dolfin team mailing list archive

[Anders Logg <logg@xxxxxxxxx>]

On Thu, Dec 07, 2006 at 09:03:51AM +0100, Johan Hoffman wrote:
> > On Wed, Dec 06, 2006 at 03:37:04PM +0100, Johan Hoffman wrote:
> >> I'm going through the ordering of mesh entities for the reference
> >> tetrahedron in the Manual, and I get confused about the ordering of
> >> vertices on the faces (page 83-84). It says that vertices are ordered
> >> counter-clockwise on the face seen from outside the tetrahedron. As far
> >> as
> >> I can see they are ordered clockwise? Or?
> >>
> >> This possible error then also propagates to the numbering of edges on
> >> each
> >> face.
> >>
> >> As far as I can see, the numbering is consistent if "counter-clockwise"
> >> is
> >> changed into "clockwise"?
> >>
> >> /Johan
> >
> > Correct! There is a bug in the manual. :-/
> >
> > /Anders
> 
> Ok. And what is the implementation? Clockwise or couter-clockwise?

In FFC it's clockwise from the outside as in the manual (following the
figures). But the DOLFIN mesh does currently not sort or reorder the
entities locally. This is probably something we need to put in.

/Anders