Trk::VKThetaConstraint Node1 Trk::VKThetaConstraint + VKThetaConstraint() + ~VKThetaConstraint() + clone() + applyConstraint() Node2 Trk::VKConstraintBase + NCDim + NTrk + aa + f0t + h0t # m_originVertex # m_type + VKConstraintBase() + ~VKConstraintBase() + getOriginVertex() + getType() + clone() + applyConstraint() Node2->Node1