[vtkusers] Iso lines visualisation on points grid

[R M]

Hello,

Here's my problem, I have written a reader that read a point  grid file. It is 
composed of points with a constant Z and for each points I have an associated 
value.
My reader creates a vtkPolyData. Now I would like to create the iso lines of my 
grid. I have tried the contour filter (in paraview) but I have nothing at the 
ouput.
If I use the delaunay filter, the output geometry is not nice.

So, if someone know how I can create iso lines from points grid, that would be 
great.

Thank You.
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