ExtFace Node1 ExtFace + iedges + rmin + rmax + iold + inew + iprev + inext + ExtFace() + ~ExtFace() + ExtFace() + operator=() + invert() Node2 std::vector< ExtEdge > Node2->Node1 -m_edges Node3 ExtEdge + i1 + i2 + iface1 + iface2 + ivis + inext + ExtEdge() + ~ExtEdge() + ExtEdge() + operator=() + invert() Node3->Node2 +elements Node4 HEPVis::SbPlane - m_normal - m_distance + SbPlane() + SbPlane() + SbPlane() + getDistance() + getNormal() + getDistanceFromOrigin() + distance() Node4->Node1 +plane