ForwardTracker::ParticleTracker Node1 ForwardTracker::Particle Tracker + ParticleTracker() + operator()() Node2 ForwardTracker::IParticle + ~IParticle() + position() + position() + positionRelBeam() + direction() + direction() + displacement() + transversePosition() + z() + z() and 12 more... Node2->Node1 -m_particle