[vtkusers] Help again

[Mathieu Malaterre]

> I think that the reason is again a missing header so I 

Correct

went to the include 
> path and did a grep looking for `GetLines'  and `GetPoints', I've tried all 
> the headers that came out and none worked.

This is the right approach. Two things then:
1. You know the Macros in Common/vtkSetGet.h thus you search for vtkGetObjectMacro (Points)
2. You don't know this, then you go to the online documentation: 
http://vtk.org/doc/nightly/html/functions.html
And search for 'GetPoints'

> I'll apreciate any help you could bring me in this learning proccess.

HTH
Mathieu