[vtkusers] Interface between labels in vtk, is it possible ?

[Henry Proudhon]

Hi everyone,

I'm trying to build the interface between some labelled voxel.
As an example I've created a 10 x 10 x 10 volume containing 3 different
labels.

Using the Amira software (now Avizo) I can do that with the SurfaceGen
module. see:
http://img300.imageshack.us/my.php?image=surfgenavizo1st7.png

Now I'm trying to reproduce this using Vtk filters but no luck here.
I've used the vtkDiscreteMarchingCubes adding the 3 labels. but this
actually create 3 interfaces leaving a small hole at the triple point.
http://img90.imageshack.us/my.php?image=surfgenvtkaf1.png

Any advice or idea ?
Thanks in advance,
Henry