[vtkusers] How can I get isolines from a FloatArray Data, I used vtkContourFilter???

[Mehdi HAJJI]

Hi,
I have a set of 3D points, I kept them in a FloatArray of real data.
Then I used a polyData structure by doing SetPoints and GetPointData()SetScalars().
How to draw the isolines from thees points. I used vtkContourFilter but he record this error : 
"ERROR: In C:\tp\Lib\VTK40\Graphics\vtkContourFilter.cxx, line 166
vtkContourFilter (0272B520): No data to contour"

		
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