$$$$ DIFF     NOTICE  PASCAL    20/12/02    21:15:00     10798          
                                             DATE     20/12/02

    -------------------------------

    OBJ1 = DIFF  OBJ2 OBJ3 ;


Section : Maillage Manipulation

FRAN==========================================================
    Operateur DIFFERENCE SYMETRIQUE           Voir aussi : ET INTE
    
    Objet :
    _______

    L'operateur DIFF construit la difference symetrique entre deux objets.


    Commentaire :
    _____________

    OBJi : objets de type MAILLAGE, MMODEL ou RIGIDITE.


    Remarque 1 : a DIFF b = ( a union b) - (a inter b)
    ____________


    Remarque 2 : pour les objets MMODEL, l'operation est faite
    ____________ sur les sous-zones. Si l'operation est menee
                 dans le but d'obtenir un modele portant sur les
                 zones geometriques non communes aux deux modeles,
                 alors il convient d'operer sur les maillages.
           

ANGL==========================================================
    Operator DIFFERENCE SYMETRIQUE              See also : ET INTE
    
    Description :
    _____________

    The DIFF operator constructs an object which stems from the
    symmetric difference of two objects.


    Contents :
    __________

    GEOi : MAILLAGE, MMODEL or RIGIDITE type objects.


    Note 1 :  a DIFF b = ( a union b) - (a inter b)
    ________


    Note 2 : for MMODEL type objects, DIFF operates on the MMODEL
    ________ "sous-zones". If the operation aims at obtaining a model
             applying on the mesh elements not common to the 2 given models,
             then it should be carried out directly on the 2 model meshes.

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