[vtk-developers] vtk 3D cursor

[mhiriM]

Hi all, am an it student and i wanna implement a 3d cursor like in this
video. 
http://www.youtube.com/watch?v=0b3gKZlobLA

I'm using vtk 5.8 and coca with c++ . 
I have found a TCL source code on " Link " 

i have translated it into c++ 
but i have errors on these lines : 

 cursor->SetModelBounds(reader->GetOutput()->GetBounds()); 
 cursor->SetFocalPoint(reader->GetOutput()->GetCenter()); 


" Member access into incomplete type vtk structured grid " 


what this error stand for? and does anyone have a source code for
implementing a 3d cursor? 

Thanks a lot. 
I'm a vtk newbie and i'm stuck in this point for now 1 week.

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