[vtkusers] How to Convert 3D heights to 2D Heights for Greedy Terrain Decimation

[vikrant aglawe]

Hi All,

          I am converting vtkPolyData to vtkImageData using a probe filter
but I am getting an error saying cannot convert 3D heights to 2D Heights
when this vtkImageData is passed to the vtkGreedyTerrainDecimation object.
Could ny1 tell me why this happens, or where am I going wrong. & how can I
achieve the goal?

Thanks in advance.

 Vikrant.
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