[vtkusers] identifying Cells with same normals

[R K Shyamprakash]

Hello,
             I have a vtkPolyData object which is a collection of
vtkTriangle. If I pick any one of the cells i want to determine all the
cells which lie on the same plane as the picked cell(effectively the cells
which share same normals with some tolerance). Is there a built in class in
VTK to do this or I will have to implement the algorithm on my own? Can
somebody give a hint.

Thanks
Shyam