated. If a polygon intersects with another one, physical volumes which these polygons belong to are visualized in color (red is the default). OpenGL ------- * http://en.wikipedia.org/wiki/OpenGL Paint by gl calls approach. Pre-2.0 glsl, so no explicit(useful) geometry conversion. :: [blyth@cms01 src]$ vi G4OpenGLSceneHandler.cc [blyth@cms01 src]$ pwd /data/env/local/dyb/trunk/external/build/LCG/geant4.9.2.p01/source/visualization/OpenGL/src