[vtkusers] how to use SetCroppingRegionFlags to get inverted clipping?

[khinwee]

Hi All!

I want to implement vtkBoxWidget to clip the inverted region of 3D volume
rendering. Can anyone guide me how to achieve that? 

My result image is as follow:

http://vtk.1045678.n5.nabble.com/file/n4612226/vtkBoxWidget.png 


But this result is the reverse of my goal. I wish to clip the inverted
region outside the vtkBoxWidget, which is shown as below:

http://vtk.1045678.n5.nabble.com/file/n4612226/open_window.png 

I read some articles say that i need to use:
volumeMapper->SetCroppingRegionPlanes(5,65,5,65,5,65); 
SetCroppingRegionFlags(0x7ffdfff);	

Can anyone show me a simple example? I can provide full codes at here.
Many thanks.


best regards,
vislai


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