[vtkusers] Difference between AddArray, SetScalars, SetVectors

[David Doria]

To attach colors to points in a polydata, which one of these should I use?

  vtkSmartPointer<vtkUnsignedCharArray> Colors =
vtkSmartPointer<vtkUnsignedCharArray>::New();
  Colors->SetNumberOfComponents ( 3 );
  Colors->SetName ( "RGB" );

1) polydata->GetPointData()->SetScalars ( Colors ); - this one seems
to be the most "paraview compatible", as the colors are automatically
applied without having to go to "Display -> Color by -> RGB" as you do
if you use the following two
2) polydata->GetCellData()->SetVectors ( Colors );
3) polydata->GetCellData()->AddArray(Colors);

This is not scalar data (they are triples):

unsigned char Red[3] = {255, 0, 0};
Colors->InsertNextTupleValue ( Red );

so I don't even understand why this one would work (and it is the "best")?

Can anyone explain what is actually going on with these functions?

Thanks,

David