dolfin team mailing list archive

[Anders Logg <logg@xxxxxxxxx>]

On Tue, Jun 16, 2009 at 09:12:02AM +0200, Johan Hoffman wrote:
> > On 15/06/09 10:21 PM, Jehanzeb Hameed wrote:
> >> Hello,
> >>
> >> Is there a function I can hook into LocalMeshRefinement (or elsewhere)
> >> which allows me to define the rule for edge-bisection? This would be
> >> handy, e.g. if we knew our mesh was a sphere, then points on boundary
> >> can be pushed off differently so that they always lie on the sphere.
> >>
> >>
> > As far as I know Dolfin doesn't support any other description of solid
> > different than just Mesh. This means that there is no way to follow
> > shape of the boundary during refinement.
> > This would be nice to have such feature, but I can't imagine
> > implementing it without having advanced meshing core with support for
> > CSG or something similar.
> >
> > If you really need a smooth sphere, I would just change the code of
> > RivaraRefinement.cpp (see line 264, where new point is defined). For
> > sphere is quite simple, to predict where the point should be located.
> >
> > cheers
> > BArtek
> 
> The simplified cases of cylinders and spheres are available today in Unicorn:
> http://www.fenics.org/wiki/Unicorn
> 
> We are currently developing the general case of projection of the mesh
> onto an exact geometry, where the exact geometry can be represented e.g.
> as a NURBS surface, which I expect will be in place after the summer.

Will this be in DOLFIN or in Unicorn?

-- 
Anders


> Also, different variants of local mesh refiement (such as the Rivara
> algorithm) is available today in Unicorn, including a distributed parallel
> version using MPI.
> 
> For a continuing discussion on Unicorn, there is a dedicated mailing list:
> unicorn-dev@xxxxxxxxxx
> 
> All the best,
> Johan
> 
> 
> 
> 
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