def _preinitialize(self):
    """
    Setup mesh and integrator and preinitialize integrator.
    """
    from spatialdata.units.Nondimensional import Nondimensional
    normalizer = Nondimensional()
    normalizer._configure()

    # Setup mesh
    cs = CSCart()
    cs.inventory.spaceDim = 2
    cs._configure()
    from pylith.meshio.MeshIOAscii import MeshIOAscii
    importer = MeshIOAscii()
    importer.inventory.filename = "data/tri3.mesh"
    importer.inventory.coordsys = cs
    importer._configure()
    mesh = importer.read(debug=False, interpolate=False)

    # Setup material
    from pylith.feassemble.FIATSimplex import FIATSimplex
    cell = FIATSimplex()
    cell.inventory.dimension = 2
    cell.inventory.degree = 1
    cell.inventory.order = 1
    cell._configure()
    from pylith.feassemble.Quadrature import Quadrature
    quadrature = Quadrature()
    quadrature.inventory.cell = cell
    quadrature._configure()
    
    from spatialdata.spatialdb.SimpleDB import SimpleDB
    from spatialdata.spatialdb.SimpleIOAscii import SimpleIOAscii
    iohandler = SimpleIOAscii()
    iohandler.inventory.filename = "data/elasticplanestrain.spatialdb"
    iohandler._configure()
    db = SimpleDB()
    db.inventory.label = "elastic plane strain"
    db.inventory.iohandler = iohandler
    db._configure()

    from pylith.materials.ElasticPlaneStrain import ElasticPlaneStrain
    material = ElasticPlaneStrain()
    material.inventory.label = "elastic plane strain"
    material.inventory.id = 0
    material.inventory.dbProperties = db
    material.inventory.quadrature = quadrature
    material._configure()
    
    from pylith.meshio.OutputMatElastic import OutputMatElastic
    material.output = OutputMatElastic()
    material.output._configure()
    material.output.writer._configure()

    # Setup integrator
    integrator = ElasticityImplicitLgDeform()
    integrator.preinitialize(mesh, material)
    return (mesh, integrator)
    def _preinitialize(self):
        """
    Setup mesh and integrator and preinitialize integrator.
    """
        from spatialdata.units.Nondimensional import Nondimensional
        normalizer = Nondimensional()
        normalizer._configure()

        # Setup mesh
        cs = CSCart()
        cs.inventory.spaceDim = 2
        cs._configure()
        from pylith.meshio.MeshIOAscii import MeshIOAscii
        importer = MeshIOAscii()
        importer.inventory.filename = "data/tri3.mesh"
        importer.inventory.coordsys = cs
        importer._configure()
        mesh = importer.read(debug=False, interpolate=False)

        # Setup material
        from pylith.feassemble.FIATSimplex import FIATSimplex
        cell = FIATSimplex()
        cell.inventory.dimension = 2
        cell.inventory.degree = 1
        cell.inventory.order = 1
        cell._configure()
        from pylith.feassemble.Quadrature import Quadrature
        quadrature = Quadrature()
        quadrature.inventory.cell = cell
        quadrature._configure()

        from spatialdata.spatialdb.SimpleDB import SimpleDB
        from spatialdata.spatialdb.SimpleIOAscii import SimpleIOAscii
        iohandler = SimpleIOAscii()
        iohandler.inventory.filename = "data/elasticplanestrain.spatialdb"
        iohandler._configure()
        db = SimpleDB()
        db.inventory.label = "elastic plane strain"
        db.inventory.iohandler = iohandler
        db._configure()

        from pylith.materials.ElasticPlaneStrain import ElasticPlaneStrain
        material = ElasticPlaneStrain()
        material.inventory.label = "elastic plane strain"
        material.inventory.id = 0
        material.inventory.dbProperties = db
        material.inventory.quadrature = quadrature
        material._configure()

        from pylith.meshio.OutputMatElastic import OutputMatElastic
        material.output = OutputMatElastic()
        material.output._configure()
        material.output.writer._configure()

        # Setup integrator
        integrator = ElasticityImplicitLgDeform()
        integrator.preinitialize(mesh, material)
        return (mesh, integrator)