Graphical Class Hierarchy Node7409 Trk::Material Node7410 Trk::BinnedMaterial Node7409->Node7410 Node2 Trk::TrackingVolume Node7409->Node2 Node3 Trk::AlignableTrackingVolume Node2->Node3 Node0 Trk::Volume Node0->Node2 Node1 Trk::AbstractVolume Node0->Node1