dolfin team mailing list archive

[Anders Logg <logg@xxxxxxxxx>]

On Wed, Jun 17, 2009 at 12:24:22PM +0200, Johan Hoffman wrote:
> > 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?
> 
> This is currently developed as a separate library by our msc thesis
> student Ashraful Kadir, I am not sure how this is best connected to
> FEniSC. We will also consider an alternative approach based on closer
> integration with Gmsh for the geometry.

ok.

Would it be possible to coordinate this work and the other mesh-related 
actitivies like refinement (MAdLib) and parallel assembly better with the
main DOLFIN tree? 

I know you like to work with "stable" DOLFIN snapshots but this
complicates merging.

-- 
Anders

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