Rheolef
7.2
an efficient C++ finite element environment
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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.
-I
dir
-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 variableRHEOPATH
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 (seecatchmark
).
-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 theparaview
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 theparaview
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* <blockquote>‍ Set the label to show for the represented value. This supersedes the default value. </blockquote>
-[no]elevation <blockquote>‍ For two dimensional field, represent values as elevation in the third dimension. The default is no elevation. </blockquote>
-scale*float* <blockquote>‍ Applies a multiplicative factor to the field. This is useful e.g. in conjunction with the
elevationoption. The default value is 1. </blockquote>
-[no]stereo <blockquote>‍ Rendering mode suitable for red-blue anaglyph 3D stereoscopic glasses. This option is only available with
paraview. </blockquote>
-[no]fill <blockquote>‍ Isoline intervals are filled with color. This is the default. When
-nofill, draw isolines by using lines. </blockquote>
-[no]volume <blockquote>‍ For 3D data, render values using a colored translucid volume. This option requires the
paraviewcode. </blockquote>
-[no]cut <blockquote>‍ Cut by a specified plane. The cutting plane is specified by its origin point and normal vector. This option requires the
paraviewcode. </blockquote>
-origin*float* [*float* [*float*]] <blockquote>‍ Set the origin of the cutting plane. Default is (0.5, 0.5, 0.5). </blockquote>
-normal*float* [*float* [*float*]] <blockquote>‍ Set the normal of the cutting plane. Default is (1, 0, 0). </blockquote>
-isovalue[*float*] \n
-iso[*float*] <blockquote>‍ Draw 2d isoline or 3d isosurface. When the optional float is not provided, a median value is used. This option requires the
paraviewcode. </blockquote>
-noisovalue <blockquote>‍ Do not draw isosurface. This is the default. </blockquote>
-n-iso*int* <blockquote>‍ For 2D visualizations, the isovalue table contains regularly spaced values from fmin to fmax, the bounds of the field. </blockquote> @addindex vorticity @addindex stream function
-n-iso-negative*int* <blockquote>‍ 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. </blockquote> @addindex projection @addindex approximation P1
-proj*approx*
-proj <blockquote>‍ Convert all selected fields to approximation *approx* by using a L2 projection. When argument is omitted,
P1approximation is assumed. </blockquote>
-lumped-proj <blockquote>‍ Force
P1approximation for L2 projection and use a lumped mass matrix for it. </blockquote>
-round[*float*] <blockquote>‍ 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. </blockquote>
-subdivide*int* <blockquote>‍ When using a high order geometry, the number of points per edge used to draw a curved element. Default value is the mesh order. </blockquote>
-deformation
-velocity <blockquote>‍ Render vector-valued fields as deformed mesh using
paraviewor
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
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