[vtkusers] vtkContourGrid problem

[Sandarak]

Hello!

I'm trying to "convert" from vtkUnstucturedGrid to vtkPolyData using
vtkContourGrid filter. But no success in this.

All the points in the grid have the same scalar value (1.0). But as an output
from the filter I always get zero points, and nothing in render
window.

I'm also quite confused with the SetValue() function, I don't really
know what I should pass to it. I've tried to set it to 0.0 or 1.0,
without any effect. I'm rather unfamilliar with marching cubes
algorithm.

Thanks for any help,

Michal