dolfin team mailing list archive

[Anders Logg <logg@xxxxxxxxx>]

On Tue, May 15, 2007 at 06:42:18PM +0200, Johan Jansson wrote:
> > Johan H., Johan J.,
> >
> > Could you add a demo for the projection of a function onto different
> > meshes? I'd really like to see how it works.
> >
> > Garth
> 
> Hi!
> 
> There is such a demo in:
> 
> src/demo/fem/nonmatching

Does not exist.

> also in:
> 
> src/demo/pydolfin/projection/verification
> src/demo/pydolfin/projection/nonmatching-continuous
> src/demo/pydolfin/projection/nonmatching-discontinuous

None of these work.

> A mesh refinement/coarsening demo exists in:
> 
> src/demo/mesh

Moved to src/demo/mesh/refinement and I don't think it works, but it
does do a lot of printing and says "mesh not ok" :-)

> Note that I haven't tested these demos with the dolfin repository version
> for a while, I'll try to do that in the near future. Also note that there
> is still a major (but quite simple) optimization left for the projection -
> to exploit that we know which cell of the target mesh we are on when
> evaluating functions on the source mesh (we only have to search through
> the intersecting cells and not the whole mesh). So currently the time
> complexity is not very good, but the implementation is robust.
> 
>   Johan

Sounds good.

/Anders