[vtkusers] Updating actors

[acech]

Hi all,

Quick question! I am using variable points to draw a line. During the
execution of my application these points get moved. How do I force the actor
representing the line to be updated so that it reflects this. If I try
updating the points and then adding the actor  to the renderer again I end
up with both the old line and the new line. What is the process for simply
updating it?

Many thanks,

Chris
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