branch(1rheolef)                    rheolef                   branch(1rheolef)

       branch - handle a family of fields (rheolef-7.1)

       branch [options] file[.branch[.gz]]

       Run an animation:

           branch file.branch

       It uses either gnuplot, for 1d geometries, or paraview, otherwise.

       Next, let us extract the 17-th indexed and save it in .field file
       format. Indexes started at 0:

           branch file.branch -extract 17 -branch > file-17.field

       Read and visualize or output a branch of finite element fields from


           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 useful e.g.
           when the mesh .geo and the .field files 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.


           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.

       -if format
       -input-format format

           Load a mesh in the prescribed file format. Supported input file
           formats are: .branch and .vtk.


           Run a 1d animation using gnuplot.


           Run 2d and 3d animations using paraview. Generate a collections of
           .vtk files and a main .py python one, then execute the python file.


           Do not regenerate the collection of .vtk files when using the
           paraview render. Only generate the main .py python file and execute
           it. Assume that all the .vtk files was already created with the
           -vtk option or with -paraview one combined with -noclean.


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


           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.


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


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


           For 3D data, render values using a colored translucid volume. This
           option requires the paraview code.

       -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.


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


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

       -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


           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.


           Generate a collection of .vtk files for paraview.


           Output on stdout in .branch format.

       -extract int
       -index int

           Extract the i-th record in the file. The output is a field or
           multi-field file format. Indexes started at 0.


           Print the table of contents (toc) to standard output and exit. Each
           index value is followed by the associated value (e.g. the time or a
           physical parameter).

       -ndigit int

           Number of digits used to print floating point values when using the
           -branch option. Note that the default value depends upon the
           machine precision associated to the Float type, as defined by the
           configure script during the installation of the library (see
           configuration). When Float is double, then 16 digits are used by
           default. This default value can be changed by this option, e.g. for
           the portability of non-regression tests.

       -image-format string

           For image or video capture. The supported argument are .avi, .jpg,
           .png, .tif and .bmp.

       This option should be combined with the paraview render. The output
       file is basename.avi 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.

       -umin float
       -umax float

           Set the solution range for the gnuplot driver. By default this
           range is computed from the first field of the branch, and this
           could be problematic when this field is initialy zero.

       `-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.

       -topography filename[.field[.gz]]

           Performs a tridimensional elevation view based on the topographic


           Performs a P1 projection on the fly. This option is useful when
           rendering P0 data while the paraview render requires P1


           Force P1 approximation for L2 projection and use a lumped mass
           matrix for it.


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


           Clear temporary graphic files (this is the default).


           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.

       For conversion from the .vtk legacy ascii file format to the .branch
       one, simply writes:

           branch -if vtk -branch - < input.vtk > output.branch

       The .branch file format bases on the .field one (see field(1) ):

           example        | general format
           #!branch       | #!branch
           branch         | branch
           1 1 11         | <version> <nfield=1> <nvalue=N>
           time u         | <key> <field name>
           #time 3.14     | #<key> <key value 1>
           #u             | #<field name>
           field          | <field 1>
           .....          | ....
           .....          | ....
           #time 6.28     | #<key> <key value N>
           #u             | #<field name>
           field          | <field N>
           .....          |  ....

       The key is here time, but could be any string without spaces, such as t
       or lambda. Labels appears all along the file to facilitate direct jumps
       and field and step skips.

       The previous example contained one field at each time step. The format
       supports several fields, such as (t,u(t),p(t)), where u could be a
       multi-component field (e.g. a vector):

           1 2 11
           time u p

           #time 3.14
           #time 6.28

       This documentation has been generated from file main/bin/

       Pierre  Saramito  <>

       Copyright   (C)  2000-2018  Pierre  Saramito  <>
       GPLv3+: GNU GPL version 3 or later  <>.
       This  is  free  software:  you  are free to change and redistribute it.
       There is NO WARRANTY, to the extent permitted by law.

Version 7.1                     Sun Mar 22 2020               branch(1rheolef)