[vtkusers] Using vtkContourFilter for Rendering a Point Cloud

[Moaix]

Dear all,

i have an Unstructured Grid of Points representing a Point Cloud. Each point
has a scalar value that is its energy. 
I want to create isosurfaces in energy for the volume where this point cloud
is located. As i started using vtk just two weeks ago, i want to know how to
do that. I think, vtkContourFilter will do that but i don't know how to use
it.

Can anybody help me with my problem?  

Thank you in advance,

Moritz 
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