[vtkusers] Difference between 2 vtkPolyDataSet

[Sébastien Decolnet]

Hi,

I was a user of vtk 5.0 and I need to obtain the difference between 2 
vtkPolyData in an other vtkPolyData.

My first idea is to create 2 vtkImplicitDataSet with my 2 vtkPolyData and 
using these vtkImplicitDataSet in a vtkImplicitBoolean to obtain the 
difference. But the output of vtkImplicitBoolean is an ImplicitFunction and 
not a vtkPolyData....

In the VTK User's Guide of the version 4.4, they used vtkSampleFunction to 
create geometry of the ImplicitFunction. We obtain a vtkImageData in the 
output of this filter. How can I transform a vtkImageData in a vtkPolyData? 
If somebody has another idea to obtain in a vtkPolyData the difference 
between to other Polydata, can he help me to solve this problem??

Thanks