/// Create the context for the matrix tests.
    void SetUp()
    {        
        sofa::component::init();
//        if( sofa::simulation::getSimulation()==NULL )
        sofa::simulation::setSimulation(simulation = new sofa::simulation::graph::DAGSimulation());

        /// Create the scene
        root = simulation->createNewGraph("root");

        PointSetTopologyContainer::SPtr topology = New<PointSetTopologyContainer>();
        root->addObject(topology);

        dofs = New<MechanicalObject>();
        root->addObject(dofs);

        projection = New<ProjectToPlaneConstraint>();
        root->addObject(projection);

        /// Set the values
        numNodes = 3;
        dofs->resize(numNodes);


        origin = CPos(0,0,0);
        projection->f_origin.setValue(origin);
        normal = CPos(1,1,1);
        projection->f_normal.setValue(normal);

    }
    /// Create the context for the tests.
    void SetUp()
    {
//        if( sofa::simulation::getSimulation()==NULL )
        sofa::simulation::setSimulation(simulation = new sofa::simulation::graph::DAGSimulation());

        /// Create the scene
        root = simulation->createNewGraph("root");

        PointSetTopologyContainer::SPtr topology = core::objectmodel::New<PointSetTopologyContainer>();
        root->addObject(topology);

        dofs = core::objectmodel::New<MechanicalObject>();
        root->addObject(dofs);

        projection = core::objectmodel::New<ProjectToLineConstraint>();
        root->addObject(projection);

        /// Set the values
        numNodes = 3;
        dofs->resize(numNodes);


        origin = CPos(0,0,0);
        projection->f_origin.setValue(origin);
        direction = CPos(1,1,1);
        projection->f_direction.setValue(direction);

    }
    /// Create the context for the tests.
    void SetUp()
    {        
//        if( sofa::simulation::getSimulation()==NULL )
        sofa::simulation::setSimulation(simulation = new sofa::simulation::graph::DAGSimulation());

        /// Create the scene
        root = simulation->createNewGraph("root");

        dofs = core::objectmodel::New<MechanicalObject>();
        root->addObject(dofs);

        projection = core::objectmodel::New<SkeletalMotionConstraint>();
        root->addObject(projection);

       


    }