[vtkusers] Picking without an Interactor

[Chih-Wei Chiu]

Is it possible to perform pick without using an interactor?
Because I use Tk to build my own GUI, and if I use an interactor, the GUI
will freeze.

PS: I've ask this question before, but no reponse. So I ask it again.
--
Chih-Wei Chiu <http://www.csie.nctu.edu.tw/~jwchiu>
Computer Graphics and Geometry Modeling Laboratory,
Computer Science and Information Engineering Department,
National Chiao-Tung University, Taiwan