[vtkusers] conversion of unstrucuredgrid to polydata (for using the QuantizePolyDataPoints filter)

[luca penasa]

David Doria-2-3 wrote:
> 
> You can use the IdFilter to generate an array with the original ids
> which will go along for the ride on the points which are passed
> through:
> http://www.itk.org/Wiki/VTK/Examples/Cxx/PolyData/PointCellIds
> 
> You might also look at the tolerance functions of the superclass of
> the quantization filter:
> http://www.vtk.org/doc/nightly/html/classvtkCleanPolyData.html
> 

I've tried using the IdFilter but the problem is that after the point
merging performed by the quantization filter i cannot gain any information
on points which are not preserved into the output polydata. Using the ids i
can only get a point-to-point "connection" for the points which are present
into the final point cloud but i cannot get any kind of information for the
points merged/deleted.

If i am right, the tolerance parameters of the filter does not permit to
disable the points merging functionality (e.g. setting the tolerance = -1 or
something like that)



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