[vtkusers] help needed setting up the colormap/lookuptable/mapper in C++

[David, John]

> You could use vtkDoubleArray or vtkFloatArray to set up the scalars:
> 
> vtkDoubleArray *scalars = vtkDoubleArray::New();
> for (i=0; !in.eof() && in.good(); i++)
> {
>     in >>  v;
>     scalars.InsertNextValue(v);
> }
> polyData->SetScalars(scalars);


Hmmm...  That gives me a compile error:

  'class vtkPolyData' has no member named 'SetScalars'

I thought that maybe I had to go through a PolyDataMapper, but that did not work as well.  
Poking around a little I found that the SetScalars method is defined in vtkDataSetAttributes.h, vtkMergeFilter.h, and ./vtkSampleFunction.h.  Do I have to set up a merge filter to set the scalers?  Any other suggestions?


BTW, I defined the polyData and mapper as follows:

vtkPolyData *polyData = vtkPolyData::New();
vtkPolyDataMapper *aMapper = vtkPolyDataMapper::New();