[Insight-developers] itkVTKPolyDataReader.h reads ascii only--- why?

[wanlin]

Hi, brian,

         May be you could use the itk::TransformMeshFilter to the ITK-Mesh
to obtain the expected one?

wanlin


On Wed, Oct 20, 2010 at 2:40 PM, brian avants <stnava at gmail.com> wrote:

> Vince --- My understanding (though perhaps outdated?) is that vtk
> meshes lose direction information (obtained by calling GetDirection on
> an itk image) b/c a vtk image does not store this information.  So, if
> you create a pipeline like this:
>
> ITK-Image =>  VTK-Image => MarchingCube => VTK-Mesh => ITK-Mesh
>
> then you will lose the directionality information at the ITK to VTK
> stage.  Which is a problem if the direction is not the identity. The
> mesh, consequently, doesnt have orientation either, unless you
> explicitly set it yourself (not hard to do) by mapping the vtk-points
> through the orienting transformation.  So, maybe there is a filter
> that already does this or perhaps the vtk image object is updated and
> now stores the orientation?   Or maybe there's another vtk filter that
> should be inserted into the pipeline above to reorient the output of
> marching cubes back into ITK physical space?
>
> B
>
>
> On Tue, Oct 19, 2010 at 10:55 PM, Magnotta, Vincent A
> <vincent-magnotta at uiowa.edu> wrote:
> > Brian,
> >
> > I don't understand this question. Isn't the VTK point information already
> in
> > physical space? Maybe this is just how I have always dealt with the VTK
> > data. I believe that Slicer also follows this convention.
> >
> > Vince
> >
> >
> > ----------------------
> > Associate Professor
> > Department of Radiology
> > 0453-D JCP
> > 200 Hawkins Drive
> > Iowa City, IA 52242
> > E-mail: vincent-magnotta at uiowa.edu
> > Phone: 319-356-8255 Fax: 319-353-6275
> > Website: http://www.radiology.uiowa.edu
> >
> >
> >
> > -----Original Message-----
> > From: insight-developers-bounces at itk.org on behalf of brian avants
> > Sent: Tue 10/19/2010 2:57 PM
> > To: Alexandre GOUAILLARD
> > Cc: Insight-developers at itk.org; Luis Ibanez
> > Subject: Re: [Insight-developers] itkVTKPolyDataReader.h reads ascii
> only---
> > why?
> >
> > Hi Alexandre, Wanlin , dev-list
> >
> > Would it be possible to add a reference image space to the vtk reader?
> >  That is, because vtk files dont have physical space associated with
> > them, we could have an optional input to the filter that would
> > reorient the mesh using the space of the image from which the mesh was
> > originally derived.  I guess this should probably be a separate
> > unoriented to oriented mesh filter ... have you already resolved this
> > issue?
> >
> > Brian
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