field (1rheolef)

        field options filename[.field[.gz]]

Read and output a finite element field from file.

        field square.field
        field square.field -bw
        field box.field

filename

specifies the name of the file containing the input field.

-

read field on standard input instead on a file.

-Idir

-I dir

Add dir to the rheolef file search path. This option is usefull e.g. when the mesh .geo and the .field fikes are in different directories. This mechanism initializes a search path given by the environment variable `RHEOPATH'. If the environment variable `RHEOPATH' is not set, the default value is the current directory.

-catchmark label

Jump accross the file to the specifield label. Label start at the begining of a line, preceded by a `#' mark (see see catchmark(4)).

-field

output field on standard output stream in field text file format.

-gmsh

output field on standard output stream in gmsh text file format.

-gmsh-pos

output field on standard output stream in gmsh-pos text file format, suitable for mesh adaptation purpose.

-bamg-bb

output field on standard output stream in bamg-bb text file format, suitable for mesh adaptation purpose.

-image-format string

The argument is any valid image format, such as bitmap png, jpg, gif or vectorial ps or pdf image file formats, and that could be handled by the corresponding render. The output file is e.g. basename.png when basename is the name of the mesh, or can be set with the -name option.

-min

-max

print the min (resp. max) value of the scalar field and then exit.

-gnuplot

use gnuplot tool. This is the default in one and two dimension.

-mayavi

use mayavi tool. This is the default for tridimensional geometries.

-color

-gray

-black-and-white

-bw

Use (color/gray scale/black and white) rendering. Color rendering is the default.

-elevation

-noelevation

For two dimensional field, represent values as elevation in the third dimension. The default is no evelation.

-scale float

applies a multiplicative factor to the field. This is useful e.g. in conjonction with the elevation option. The default value is 1.

-stereo

-nostereo

Rendering mode suitable for red-blue anaglyph 3D stereoscopic glasses. This option is only available with mayavi.

-fill

isoline intervals are filled with color. This is the default.

-nofill

draw isolines by using lines.

-cut

-nocut

Cut by a specified plane. The cutting plane is specified by its origin point and normal vector. This option requires the mayavi code.

-origin float [float [float]]

set the origin of the cutting plane. Default is (0.5, 0.5, 0.5).

-normal float [float [float]]

set the normal of the cutting plane. Default is (1, 0, 0).

-iso [float]

do draw 3d isosurface. When the optional float is not provided, a median value is used. This option requires the mayavi code.

-noiso

do not draw isosurface.

-n-iso int

For 2D visualizations, the isovalue table contains regularly spaced values from fmin to fmax, the bounds of the field.

-proj

Convert all selected fields to Pk-continuous approximation by using a L2 projection.

-round [float]

Round the input up to the specifiexd precision. This option, combined with -field, leads to a round filter. Usefull for non-regression test purpose, in order to compare numerical results between files with a limited precision, since the full double precision is machine-dependent.

-n-iso-negative int

The isovalue table is splitted into negatives and positives values. Assume there is n_iso=15 isolines: if 4 is requested by this option, then, there will be 4 negatives isolines, regularly spaced from fmin to 0 and 11=15-4 positive isolines, regularly spaced from 0 to fmax. This option is usefull when plotting e.g. vorticity or stream functions, where the sign of the field is representative.

-subdivide int

When using a high order geometry, the number of points per edge used to draw a curved element. Default value is the mesh order.

-deformation

Render vector-valued fields as deformed mesh using mayavi or gnuplot. This is the default vector field representation.

-velocity

Render vector-valued fields as arrows using mayavi.

-comp int

-comp string

Extract the i-th component of a vector-valued field. For a tensor-valued field, indexing components as "00", "01", "11"... is supported.

-domain name

Reduce the visualization to the specified domain.

-verbose

print messages related to graphic files created and command system calls (this is the default).

-noverbose

does not print previous messages.

-clean

clear temporary graphic files (this is the default).

-noclean

does not clear temporary graphic files.

-execute

execute graphic command (this is the default).

-noexecute

does not execute graphic command. Generates only graphic files. This is usefull in conjuction with the -noclean command.

It contains a header and a list values at degrees of freedom. The header contains the field keyword followed by a line containing a format version number (presently 1), the number of degrees of freedom (i.e. the number of values listed), the mesh file name without the `.geo' extension the approximation (e.g. P1, P2, etc), and finaly the list of values: A sample field file (compatible with the sample mesh example presented in command manual; see geo(1)) writes:

        field
        1 4
        square
        P1
        0.0
        1.0
        2.0
        3.0

    field cube.field -cut -normal 0 1 0 -origin 0.5 0.5 0.5 -vtk

This command send to vtk the cutted 2d plane of the 3d field.

    field cube.field -cut -normal 0 1 0 -origin 0.5 0.5 0.5 -text > cube-cut.field

This command generates the cutted 2d field and its associated mesh.

    field cube.field -iso 0.5 -plotmtv

This command draws the isosurface.

    field cube.field -iso 0.5 -text > isosurf.geo

This command generates the isosurface as a 3d surface mesh in `.geo' format. This is suitable for others treatments.

TODO

TODO

TODO

catchmark(4), geo(1)