SYNOPSIS

branch [options] filename

---

EXAMPLE

Generates vtk file colection for visualization with paraview:

        branch output.branch -paraview

DESCRIPTION

Read and output a branch of finite element fields from file, in field text file format.

INPUT FILE SPECIFICATION

-Idir

add dir to the RHEOPATH search path. See also geo(2) for RHEOPATH mechanism.

filename

specifies the name of the file containing the input field.

-

read field on standard input instead on a file.

-ndigit int

Number of digits used to print floating point values when using the `-geo' option. Default depends upon the machine precision associated to the Float type.

INQUIRE

-toc

print the table of contents (toc) to standard output and exit.

OUTPUT AND RENDER SPECIFICATION

-extract int

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

-branch

Output on stdout in `.branch' format. This is the default.

-paraview

Generate a collection of vtk files for using paraview.

-vtk

Generate a single vtk file with numbered fields.

-gnuplot

Run 1d animation using gnuplot.

-plotmtv

This driver is unsupported for animations.

OTHER OPTIONS

-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 tridimensionnal elevation view based on the topographic data.

-proj

performs a P1 projection on the fly. This option is useful when rendering P0 data while vtk render requieres P1 description.

-elevation

For two dimensional field, represent values as elevation in the third dimension. This is the default.

-noelevation

Prevent from the elevation representation.

-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.

-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.

BRANCH FILE FORMAT

The `.branch' file format bases on the `.field' one:

       EXAMPLE          GENERAL FORM
        #!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 name is here time, but could be any string (without spaces). The previous example contains one field at each time step. Labels appears all along the file to facilitate direct jumps and field and step skips.

The format supports several fields, such as (t,u(t),p(t)), where u could be a multi-component (e.g. a vector) field:

        #!branch
        branch
          1 2 11
          time u p
          #time 3.14
          #u
          mfield
          1 2
          #u0
          field
          ...
          #u1
          field
          ...
          #p
          #time 6.28
          ...