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field(1rheolef) rheolef-7.0 field(1rheolef)

NAME

field -- plot a field

SYNOPSIS

        field options filename[.field[.gz]]

DESCRIPTION

Read and output a finite element field from file.

EXAMPLE

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

INPUT FILE SPECIFICATION

filename
specifies the name of the file containing the input field.

-
read field on standard input instead on a file.
-name
when the field comes from standard input, the file base name is not known and is set to "output" by default. This option allows one to change this default. Useful when dealing with output formats (graphic, format conversion) that creates auxiliary files, based on this name.
-Idir
-I dir
Add dir to the rheolef file search path. This option is useful 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.

-mark string
-catch string
-catchmark string
Jump across the file to the specifield string. Label start at the beginning of a line, preceded by a `#' mark (see see catchmark(4)).

OUTPUT FILE FORMAT OPTIONS

-text
-field
output field on standard output stream in Rheolef ascii (field or geo) 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, tif, ppm, bmp or vectorial pdf, eps, ps, svg image file formats. this option can be used with the paraview and the gnuplot renders. The output file is e.g. basename.png when basename is the name of the mesh, or can be set with the -name option.
-resolution int int
The argument is a couple of sizes, for the image resolution. This option can be used together with the -image-format for any of the bitmap image formats. This option requires the paraview render.

GETTING INFORMATION

-min
-max
print the min (resp. max) value of the scalar field and then exit.
-get-geo
print the name of the mesh associated to the field and exit.

RENDER OPTIONS

-gnuplot
use gnuplot tool. This is the default in one dimension.
-paraview
use paraview tool. This is the default for two- and tri-dimensional geometries.
-mayavi
use mayavi tool. This is maintained for backward compatibility purpose: it has been supersetted by the paraview render.

RENDERING OPTIONS

-color
-gray
-black-and-white
-bw
Use (color/gray scale/black and white) rendering. Color rendering is the default.
-label
-nolabel
Show or hide title, color bar and various anotations. Default is to show labels.
-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 and paraview.
-fill
isoline intervals are filled with color. This is the default.
-nofill
draw isolines by using lines.
-volume
-novolume
for 3D data, render values using a colored translucid volume. This option requires the paraview code.
-cut
-nocut
Cut by a specified plane. The cutting plane is specified by its origin point and normal vector. This option requires the paraview 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 paraview 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 approx
Convert all selected fields to approximation approx by using a L2 projection.
-proj
Convert all selected fields to Pk-continuous approximation by using a L2 projection.
-lumped-proj
Force P1 approximation for L2 projection and use a lumped mass matrix for it.
-round [float]
Round the input up to the specified precision. This option, combined with -field, leads to a round filter. Useful 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 split 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 useful 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, paraview or gnuplot. This is the default vector field representation.

-velocity
Render vector-valued fields as arrows using mayavi or paraview.

COMPONENT EXTRACTION AND DOMAIN REDUCTION

-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.

OTHERS OPTIONS

-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 useful in conjunction with the -noclean command.

FIELD FILE FORMAT

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 finally 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

EXAMPLES

    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
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.

SEE ALSO

catchmark(4), geo(1)

COPYRIGHT

Copyright (C) 2000-2018 Pierre Saramito <Pierre.Saramito@imag.fr> GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>. This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law.
rheolef-7.0 rheolef-7.0