Gabriele Cosmo
74 lines
2.3 KiB
Plaintext
74 lines
2.3 KiB
Plaintext
$Id: README,v 1.2 2010-09-17 11:21:45 maire Exp $
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-------------------------------------------------------------------
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=========================================================
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Geant4 - an Object-Oriented Toolkit for Simulation in HEP
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=========================================================
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transforms
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----------
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This example shows various ways of definition of 3D transformations for
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placing volumes.
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1- Geometry construction
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---------------------
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Two G4Trd volumes (daughters) are placed within a G4Tubs (mother), as shown
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in picture rotm.jpg
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The various ways of placement are implemented in the DetectorConstruction class
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in the following private functions:
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- PlaceWithDirectMatrix()
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- PlaceWithInverseMatrix()
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- PlaceWithAxialRotations()
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- PlaceWithEulerAngles()
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- PlaceWithReflections()
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which are then called from the Construct() function.
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All methods define exactly same geometry except for the placement
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with reflection where trapezoids are placed with their symmetry axis
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in parallel with z-axis in order to make easier to check reflection
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visually.
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The method of placement can be selected interactively via the command
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(see DetectorMessenger):
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/placement/setMethod method (see debug.mac)
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2- Physics list
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------------
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PhysicsList.cc defines only geantino and transportation process.
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3- Primary generator
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-----------------
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Default kinematic is a geantino, at rest, at coordinate origin.
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Can be changed with particleGun commands.
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4- Physics
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-------
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No physics; only transportation.
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5- Visualisation
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-------------
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Visualization Manager is set in the main().
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Initialisation of the drawing is done via the commands
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/vis/.. in the macro vis.mac. This macro is automatically read from the main
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in case of interactive running mode.
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6- How to start ?
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--------------
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- execute transforms in 'interactive mode' with visualization
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% transforms
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....
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Idle> ---> type your commands. For instance:
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Idle> /control/execute debug.mac
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....
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Idle> /placement/setMethod WithInverseMatrix
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Idle> /run/beamOn 1
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....
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Idle> exit
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- execute transforms in 'batch' mode from macro files
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% transforms debug.mac
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