Gabriele Cosmo
40 lines
1.6 KiB
Plaintext
40 lines
1.6 KiB
Plaintext
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Geant4 - an Object-Oriented Toolkit for Simulation in HEP
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examples/extended/visualization/standalone
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This example illustrates how one might use the Geant Visualization
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System as a "stand alone" graphics library and viewer. It makes use
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of the "user action" feature of the Geant4 vis manager - for a fuller
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example of the use of this feature see
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examples/extended/visualization/userVisAction.
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1) Define a G4VUserVisAction that implements a Draw method. An
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example is provided - see StandaloneVisAction.hh/cc.
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StandaloneVisAction::Draw illustrates:
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a) a simple box;
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b) a Boolean solid;
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c) an alternative way of drawing a solid by obtaining the
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polyhedral representation.
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The last is included for interest, not as a recommendation.
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2) In the main program, StandaloneVisAction must be instantiated and
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its pointer registered with the visualization manager. You may
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optionally specify an extent at this point to assist the viewers to
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locate the objects.
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3) To visualise, use the usual Geant4 vis commands to create a view
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and scene, then add the vis action to the scene, optionally with an
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extent - see standalone.mac.
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Note: The system needs an "extent" in order to point the virtual
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camera and adjust its field of view, etc. This defines the "standard
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view". You may zoom, etc., from this standard view. The extent may
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be specified as suggested above or by using /vis/scene/add/extent.
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John Allison
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27th November 2014
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