[vtkusers] determine duplicate cells (lines) and clean them like vtkCleanPolydata

[Chiranjib Sur]

Hi,
I am constructing polydata for unstructured grid from randomly scattered
points.

Once I know the point IDs I am creating the connectivity between two points
using a line (vtkline) and creating the cells around

Something like this example :
http://www.vtk.org/Wiki/VTK/Tutorials/TriangleGeometryLines

The connectivity works this way

//create a line between each pair of points
  vtkSmartPointer<vtkLine> line0 = vtkSmartPointer<vtkLine>::New();
  line0->GetPointIds()->SetId ( 0,0 );
  line0->GetPointIds()->SetId ( 1,1 );


The way I am doing it is to find nearest neighbours for each point and
setting a line between those two points. In this, I am overdoing the
creation of lines because when I search nearest neighbour for point I (say
Id = 8) and find J (say Id = 10), I create a line between 8 and 10.

The next time, I found the point I (Id = 10) for which one of the nearest
neighbour is Id=8. At this stage I don't want to create a connectivity
between 10 and 8 again, since I have already created it for 8-10.

Any idea how to I do that.

vtkCleanPolydata filter takes care of the duplicate points but not for
duplicate lines (cells). Is there any classes/ filter available which I can
use?

Thanks much in advance.

Chiranjib
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