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$$$$ ROTA     NOTICE  CHAT      11/09/12    21:18:01     7124           
                                             DATE     11/09/12
                                             
  Operateur ROTATION                       Voir aussi :
    ------------------   
    SURF1 = LIG1  ROTA  (N1) FLOT1 ('DINI' DENS1) ('DFIN' DENS2) ...
                    ... POIN1 (POIN2 si 3D) ;


    Description :
    ____________

    The ROTATION operator constructs a surface generated by the
 rotation of a line, a given angle about a point in 2D or an axis
 in 3D.

    Contents :
    _________

    FLOT1       : rotation angle (FLOTTANT type)

    POIN1       : rotation centre (POINT type)

    POIN1 POIN2 : points defining the rotation axis (POINT type)

    LIG1        : line generating the surface (MAILLAGE type)

    DENS1 DENS2 : densities associated with the line LIG1 and the
                  point(s) POIN1 (and POIN2) (FLOTTANT type)

    N1          : number of layers of generated elements (ENTIER type)

    SURF1       : generated surface (MAILLAGE type)


    Note :
    ________

    If N1 is specified, N1 is the number of layers of elements
 generated in the rotation.
 
    If N1 is positive, N1 layers of equal thickness will be generated.

    If N1 is negative, N1 layers will be generated, and their thickness
 will be calculated in relation to the used densities.

    If N1 is not specified, this number is calculated according to
 the used densities.

    If the densities associated with the line LIG1 and the point
 POIN1 (and POIN2) are inaccurate, they may be increased. The accurate
 value of the initial density will be mentioned after the 'DINI' key
 word, that of the final density will be mentioned after the 'DFIN'
 key word.

    If LIG1 is a surface, the rotation is applied on the side 3 of
 that surface if any, and the result is the initial surface plus
 the new one.

    The line LIG1 must be without points on the rotation axis.