[vtkusers] Holes in an object created with vtkImplicitBoolean

[TKB 3. Prakt. Corina Farcas]

Hello everybody!

I am drawing a prism by unifying five planes. I use the classes 
vtkImplicitBoolean and vtkImplicitFunction to creade the prism. I have a 
lot of those prisms, which I am trying to unify to an object. The 
problem is, that I get holes in my object. Why do I get this holes?

Thanks in advance,

Corina