else if ( theNbNodes == 3 ) return VTK_TRIANGLE;
else if ( theNbNodes == 4 ) return VTK_QUAD;
else if ( theNbNodes == 6 ) return VTK_QUADRATIC_TRIANGLE;
else if ( theNbNodes == 3 ) return VTK_TRIANGLE;
else if ( theNbNodes == 4 ) return VTK_QUAD;
else if ( theNbNodes == 6 ) return VTK_QUADRATIC_TRIANGLE;