[vtkusers] Polygon Data Access

[Nuwan Jayala]

Hello All,

I am trying to work vtkPolyData and would like to know the most convienient
ways to
access the following situation.

1. Access the vertex normals and the particular vertex. (and how the vertex
normals are calculated
inside vtk, avg of surface normals of the cells connected to that normal?)

2. There is a function in vtk GetCellNeighbors to get the cells connected
to a vertex. However,
the function requires a cellid. Is there a way that I can do this without
giving the cellid in a
clean mesh where each vertex is unique.

3. What is the best source to read to understand the internal data
structure of polygonal data?

Thank you.

Jaya
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