[vtkusers] Is there any way to preserve some of the original points thru decimation?

[Amy Henderson]

vtkQuadricClustering has a UseInputPoints option. It doesn't allow you to 
specify which points to use. Using this option means that when a 
representative point is selected to replace a group of points, the 
representative point will be one of the points from the input mesh.

To my knowledge, the other decimation algorithms do not have similar 
functionality.

- Amy

At 01:17 PM 9/20/2004, Mathieu Malaterre wrote:
>Chris,
>
>         No I don't think there is such options in vtkDecimate* class. 
> What do you call a subset ? Any kind or a particular one? Such as 
> boundary vertex ? If so then yes you can 'freeze' the boundary vertex 
> (BoundaryVertexDeletionOff).
>
>         Otherwise you'll have to look at the code to implement such 
> enhancement. How do you plan to pass such arbitrary points ? User interaction ?
>
>Thanks
>Mathieu
>
>Chris Zakrewsky wrote:
>>Hi all,
>>I send a message a few days ago on this subject but I've got no
>>response yet and I am very keen to find out the answer. A simple
>>pointer would do.
>>     Is there any way to preserve some arbitrary subset of vertices
>>     (from a mesh) unchanged thru the decimation process? (i.e. freeze
>>     some vertices, while the rest can be decimated by vtkDecimate or
>>     alike)
>>Is this capability available in VTK at all?
>>
>>Very best regards,
>>/Chris Zakrewsky
>>http://www.ustation.se
>>Sweden
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>
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