[vtkusers] pointpicker

[Gopalakrishnan, Gowri]

Hi I use the following code to set the pipe line

	vtkPoints *points = vtkPoints::New(VTK_DOUBLE); 
	vtkCellArray *lines = vtkCellArray::New();

	vtkpolydata takes the above two as the input. 
I do the plot with 42 points and it is alright.
But when I use point picker no matter where I pick on the screen the point
picker always returns 239306080. 
Do I have to set the point Id somewhere. The result is the same if I use
cellpicker instead of point picker. 

Can someone help please...
Regards
Gowri