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Geant4 Geometry Exports

Introduction Resources

Solid LV PV

  • LV is everything but the position

Geometrical Hierarchy

  • Position and rotation of the daughter volume is described with respect to the local coordinate system of the mother volume
  • The origin of the mother’s local coordinate system is at the center of the mother volume
  • Daughter volumes cannot protrude from the mother volume
  • Daughter volumes cannot overlap
  • Logical volume of mother knows the daughter volumes it contains
    • It is uniquely defined to be their mother volume
    • If the logical volume of the mother is placed more than once, all daughters appear by definition in all these physical instances of the mother
  • The origin of the global coordinate system is at the center of the world volume

Touchables

A touchable for a volume serves the purpose of providing a unique identification for a detector element. Via copy numbers eg A.3/B.2/C.1