about Unstructured Meshes

[li pan]

I always need complex geometry of different curves and
distorted surface. In my case, I found, Netgen
generates much better mesh. Just out of my curiousity.
How complicated is your geometry?

see u

pan


--- Matthew Knepley <knepley at gmail.com> wrote:

> On 3/4/07, li pan <li76pan at yahoo.com> wrote:
> > hi Matt,
> > have you ever evaluated Tetgen? How do you think
> about
> > the quality of the 3D mesh it generated?
> 
> I have heard anecdotes about failures for
> complicated geometry,
> however I have never had a problem. The quality is
> pretty good.
> Gary Miller has shown that the number of tets
> generated is way
> too high, but I know of no better implementation.
> 
>    Matt
> 
> > see u
> >
> > pan
> >
> >
> > --- Matthew Knepley <knepley at gmail.com> wrote:
> >
> > > On 3/2/07, Jianing Shi <jianings at gmail.com>
> wrote:
> > > > Well, let me rephrase my question.  So the
> mesh
> > > support in PETSc
> > > > already includes the functionality of
> partitioning
> > > meshes, I guess,
> > > > using ParMetis, is that the case?  Something
> that
> > > an end user need to
> > > > worry about is really how to generate a mesh
> that
> > > is tailored towards
> > > > his/her application.
> > >
> > > It can use a range of partioners, like Chaco for
> > > instance.
> > >
> > > > I am trying to write a library on top of PETSc
> > > meshes that will
> > > > generate meshes according to some
> neurophysiology.
> > >  I would like to
> > > > know what are the mesh generate softwares out
> > > there that will
> > > > interface nicely with PETSc, or if it makes
> sense
> > > for me to write my
> > > > own?  Just would like to understand more about
> the
> > > data structure in
> > > > the PETSc ALE::Mesh classes.  Is there any
> > > tutorial out there apart
> > > > from looking at the source code in the mesh
> > > directory?
> > >
> > > 1) No, it makes no sense for you to write a mesh
> > > generator
> > >
> > > 2) In 2D, Triangle. In 3d, the only free things
> are
> > > TetGen and Netgen. I support
> > >     TetGen. Hopefully, CMU will release its MG
> soon.
> > >
> > > There is a tutorial on the website.
> > >
> > > > I am currently using the petsc-2.3.2-p3.  Is
> there
> > > any new
> > > > functionality about meshes in the development
> > > version?
> > >
> > > All the working stuff is in petsc-dev.
> > >
> > >   Matt
> > >
> > > > Jianing
> > > --
> > > One trouble is that despite this system, anyone
> who
> > > reads journals widely
> > > and critically is forced to realize that there
> are
> > > scarcely any bars to eventual
> > > publication. There seems to be no study too
> > > fragmented, no hypothesis too
> > > trivial, no literature citation too biased or
> too
> > > egotistical, no design too
> > > warped, no methodology too bungled, no
> presentation
> > > of results too
> > > inaccurate, too obscure, and too contradictory,
> no
> > > analysis too self-serving,
> > > no argument too circular, no conclusions too
> > > trifling or too unjustified, and
> > > no grammar and syntax too offensive for a paper
> to
> > > end up in print. --
> > > Drummond Rennie
> > >
> > >
> >
> >
> >
> >
> >
>
____________________________________________________________________________________
> > Do you Yahoo!?
> > Everyone is raving about the all-new Yahoo! Mail
> beta.
> > http://new.mail.yahoo.com
> >
> >
> 
> 
> -- 
> One trouble is that despite this system, anyone who
> reads journals widely
> and critically is forced to realize that there are
> scarcely any bars to eventual
> publication. There seems to be no study too
> fragmented, no hypothesis too
> trivial, no literature citation too biased or too
> egotistical, no design too
> warped, no methodology too bungled, no presentation
> of results too
> inaccurate, too obscure, and too contradictory, no
> analysis too self-serving,
> no argument too circular, no conclusions too
> trifling or too unjustified, and
> no grammar and syntax too offensive for a paper to
> end up in print. --
> Drummond Rennie
> 
> 



 
____________________________________________________________________________________
8:00? 8:25? 8:40? Find a flick in no time 
with the Yahoo! Search movie showtime shortcut.
http://tools.search.yahoo.com/shortcuts/#news