[vtkusers] filter volume by isosurface

[Berk Geveci]

You have a few ways of (kind of) doing this:

1. Clip the volume with vtkClipDataSet or vtkClipVolume with a
scalar value to generate unstructured data. The output dataset
will include hexs (cells that are not touched by the isosurface) 
and tets (cells that are clipped by the isosurface). 
2. Use vtkThreshold to generate unstructured data. The output
dataset will include only hexs.

The problem with both of the above solutions is that you end
up with unstructured data and you can no longer use structured
data filters.

-Berk

On Mon, 2003-10-20 at 15:13, Katherine White wrote:
> Hello,
> 
> I have searched the archives and the doxygen pages, but I can't seem to
> find an answer to my question.  What I want to do is take a cube of data,
> say 256x256x256, generate an isosurface within that volume data, and then
> do mathematical operations on the data that lies on or inside that
> isosurface.  I have been able to generate isosurfaces using
> vtkContourFilter and vtkMarchingCubes, but the isosurface is polydata.  I
> want structured grid data inside the polydata.  Does a filter exist to do
> this?
> 
> Thanks,
> Kate Kerekes 
> ------------------------------------
>   Katherine Kerekes
>   251 South Saint Clair Street
>   Apt. 4
>   Pittsburgh, PA 15206
> 
>   kerekes at fastmail.fm
> ------------------------------------
-- 
Berk Geveci <berklist at nycap.rr.com>