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File Formats

The following file-formats are available to store or read geometric entities:

- fbd-format, this format consists of a collection of commands explained in the section ''Commands'' and it is mainly used to store geometrical information like points, lines, surfaces and bodies. But it can also be used to define a batch job which uses the available commands.
- step-format, reverse engineered based on some 2D-NX5 files. Only points and certain types of lines are supported currently.
- stl-format, this format describes a shape using only triangles (see the read command to handle edges generated by NETGEN).

Common CAD formats are supported by stand-alone interfaces which translate into fbd-commands.
The following file-formats are available to write a mesh and certain boundary-conditions:

- Abaqus, which is also used by the CalculiX solver ccx.
- Ansys, most boundary conditions available.
- Code_Aster, small subset of boundary conditions available.
- Samcef, small subset of boundary conditions available.
- duns, a free cfd-code [5].
- isaac, a free cfd-code [6].
- OpenFOAM, a free cfd-code [7], only 8-noded brick-elements are supported.
- Nastran, most boundary conditions available.
- tochnog, a free fem-code [8], only 8-noded brick-elements are supported.

The following solver-input-file-format can be read to check the mesh and certain boundary-conditions:

- Abaqus, this is also used by the CalculiX solver ccx.

The following file-formats are available to read solver results:

- frd-format, files of this format are used to read results of previous calculations like displacements and stresses. This format is described in section ''Result Format.'' It is also used by ccx.
- duns, a free cfd-code [5],
- isaac, a free cfd-code [6],
- OpenFOAM, a free cfd-code [7].

For a more detailed description on how to use cgx to read this formats see ''Program Parameters.'' See the ''send'' command for how to write them from cgx.

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