[vtkusers] Add a new scalar and array to vtkPolyData

[Ahmad]

I came to the following solution to extend 2D coordinate data to 3D
coordinate. Do you think there is a better way than looping through all the
points to add the value of z by the following code?

for-loop-through-all-points (i):
    double temp[3];
    polydata->GetPoints()->GetPoint(i,temp) ;    
    temp[2]=z[i];
    polydata->GetPoints()->SetPoint(i,temp[0],temp[1],temp[2]) ;
end-for-loop

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