[Gmsh] PostView format and background mesh

[j s]

Thanks for your response. What is the format for characteristic? The
example online, bgmesh.pos,  has 3 values. What do they mean?
On Jul 29, 2013 7:17 PM, "Geordie McBain" <gdmcbain at freeshell.org> wrote:

> 2013/7/30 j s <j.s4403 at gmail.com>:
> > Hello,
> >
> > I would like to create a background mesh using the postview format.
> > Is there documentation for this format online?
> >
> > I found bgmesh.pos here:
> >
> http://fossies.org/linux/privat/gmsh-2.8.2-source.tgz:a/gmsh-2.8.2-source/tutorial/bgmesh.pos
> >
> > For 2D, and 3D, can I just use Node Values (1 coordinate per
> > characteristic length)?
> >
> > Are the 3 values for each coordinate "node" characteristic lengths or
> > "direction" coordinate lengths?
> >
> > It took me a while to discover from the online manual that the "pos"
> > extension has nothing to do with the legacy format?
>
> Rather that try and understand another format, when I wanted to do the
> same thing (create a background mesh), I saved my data in the .msh
> format (which I already understood, following its description in the
> manual) and then used Gmsh to convert it from .msh to .pos.
>
> Specifically, I use a couple of Make-rules:
>
> #%<--
> %.geo: %.msh
>         @echo "Merge '$<';\nSave View[0] '$(subst msh,pos,$<)';" > $@
> %.pos: %.geo %.msh
>         gmsh -0 $<
>         @rm -f $(subst geo,geo_unrolled,$<)
> #--->%
>
> But you don't need Make; basically, given data in data.msh, write
> data.geo which contains
>
> #%<---
> Merge 'data.msh';
> Save View[0] 'data.pos';
> #--->%
>
> and call it with "gmsh -0 data.1.geo" from the command line. This
> produces data.pos, which is what is sought, and data.geo_unrolled,
> which can be ignored and discarded.
>
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