NAME

       mkgeo_ball -- build an unstructured mesh of an ellipsoid, in 2d or 3d

SYNOPSIS

               mkgeo_ball options [n]

EXAMPLE

       The following command build a triangle based 2d unstructured mesh of the unit ball

               mkgeo_ball -t 10 > ball-10.geo
               geo -mayavi ball-10.geo

       or in one comand line:

               mkgeo_ball -t 10 | geo -mayavi -

DESCRIPTION

       This command is usefull when testing programs on simple geometries.  Invocation is similar
       to mkgeo_grid (see mkgeo_grid(1), mkgeo_ugrid(1)).  It calls  gmsh  as  unstructured  mesh
       generator.   It avoid the preparation of an input file for a mesh generator.  The optional
       n argument is an integer that specifies the subdivision  in  each  direction.  By  default
       n=10.  The mesh files goes on standard output.

ELEMENT TYPE OPTIONS

       -t     2d mesh using triangles.

       -q     2d mesh using quadrangles.

       -tq    2d mesh using both triangles and quadrangles.

THE MESH ORDER

       -order int
              The  polynomial  pproximation  mesh  order,  for the curved boundary, as defined by
              gmsh.  Defualt is order=1.

THE GEOMETRY

       The geometry can be ellipse/ellipsoid inscribted  in  the  [a,b]x[c,d]  rectangle  or  the
       [a,b]x[c,d]x[f,g] parallelotope. By default a=c=f=-1 and b=d=g=1, thus, the unit balls are
       considered.

       -s     Only a surface mesh is generated: a curved line in 2d or a curved surface  mesh  in
              3d.  In 3d, supports both '-t' and '-q' options.

       -a float

       -b float

       -c float

       -d float

       -f float

       -g float

BOUNDARY DOMAINS

       The meshes defines a domain named boundary that groups all boundary sides.

OTHERS OPTIONS

       -fix

       -nofix By default, internal face and volume node from gmsh are recomputed, since they have
              incorrect coordinate that destroy the convergence properties of isoparametric  high
              order  elements  (order >= 3).  The -nofix option skip this correction: this option
              is available for test purpose.

       -clean clear temporary files (this is the default).

       -noclean
              does not clear temporary files.

       -verbose

       -noverbose
              print intermediate commands and information messages.

SEE ALSO

       mkgeo_grid(1), mkgeo_ugrid(1)