CompareTransformationsModule Class Reference

Inheritance diagram for CompareTransformationsModule:

Collaboration diagram for CompareTransformationsModule:

Public Member Functions
	__init__ (self)
	initialize (self)
	event (self)

Public Attributes
int	test_shift_z = 10.
	Shift of a sensor.

Detailed Description

Python module to compare transformations stored in GeoCache and computed by the hierarchy

Definition at line 28 of file GeoCacheHierarchy.py.

Constructor & Destructor Documentation

__init__()

__init__

(

self

)

 constructor 

Definition at line 31 of file GeoCacheHierarchy.py.

    def __init__(self):
        """ constructor """
        super().__init__()
        
        self.test_shift_z = 10.
 

Member Function Documentation

event()

event

(

self

)

 test that moving a ladder moves the sensor in the event processing 

Definition at line 58 of file GeoCacheHierarchy.py.

    def event(self):
        """ test that moving a ladder moves the sensor in the event processing """
        cache = Belle2.VXD.GeoCache.getInstance()
 
        original_global_sensor_z = cache.getSensorInfo(Belle2.VxdID("1.1.1")).pointToGlobal(ROOT.Math.XYZVector(0, 0, 0), True).Z()
 
        # Now move ladder... we need a copy of the current alignment
        alignment = Belle2.PyDBObj("VXDAlignment").obj().Clone()
        # Set the ladder here, not the sensor
        alignment.set(Belle2.VxdID("1.1.0").getID(), Belle2.VXDAlignment.dW, self.test_shift_z)
        # and add the object to the database store. This will run the callback
        Belle2.DBStore.Instance().addConstantOverride("VXDAlignment", alignment)
 
        new_global_sensor_z = cache.getSensorInfo(Belle2.VxdID("1.1.1")).pointToGlobal(ROOT.Math.XYZVector(0, 0, 0), True).Z()
 
        # expect that sensor moved with the ladder
        print("Now testing that moving a ladder moves a sensor correspondingly...")
        assert (abs(new_global_sensor_z - original_global_sensor_z - self.test_shift_z) < 1.e-14)
 
 

initialize()

initialize

(

self

)

 module initialization - after geometry, so GeoCache is ready 

Definition at line 37 of file GeoCacheHierarchy.py.

    def initialize(self):
        """ module initialization - after geometry, so GeoCache is ready """
        cache = Belle2.VXD.GeoCache.getInstance()
 
        print("Now testing hierarchy can compute nominal sensor positions...")
        # We check the trafos for EACH sensor
        for sensor in cache.getListOfSensors():
            # Nominal trafo stored by findVolumes() after geometry is created
            nominal = cache.getSensorInfo(sensor).getTransformation(False)
            # Trafo computed by the stored matrix chain in hierarchy (includes alignment,
            # but as we use exp=0, run=0 we should always get zero alignment. Therefore
            # we know both matrices have to be the same. Let's compare them element by element
            reco = cache.getSensorInfo(sensor).getTransformation(True)
 
            # First rotation component
            for i in range(0, 9):
                assert (abs(nominal.GetRotationMatrix()[i] - reco.GetRotationMatrix()[i]) < 1.e-14)
            # Then translations
            for i in range(0, 3):
                assert (abs(nominal.GetTranslation()[i] - reco.GetTranslation()[i]) < 1.e-14)
 

Member Data Documentation

test_shift_z

test_shift_z = 10.

Shift of a sensor.

Definition at line 35 of file GeoCacheHierarchy.py.

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The documentation for this class was generated from the following file:

• vxd/tests/GeoCacheHierarchy.py