[vtkusers] PLEASE HELP - weird behaviour when performing picking using vtkCellPicker

[Vladimir Lazunin]

Don't know about the first problem of yours, but as for the second, try to  
use SetTolerance() function for the picker object. If you set it's value  
very small, it will increase precision of picking. Also, if there are  
several objects and you are trying to pick only one, try to use vtkActor's  
PickableOn()/PickableOff() methods.