else if ( theNbNodes == 20 ) return VTK_QUADRATIC_HEXAHEDRON;
else if ( theNbNodes == 27 ) return VTK_TRIQUADRATIC_HEXAHEDRON;
else if ( theNbNodes == 15 ) return VTK_QUADRATIC_WEDGE;
+ else if ( theNbNodes == 18 ) return VTK_BIQUADRATIC_QUADRATIC_WEDGE;
else if ( theNbNodes == 13 ) return VTK_QUADRATIC_PYRAMID;//VTK_CONVEX_POINT_SET;
else return VTK_EMPTY_CELL;