[vtkusers] Displaying coloured polydata in a different colour

[andyjk]

Is it possible to display a set of coloured points in a different colour?

For example :
I have vtkPolyData with colour defined (this displays correctly in colour)

If I add  : source_actor->GetProperty()->SetColor(0.0,0.8,0.0); 
this statement seems to get ignored as the data is still displayed in its
original colour.

If I delete the colour fields out of the vtkPolyData then the object is
displayed in green (as expected).

So my question : Is there a way to 'override' an objects colour for display
purposes (and eg display the object entirely in green) without having to
permanently delete the objects pre-existing colour ?

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