QuirkWatcher Node1 QuirkWatcher - m_particleChange + QuirkWatcher() + ~QuirkWatcher() + PostStepGetPhysicalInteraction Length() + PostStepDoIt() + AlongStepGetPhysicalInteraction Length() + AtRestGetPhysicalInteraction Length() + AlongStepDoIt() + AtRestDoIt() Node2 G4VProcess Node2->Node1