dolfin team mailing list archive

[Anders Logg <logg@xxxxxxxxx>]

B11;rgb:0000/0000/0000On Tue, Sep 20, 2011 at 08:49:13AM -0700, Johan Hake wrote:
> On Tuesday September 20 2011 08:45:01 Garth N. Wells wrote:
> > On 20 September 2011 16:37, Johan Hake <johan.hake@xxxxxxxxx> wrote:
> > > Ok, sounds promising!
> > >
> > > Just to get it straight:
> > >
> > >  1) The old MeshFunction file format will not be supported in parallel
> >
> > Even better - your old file won't work in serial! The MeshFunction
> > output is flawed (for edges and faces) because the edge and facet
> > numbering is not specified by the mesh file. Edge and face numbering
> > is determined by the library that constructs a mesh. The new format
> > will be the same in serial and parallel.
>
> Well, if you use the library (DOLFIN) to generate your MeshFunction you are
> safe.

Not really, since it may break if we make some optimizations in
TopologyComputation that happen to change the order in which we
create edges and faces.

--
Anders


> > >  2) To read a MeshFunction from file in parallel I need to convert
> > >     all my MeshFunctions to MeshValueCollections and store them. Then I
> > > use that file to initiate a MeshFunction in parallel?
> >
> > I'll add something so if you read and old-style MeshFunction, and then
> > write it to file, it will be written in the new  format.
>
> So the file format of MeshValueCollection and MeshFunction will now be the
> same?


> Johan
>
> > Garth
> >
> > > Doable!
> > >
> > > Johan
> > >
> > > On Tuesday September 20 2011 01:17:25 Garth N. Wells wrote:
> > >> On 20 September 2011 07:10, Anders Logg <logg@xxxxxxxxx> wrote:
> > >> > MeshFunctions? I think MeshValueCollection works but not yet
> > >> > MeshFunctions.
> > >> >
> > >> > My suggestion is to either store MeshFunctions as
> > >> > MeshValueCollections:
> > >> >
> > >> >  <mesh_function>
> > >> >    <mesh_value_collection>
> > >> >    </mesh_value_collection>
> > >> >  </mesh_function>
> > >> >
> > >> > (when dim is not 0 or D) or to say that parallel I/O for MeshFunction
> > >> > is not supported and make the conversion between MeshFunction and
> > >> > MeshValueCollection easy (constructors).
> > >>
> > >> I think that the suggestion to store MeshFunctions as
> > >> MeshValueCollections is the best solution. To keep it simple, I would
> > >> use MeshValueCollection for entities of any dimension with a tweak of
> > >> the tags for vertices.
> > >>
> > >> The tools are in place to read MeshValueCollections from a separate
> > >> file. Just a few small additions are required to make it
> > >> work (right now the domain data needs to be in the mesh file). Once
> > >> this is in place reading MeshFunctions should be easy. I'll add the
> > >> code today.
> > >>
> > >> Garth
> > >>
> > >> >> It seems to work now!
> > >> >>
> > >> >> Kent
> > >> >>
> > >> >> On 20 September 2011 01:06, Johan Hake <johan.hake@xxxxxxxxx> wrote:
> > >> >>      How far are we from a functional reading of MeshFunctions in
> > >> >>      parallel?
> > >> >>
> > >> >>      Johan
> > >> >>
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