[vtkusers] ImageActor re-rendering

[reyes mauricio]

Hi vtkUsers,

I'm using an ImageActor to visualize a set of images,

This is my pipeline
vtkImageReader2--->vtkImageMapToColors---->vtkImageActor--->vtkRenderer

  I use SetZSlice() to change the slice. But if I want to re-render after 
calling the SetZSlice method I get nothing on screen. I tried by calling the 
Modified() method for the actor without success.

Actually what I want to do is to change slice and write a bitmap of it.
It worked if I re-run all the pipeline for every slice, but I think it 
should be a better way.

Regards,
Mauricio

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