Geant4 User's Guide for Application Developers - Geant4 - CERN

Getting Started with Geant4- Running a Simple ExampleExample 2.25. The prerunN03.mac macro.# Macro file for the initialization phase of "exampleN03.cc"## Sets some default verbose flags# and initializes the graphics.#/control/verbose 2/control/saveHistory/run/verbose 2#/run/particle/dumpCutValues## Create empty scene ("world" is default)/vis/scene/create## Add volume to scene/vis/scene/add/volume## Create a scene handler for a specific graphics system# Edit the next line(s) to choose another graphic system##/vis/sceneHandler/create DAWNFILE/vis/sceneHandler/create OGLIX## Create a viewer/vis/viewer/create## Draw scene/vis/scene/notifyHandlers## for drawing the tracks# if too many tracks cause core dump => storeTrajectory 0/tracking/storeTrajectory 1#/vis/scene/include/trajectoriesAlso, this example demonstrates that you can read and execute a macro interactively:Idle> /control/execute mySubMacro.mac2.10. How to Visualize the Detector and Events2.10.1. IntroductionThis section briefly explains how to perform Geant4 Visualization. The description here is based on the sampleprogram examples/novice/N03. More details are given in Chapter 8 "Visualization". Example macro filescan be found in examples/novice/N03/visTutor/exN03VisX.mac.2.10.2. Visualization DriversThe Geant4 visualization system was developed in response to a diverse set of requirements:1. Quick response to study geometries, trajectories and hits2. High-quality output for publications3. Flexible camera control to debug complex geometries4. Tools to show volume overlap errors in detector geometries5. Interactive picking to get more information on visualized objectsNo one graphics system is ideal for all of these requirements, and many of the large software frameworks intowhich Geant4 has been incorporated already have their own visualization systems, so Geant4 visualization wasdesigned around an abstract interface that supports a diverse family of graphics systems. Some of these graphicssystems use a graphics library compiled with Geant4, such as OpenGL, Qt or OpenInventor, while others involvea separate application, such as HepRApp or DAWN.You need not use all visualization drivers. You can select those suitable to your purposes. In the following, for simplicity,we assume that the Geant4 libraries are built (installed) with the "OpenGL-Xlib driver" and the "DAWN-FILE driver" incorporated.28