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# 50. `tetgen` — Interface with tetgen

A collection of functions to read/write tetgen files and to run the tetgen program

tetgen is a quality tetrahedral mesh generator and a 3D Delaunay triangulator. See http://tetgen.org

`Classes defined in module tetgen`

`Functions defined in module tetgen`

`tetgen.``readNodeFile`(fn)

  Read a tetgen .node file.

  Returns a tuple as described in readNodesBlock.

`tetgen.``readEleFile`(fn)

  Read a tetgen .ele file.

  Returns a tuple as described in readElemsBlock.

`tetgen.``readFaceFile`(fn)

  Read a tetgen .face file.

  Returns a tuple as described in readFacesBlock.

`tetgen.``readSmeshFile`(fn)

  Read a tetgen .smesh file.

  Returns an array of triangle elements.

`tetgen.``readPolyFile`(fn)

  Read a tetgen .poly file.

  Returns an array of triangle elements.

`tetgen.``readSurface`(fn)

  Read a tetgen surface from a .node/.face file pair.

  The given filename is either the .node or .face file. Returns a tuple of (nodes,elems).

`tetgen.``skipComments`(fil)

  Skip comments and blank lines on a tetgen file.

  Reads from a file until the first non-comment and non-empty line. Then returns the non-empty, non-comment line, stripped from possible trailing comments. Returns None if end of file is reached.

`tetgen.``stripLine`(line)

  Strip blanks, newline and comments from a line of text.

`tetgen.``getInts`(line, nint)

  Read a number of ints from a line, adding zero for omitted values.

  line is a string with b;anks separated integer values. Returns a list of nint integers. The trailing ones are set to zero if the strings contains less values.

`tetgen.``addElem`(elems, nrs, e, n, nplex)

  Add an element to a collection.

`tetgen.``readNodesBlock`(fil, npts, ndim, nattr, nbmark)

  Read a tetgen nodes block.

  Returns a tuple with:

  - coords: Coords array with nodal coordinates
  - nrs: node numbers
  - attr: node attributes
  - bmrk: node boundary marker

  The last two may be None.

`tetgen.``readElemsBlock`(fil, nelems, nplex, nattr)

  Read a tetgen elems block.

  Returns a tuple with:

  - elems: Connectivity of type ‘tet4’ or ‘tet10’
  - nrs: the element numbers
  - attr: the element attributes

  The last can be None.

`tetgen.``readFacesBlock`(fil, nelems, nbmark)

  Read a tetgen faces block.

  Returns a a tuple with:

  - elems: Connectivity of type ‘tri3’
  - nrs: face numbers
  - bmrk: face boundary marker

  The last can be None.

`tetgen.``readSmeshFacetsBlock`(fil, nfacets, nbmark)

  Read a tetgen .smesh facets bock.

  Returns a tuple of dictionaries with plexitudes as keys:

  - elems: for each plexitude a Connectivity array
  - nrs: for each plexitude a list of element numbers in corresponding elems

`tetgen.``readNeigh`(fn)

  Read a tetgen .neigh file.

  Returns an arrays containing the tetrahedra neighbours:

`tetgen.``writeNodes`(fn, coords, offset=0)

  Write a tetgen .node file.

`tetgen.``writeSmesh`(fn, facets, coords=None, holes=None, regions=None)

  Write a tetgen .smesh file.

  Currently it only writes the facets of a triangular surface mesh. Coords should be written independently to a .node file.

`tetgen.``writeSurface`(fn, coords, elems)

  Write a tetgen surface model to .node and .smesh files.

  The provided file name is the .node or the .smesh filename.

`tetgen.``nextFilename`(fn)

  Returns the next file name in a family of tetgen file names.

`tetgen.``runTetgen`(fn, options='')

  Run tetgen mesher on the specified file.

  The input file is a closed triangulated surface. tetgen will generate a volume tetraeder mesh inside the surface, and create a new approximation of the surface as a by-product.

`tetgen.``readTetgen`(fn)

  Read and draw a tetgen file.

  This is an experimental function for the geometry import menu.

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