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feat: Introduce detector misalignment in Examples #5288

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34 changes: 33 additions & 1 deletion Examples/Scripts/Python/full_chain_odd.py
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Original file line number Diff line number Diff line change
Expand Up @@ -37,6 +37,11 @@
addSeedFilterML,
SeedFilterMLDBScanConfig,
)
from acts.examples.alignment import (
AlignmentDecorator,
AlignmentGeneratorLocalShift,
GeoIdAlignmentStore,
)
from acts.examples.odd import getOpenDataDetector, getOpenDataDetectorDirectory

u = acts.UnitConstants
Expand Down Expand Up @@ -169,7 +174,7 @@
oddSeedingSel = actsDir / "Examples/Configs/odd-seeding-config.json"
oddMaterialDeco = acts.IMaterialDecorator.fromFile(oddMaterialMap)

detector = getOpenDataDetector(odd_dir=geoDir, materialDecorator=oddMaterialDeco)
detector = getOpenDataDetector(odd_dir=geoDir, materialDecorator=oddMaterialDeco, misaligned=True)
trackingGeometry = detector.trackingGeometry()
decorators = detector.contextDecorators()
field = acts.ConstantBField(acts.Vector3(0.0, 0.0, 2.0 * u.T))
Expand All @@ -182,6 +187,33 @@
outputDir=str(outputDir),
)

# Collect the nominal transforms for all surfaces before applying any
# misalignment. This is needed for the alignment decorator to work, because
# it needs to know the nominal positions before applying any changes.
ctx = acts.GeometryContext.dangerouslyDefaultConstruct()
nominal_transforms = {}

def collect_transforms(surface):
nominal_transforms[surface.geometryId] = surface.localToGlobalTransform(ctx)

trackingGeometry.visitSurfaces(collect_transforms)
nominal_store = GeoIdAlignmentStore(nominal_transforms)

# Introduce a fixed misalignment in X by 0.05 mm.
gen_shift = AlignmentGeneratorLocalShift()
gen_shift.axisDirection = acts.AxisDirection.AxisX
gen_shift.shift = 0.05 * u.mm

# Define the interval of validity for the misalignment.
iov_start_end = (0, args.events + args.skip + 1)

# Create the alignment decorator and add it to the sequencer.
align_cfg = AlignmentDecorator.Config()
align_cfg.nominalStore = nominal_store
align_cfg.iovGenerators = [(iov_start_end, gen_shift)]
alignment_decorator = AlignmentDecorator(align_cfg, acts.logging.DEBUG)
s.addContextDecorator(alignment_decorator)

if args.edm4hep:
import acts.examples.edm4hep
from acts.examples.edm4hep import PodioReader
Expand Down
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