On 6/30/06, John Peterson <peterson@cfdlab.ae.utexas.edu> wrote:
David Xu writes:
> On 6/29/06, John Peterson <peterson@cfdlab.ae.utexas.edu> wrote:
> >
> > Roy Stogner writes:
> > > On Thu, 29 Jun 2006, David Xu wrote:
> > >
> > > > When I was trying to generate 3D tetrahedral mesh using:
> > > >
> > > > MeshTools::Generation::build_cube (mesh, 20, 20, 20, -3., 3., -3., 3.,
> > -3.,
> > > > 3., TET10);
> > > >
> > > > I got:
> > > >
> > > > ERROR: Unrecognized 3D element type.
> > > > [0] src/mesh/mesh_generation.C, line 671, compiled Jun 13 2006 at
> > 23:07:35
> > > >
> > > > I thought TET4 and TET10 elements were implemented in libmesh because
> > they
> > > > are listed under Generic 3D Finite Elements of libmesh Class DOCs
> > > > http://libmesh.sourceforge.net/doxygen/index.php
> > >
> > > Unfortunately, "implemented in libMesh" doesn't always mean
> > > "implemented in every single libMesh function".  libMesh currently
> > > supports finite element calculations on tetrahedra with linear or
> > > quadratic Lagrange elements, but you need to be able to supply your
> > > own tet mesh (or get one out of tetgen, now).
> > >
> > > "Unrecognized 3D element type" is a misleading error message there;
> > > perhaps we should change it to something like "3D element type X is
> > > not supported by function Y".
> > >
> > > John Peterson has recently written some code that let him build cubes
> > > of tetrahedra, but I don't know if it's debugged and ready to add to
> > > CVS yet.
> >
> > I think TET4 and TET10 are supported by build_cube in the CVS version.
> > Note also that it works by creating 24 tets from each hex in an initial
> > mesh of (in your case) 20x20x20 hexes.  That's probably way too many tets!
> >
> > my libmesh was built on the cvs version and I still got
> ERROR: Unrecognized 3D element type.
>
> I downloaded libmesh thru cvs on 6/12, was there any update since then?


Wouldn't it just be easier to type cvs update instead of sending
this email?

Thanks, John. I updated cvs and recomplied limesh. Tried TET10 on a cube and it seemed to work fine.  I got this line from output:

Second derivatives for 2D Lagrangian TET10 elements are not yet implemented!

Does this affect anything?