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$$$$ TRIA     NOTICE  PASCAL    12/03/27    21:15:10     7337           
                                             DATE     12/03/27

     Operateur TRIANGULATION                 Voir aussi : VORO
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    The TRIANGULATION operator may be used in the following cases :

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    |  1st possibility    |
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     SURF1 = TRIA LIG1 (N1) ;

     Description :
     _____________

    The  TRIANGULATION  operator  constructs  a mesh  of a planar 
 domain which is defined by its  boundary (LIG1 object).  No node 
 is added on the boundary, nodes  are  added in  the interior  to 
 improve the shape of the triangles. The number of added nodes is 
 kept minimal and can be limited by N1 value.

    Contents :
    __________

    LIG1 : object of MAILLAGE type. It is composed of one or more 
 closed lines. Their orientation and  order  can  vary. LIG1  may 
 contain isolated edges and open lines. The edges are imposed and 
 the resulting mesh (SURF1) will contain them.Of course they must 
 be situated within the given boundary.

   N1   : object of ENTIER type.It is the maximum number of nodes 
 the resulting mesh can have. It must be greater  or equal to the 
 number of nodes of the existing mesh (LIG1).

    Note :
    ______

    The   TRIANGULATION   operator  generates  a  low  number  of 
 triangles;  it is not recommended to use the result directly for 
 finite element computation.  It  is  recommended  to compute the 
 size function  first  and  then adapt the element size with RAFT 
 operator.

    The density computed at each node of the mesh is the  current 
 density (see DENS). It can be positive or nul (unknown).

    TRIANGULATION works only on linear elements :  LIG1  must  be 
 composed of SEG2 type and SURF1 will be composed of  TRI3  type.



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    |  2nd possibility    |
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     MAIL2 = TRIA MAIL1 ('CONV') (FLOT1) ;

     Description :
     _____________

     The TRIANGULATION operator builds the Delaunay triangulation
     of a point set.

    Contents :
    __________

     MAIL1  : point set (MAILLAGE type object of POI1 elements).

     'CONV' : key word which enables to check the convexity of the
              triangulated mesh. The size of the triangulation box is
              increased if necessary.

     FLOT1  : is the element size for the triangulation (FLOTTANT type
              object). New nodes are added to the initial point set.

     MAIL2  : Delaunay triangulation of the point set (MAILLAGE type
              object), made up of TRI3 (TET4) elements in 2D (3D).


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