dolfin team mailing list archive

[Anders Logg <logg@xxxxxxxxx>]

On Mon, Oct 19, 2009 at 11:27:53AM +0100, Garth N. Wells wrote:
>
>
> Andre Massing wrote:
> > Hi,
> >
> > I am just wondering why GTS has been only optional in the past, although
> > the eval function
> >
> > void Function::eval(double* values, const double* x) const
> > http://www.fenics.org/hg/dolfin/file/32bcc3b91dd7/dolfin/function/Function.cpp#l243
> >
> > in the Function class depends on the IntersectionDetector, which in turn
> > depends on GTS.
> >
>
> GTS was added before eval(double* values, const double* x) for finite
> element functions was added and we haven't bothered reconsidering
> whether or not GTS should be an optional dependency sicne. Most demos
> should run without GTS.
>
> > Furthermore a 1D function can not evaluated at arbitrary points for
> > functions  on 1D grids since the the IntervalCell class
> >
> > http://www.fenics.org/hg/dolfin/file/32bcc3b91dd7/dolfin/mesh/IntervalCell.cpp#l183
> >
> > does not provide a implementation.
> >
> > So I wondering how these things work instead? At least I could not find
> > it in the docs and my benchmarks throw an exception when I tried to run
> > the old IntersectionDetector for 1D meshes and points intersection.
> >
>
> Probably never been tested before.
>
> Garth
>
> > (Of course the forthcoming CGAL interface will remedy these issues
> ;))

Even so, it would probably be best to make CGAL optional since it may
be a heavy dependency. We can throw a sensible error message when CGAL
is not installed. It would be good to make it possible to install
DOLFIN on a Debian-based system with the only extra dependencies being
other FEniCS packages.

When CGAL 3.5 is in Debian, we can make it a dependency.

--
Anders


> > Greetings,
> > Andre
> > _______________________________________________
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>
>
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