[vtkusers] BuildLocator

[Alejandro Galindo Mateo]

Hello VTK users,

I´m a beginner and I don´t know what does the following sentence mean:

"These methods are thread safe if BuildLocator() is directly or indirectly 
called from a single thread fisrt"

This sentence is related to the class vtkPointLocator and the function 
FindPointsWithinRadius

What I have to do with BuildLocator? Have I to call it in other part of my 
code?

Thanks,