[vtkusers] passing vtk tcl instances to C?

[Sven Prevrhal]

Hi everybody,

I'd like to use vtk mainly in Tcl/Tk, but some time-critical stuff needs to
be implemented in C. How can I pass a vtk command instance from Tcl to C?

E.g., I have
tcl> vtkScalars s

Now I want to access this s in C.

Any help highly appreciated!

Thanks
Sven