field - plot a field (rheolef-7.2)
field [options] file[.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.
-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 specified
string . Label start at the
beginning of a line, preceded by a #
mark (see
catchmark(3)).
-field -text
Output field on standard output stream in Rheolef ascii (field or geo) text
file format.
-gmsh
Output field on standard output stream in .gmsh file format.
-gmsh-pos
Output field on standard output stream in .gmsh-pos 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
For image or video capture. The supported argument are .jpg, .png,
.tif and .bmp. This option should be combined with the paraview
render. The output file is basename.png where basename is the
name of the mesh, or can be set with the -name option.
-resolution int int
For the resolution of an image or a video capture. The argument is a couple of
sizes, separated by a white space. This option can be used together with the
-image-format for any of the bitmap image formats. This option requires the
paraview render.
-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.
-gnuplot
Use the gnuplot tool. This is the default in one dimension.
-paraview
Use the paraview tool. This is the default for two- and tri-dimensional
geometries.
-color
-gray
-black-and-white
-bw
Use (color/gray scale/black and white) rendering. Color rendering is the
default.
-[no]showlabel
Show or hide title, color bar and various annotations. Default is to show
labels.
`-label string
Set the label to show for the represented value. This supersedes the default
value.
-[no]elevation
For two dimensional field, represent values as elevation in the third
dimension. The default is no elevation.
-scale float
Applies a multiplicative factor to the field. This is useful e.g. in
conjunction with the elevation option. The default value is 1.
-[no]stereo
Rendering mode suitable for red-blue anaglyph 3D stereoscopic glasses. This
option is only available with paraview.
-[no]fill
Isoline intervals are filled with color. This is the default. When -nofill,
draw isolines by using lines.
-[no]volume
For 3D data, render values using a colored translucid volume. This option
requires the paraview code.
-[no]cut
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).
-isovalue [float]
-iso [float]
Draw 2d isoline or 3d isosurface. When the optional float is not provided, a
median value is used. This option requires the paraview code.
-noisovalue
Do not draw isosurface. This is the default.
-n-iso int
For 2D visualizations, the isovalue table contains regularly spaced values from
fmin to fmax, the bounds of the field.
-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.
-proj approx -proj
Convert all selected fields to approximation approx by using a L2
projection. When argument is omitted, P1 approximation is
assumed.
-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.
-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 -velocity
Render vector-valued fields as deformed mesh using paraview or gnuplot.
This is the default vector field representation. When velocity, render
vector-valued fields as arrows using paraview instead.
-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 name.
-[no]verbose
Print messages related to graphic files created and command system calls (this
is the default).
`-[no]clean
Clear temporary graphic files (this is the default).
-[no]execute
Execute graphic command (this is the default). The -noexecute variant is
useful in conjunction with the -verbose and -noclean options in order
to modify some render options by hand.
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 write
field
1 4
square
P1
0.0
1.0
2.0
3.0
See also geo(1) for the .geo mesh file format.
The following command send to vtk the cuted 2d plane of the 3d
field:
field cube.field -cut -normal 0 1 0 -origin 0.5 0.5 0.5 -vtk
Next, let us generate the cuted 2d field and its associated mesh:
field cube.field -cut -normal 0 1 0 -origin 0.5 0.5 0.5 -text > cube-cut.field
For drawing the isosurface:
field cube.field -isovalue 0.5
Finally, let us generate the isosurface as a 3d surface mesh in the .geo
file format:
field cube.field -isovalue 0.5 -text > isosurf.geo
This file is then suitable for others treatments.
This documentation has been generated from file
main/bin/field.cc
Pierre Saramito <Pierre.Saramito@imag.fr>
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.