Pointwise [http://www.pointwise.com/] is a Texan company specialized in grid generation and pre-processing for 
CFD (Computational Fluids Dynamics).
Its major product (Gridgen) embeds a Tcl-Tk based scripting language called GridgenGlyph [http://www.pointwise.com/gridgen/script.shtml]. 
It provides customization capabilities covering the entire range of functionality available 
in Gridgen for commands and GUIs.

[http://www.pointwise.com/images/axial-tk-200.gif] [http://www.pointwise.com/images/port-tk-137.gif]

- Script samples are available here [http://www.pointwise.com/glyph/]

- See also this article ''Automating Mesh Genration Through Scripting'' [http://www.cfd-beratung.de/PDF/FS_script.pdf] (pdf)

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