[vtkusers] How to clean the render window?

[Yan Pingkun]

Hi, all,
 
I visualized an object on the screen and then I want to erase it. Any
idea?
I tried to use vtkActorCollection. But there's run time error and I
don't why.
 
Could any one give me an example?
 
Thanks!
 
Regards,
Pingkun
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