[vtkusers] How to paint(colorwash) the surface of an object(vtkPolyData) using values from a vtkImageData

[hdp203]

Hi, 
I have a vtkPolyData object and a vtkImageData object. 
The vtkPolyData object contains a set of triangles (polys) to makeup a
surface of an object in 3D. 
The vtkImageData object (in the same coordinate system as vtkPolyData
object) contains a 3D array of floats. 
I want to paint(color wash) the surface of vtkPolyData object using the
floating point values from the 3D array. 
Is it doable in vtk?   
Can someone please tell me which filter(s) to use to accomplish this? 

Thank you, 
hdp.
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