[vtkusers] get selected area's point coordinates

[oka]

Dear Users,

How can I get point coordinates of rubbberband or click
selected area ? I know node or element label numbers can 
be obtained, but how about point coordinates ?
My trial is to get the closest original points to clipping surface
points when clipping was done. Clipping generates new points
which has different coordinates and labels from original ones.
Therefore, I want to estimate the closest original points from
clipped selected surface's point coordinates. 

Best regards,

Oka
-- 
oka <oka at bpe.es.osaka-u.ac.jp>