[vtkusers] how to pick point in multi vtkRenderer vtkRenderWindow?

[Tsai_tow]

Hi,vtkusers!
	In tcl/tk,I create a vtkRenderWindow with two vtkRenderers and one vtkPolyData in each vtkRenderer.
The problem is how i can pick a point of the two vtkPolyData with x-y pixel coordinate in the vtkTkRenderWidget.
	


 				
　　　　　　　　　　　　　　Tsai_tow
　　　　　　　　　　　　　　victor100 at 263.net
　　　　　　　　　　　　　　　　　2001-12-1113:16:43