[vtkusers] Polydata cell connectivity list

David.Pont at ForestResearch.co.nz David.Pont at ForestResearch.co.nz
Tue Feb 8 15:59:03 EST 2005

Hi Wesley,
   As suggested by Amy vtkCleanPolyData will tidy up coincident points.
If you are constructing the vtk data set you could also use
vtkMergePoints->InsertUniquePoint to have vtk handle re-using existing
points for you.  It gives you back a point id (possibly new or existing).
Call this for each point in a new cell to build a list of point id's and
then use these to add a new cell to your polydata. This is a 'fast' type of
vtkPointLocator, but I dont know if it is any faster than just cleaning up
Its a very hot summer day in this part of the world, a pint sounds like a
great idea... but it is now 10am, so a cuppa will have to do
   Dave P

Wesley Brooks <wesbrooks at gmail.com> wrote on 09/02/2005 05:45:16:

> Think I've got something. I know the list of co-ordinates that I have
> created all connect but I think the way I have created the polydata
> may leave them unconnected. If I add two lines that share a point -
> ie. add four co-ordinates in the above method - will vtk recognise
> that the points are identical? Any way to clean up identical points in
> vtk of have I just got to be more carefull and add the points and
> lines in a different method?
> Cheers again for your help.
> Wesley.

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