[vtkusers] Getting the original cell id'sfrom vtkExtractUnstructuredGrid

[Sarah Macumber]

Hey Bryn, 
 
I tried to use that filter but it was unclear how to extract the actual ID's as the GetPointIds( ) function enables or disables the setting of point ID's but does not return an actual vtkIDList.  
 
I was able to accomplish what I wanted by setting the Pedgree ID's of my unstructured grid, those ID's hang around even after you've run algorithms and filters. 
 
Cheers,
Sarah

________________________________

From: vtkusers-bounces at vtk.org on behalf of Bryn Lloyd
Sent: Wed 7/23/2008 2:14 AM
To: vtkusers at vtk.org
Subject: Re: [vtkusers] Getting the original cell id'sfrom vtkExtractUnstructuredGrid



Hi Sarah,


A simple method is to use the vtkIdFilter before you extract a
region/surface/whatever.

http://www.vtk.org/doc/nightly/html/classvtkIdFilter.html


Cheers, Bryn

Sarah Macumber wrote:
> Hi all,
> 
> Is there anyway to get the original cell & point ID's from vtkExtractUnstructuredGrid which returns a new vtkUnstructuredGrid?  For example if you extract the cells using extents in the middle of your dataset how can you find out what those cell & point ID's are?  They get re-ordered in the new grid.  I am not doing extraction via graphical selection so I need to use global cordinates to do my extraction & then get back an ID list of the cells.
> 
> Any help is appreciated, Sarah
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--
-------------------------------------------------
Bryn Lloyd
Computer Vision Laboratory
ETH Zürich, Sternwartstrasse 7
CH - 8092 Zürich, Switzerland
Tel: +41 44 63 27690
Fax: +41 44 63 21199
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