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#### Dawn (optionnal):

Geant4 can support many visualisation application and the user is free to chose the one which he prefers to use. Danw is a usefull application, whih allow to generate *.eps files from three dimensional OpenGL pictures [4]. The instalation is done easily following the website intructions. The following environment variables should be defined:

    export G4DAWN_NAMED_PIPE=1
    export G4DAWN_GUI_ALWAYS=1
    export G4DAWN_GUI_ALWAYS=1
    export G4VIS_USE_DAWN=1
    export G4DAWN_NAMED_PIPE=1
    export DAWN_PS_PREVIEWER=/usr/X11R6/bin/gv