[vtkusers] accessing a existing VTK-render-window from another procedure

[Steffen Oeltze]

Dear VTK-users,

I have written 2 C++ procedures. One that creates 2 VTK-render-windows
showing raycasted volumes. This one works fine. The other procedure 
shall be
used to add geometry to each of the existing windows. The problem is that I
don't know how to accress the windows. (I'm not using Tcl but only C++.)
Do they have an ID or something similar ? Does anybody have a sample of
code ?

Thanks in advance,
Steffen Oeltze