dolfin team mailing list archive

["Garth N. Wells" <gnw20@xxxxxxxxx>]

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.

>  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.

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
>>
>> > --
>> > Anders
>> >
>> > On Tue, Sep 20, 2011 at 07:58:31AM +0200, Kent-Andre Mardal wrote:
>> >> 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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