[vtkusers] Tetrahedral elements

[Goodwin Lawlor]

I'm not sure what your input data is- but if its image data/structured
points/stack of images then you may like to look into vtkClipVolume which
will output tetrahedra in an unstructured grid. Because of how vtkDataMapper
works you might think that vtkClipVolume has outputed a surface. If you use
vtkExtractEdges and vtkPolyDataMapper you'll see that in fact the output is
tetrahedra. AFAIK vtkUnstructuredGridWriter is the only class to save
tetrahedta to disk.

HTH

Goodwin

----- Original Message -----
From: "Leila Baghdadi" <baghdadi at sickkids.ca>
To: "Hong Wan" <nghongwan at myrealbox.com>
Cc: "'Xiangyi Liu'" <xliu6 at nd.edu>; "'vtkuser maillist'"
<vtkusers at public.kitware.com>
Sent: Tuesday, November 19, 2002 5:13 PM
Subject: RE: [vtkusers] Tetrahedral elements


> Hi Hong
>
> To my knowledge ICEM needs a closed surface in order to generate internal
> tetrahedrals but you better check this through their website.
>
> Hope this helps
>
>
> Leila
>
> On Tue, 19 Nov 2002, Hong Wan wrote:
>
> > Hi Leila,
> >
> > Thanks for answering, I am also interested in this method.
> >
> > Using ICEM is it possible to close a gap or hole from the surface
> > generated from vtk?? I believed the import format to ICEM will be stl.
> >
> >
> > Regards
> > Hong Wan
> >
> > -----Original Message-----
> > From: vtkusers-admin at public.kitware.com
> > [mailto:vtkusers-admin at public.kitware.com] On Behalf Of Leila Baghdadi
> > Sent: Tuesday, November 19, 2002 1:46 AM
> > To: Xiangyi Liu
> > Cc: vtkuser maillist
> > Subject: Re: [vtkusers] Tetrahedral elements
> >
> > Hi  Xiangyi
> >
> > I have done alot of FE mesh generation with VTK in the past and I can
> > recall any method directly in VTK which will allow you to create
> > tetrahedral elements out of a surface. The method we used was to create
> > a surface using VTK and use a commercial package (ICEM) to generate
> > internal tetrahedral elements.
> >
> > Hope this helps
> >
> > Leila
> >
> >
> >
> >  On Mon, 18 Nov 2002, Xiangyi Liu wrote:
> >
> > > Dear vtkusers:
> > >
> > > I am a new user of vtk and still learning from the user's guide. Now I
> > have a
> > > problem which I found no answer in the guide. I will aprreciate your
> > advice.
> > >
> > > We have huge data files of microstructure image. We hope to mesh the
> > volume of
> > > the stucture into tetrahedral elements with smooth triangulated
> > surface. The
> > > surface part seems to be workabe, as to chopping the volume into
> > tetrahedral I
> > > found no solution. I wonder if you have come across such problem
> > during your
> > > use of vtk, and what you have done to overcome or bypass this problem.
> > >
> > > Thank you for your help!
> > >
> > > Xiangyi
> > >
> > > -----------------------------------------------
> > > Xiangyi Liu
> > > Graduate Student
> > > Aerospace and Mechanical Engineering Department
> > > University of Notre Dame
> > > -----------------------------------------------
> > >
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