[vtkusers] isosurface extraction question

[kdsfinger at gmail.com]

hi, all
Assuming I have two neighboring regions, marked as 1 and 2 and the
background is 0. I want to find the contour surface of each region.
How can I get the contour surface of the region marked as 1? When I
use the surface extraction or marching cube methods, I always get the
contour of (1 And 2) when I tried to find the contour of region marked
as 1. There is no problem to get the contour of region marked as 2.
Thanks for comments.
zl2k