[vtkusers] Holes in surface vs volume

[Asad A. Abu-Tarif]

Hi Gary,
I'm assuming that you are using something like
the Marching Cubes or vtkContourFilter to find
the isosurface(s).

I faced the same thing when I started using
vtk few years back. If I remember correctly,
the reason was that the voxels with the intensity
value where I wanted my isosurface were
not 8-connected. You don't want them to have
only edge connectivity, you need face
connectivity!! A simple quick test would be
to dilate first and see if this fixes the problem.
If it does, then make sure to regenerate the
vtkStructuredPoints.

Regards,
Asad
***************************************************************************
*  Asad A. Abu-Tarif
*  Computer Engineering.
*  PhD Candidate, Rensselaer Polytechnic Institute (RPI).
*  http://asad.ods.org/Professional/
*  tarifa at rpi.edu
*  Registration Toolkit: http://asad.ods.org/RegMagicTKDoc/
***************************************************************************
----- Original Message -----
From: "Gary L. Graf" <glgraf at asu.edu>
To: "vtk vtk" <vtkusers at public.kitware.com>
Sent: Thursday, May 09, 2002 7:15 PM
Subject: [vtkusers] Holes in surface vs volume


> Hi,
>    I have a data set in in regular grid represented by a
> vtkStructuredPoints.  I can easily find the iso-surface but when
> rendered it will leave holes at the boundary of the grid even though all
> the data inside and on the iso-surface is the same, constant, value.
> What I would like to do is see the shape as a solid rather than as
> independent walls with holes and gaps.  How do I go about doing that?
> Thanks - Gary Graf
>
>
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