Gabriele Cosmo
51 lines
1.6 KiB
Plaintext
51 lines
1.6 KiB
Plaintext
$Id$
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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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Example Transforms
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-------------------
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This extended example demonstrates various ways of definition of
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3D transformations for placing volumes.
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The geometry setup consists of two trapezoid volumes which are placed
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in a world so that their axial symmetry axis is in given theta and phi
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polar angles. The various ways of placement are implemented in the
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TrDetectorConstruction class 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 TrDetectorConstructionMessenger):
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/transform/setMethod method
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The example is defined with use of classes from the common examples.
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These classes from common start with the ExG4 prefix while the
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classes relevant to transfomation start with the Tr prefix.
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To run example:
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% transforms
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PreInit> /transform/setMethod WithDirectMatrix
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PreInit> /run/initialize
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Init> /run/beamOn 1
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