dolfin team mailing list archive

[Benjamin Kehlet <benjamik@xxxxxxxxx>]

2012/11/20 Johan Hake <hake.dev@xxxxxxxxx>

> On 11/15/2012 10:07 AM, Garth N. Wells wrote:
> > On Thu, Nov 15, 2012 at 8:58 AM, Johan Hake <hake.dev@xxxxxxxxx> wrote:
> >> On 11/14/2012 09:51 AM, Benjamin Kehlet wrote:
> >>> 2012/11/14 Anders Logg <logg@xxxxxxxxx <mailto:logg@xxxxxxxxx>>
> >>>
> >>>     Dear all,
> >>>
> >>>     The plot and csg branches have been merged into trunk. Please try
> out
> >>>     the new functionality for mesh generation (from both CSG
> descriptions
> >>>     and input files) and plotting and report any problems.
> >>>
> >>>     All thanks to very good work from Benjamin, Joachim and Johannes.
> >>>
> >>>
> >>> It is a little bit early to applaud. There are some issues with the csg
> >>> stuff that need to be fixed, so mesh generation (in particular in 3D)
> is
> >>> likely to crash.  I've have pushed everything to trunk, though, since
> >>> some of the plotting code depends on parts of the csg code.
> >>
> >> It crashes, but almost randomly. The same script (3D demo) sometime
> >> generate a nice mesh, other times a crappy one, and sometimes just
> crash.
> >>
> >>> Will report back when this has been fixed.
> >>
> >> What is the main cause for this erratic behavior?
> >>
> >
> > I observed erratic behaviour with CGAL <= 4.0.2 + gcc before the CSG
> > merge (this also showed up with the buildbots, with the CGAL-based
> > mesh generation failing randomly), but it's been very reliable with
> > CGAL 4.2 + gcc 4.7.
>
> I guess you mean CGAL 4.1?
>
> I have now upgraded to CGAL 4.1 and gcc4.7 and it is actually less
> reliable. Now I have not got any mesh out of the 3D python demo.
> Previously I got some 1 out of 4 runs.
>

Does it crash or end up in an infinite loop?

I'm working on testing the polyhedrons that are used as input for the mesh
generator for self intersections (which is what cause most of the problems
I experience). I will push that to a separate branch probably later today.
Maybe you can try running the demo with this test then. I'm also working on
removing the self intersections.

Benjamin


>
> Johan
>
> > Garth
> >
> >> Johan
> >>
> >>> Benjamin
> >>>
> >>>
> >>>     --
> >>>     Anders
> >>>
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> >>>
> >>>
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> >>
> >>
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