[vtkusers] how to thread a rendering

[Jesús Spí­nola]

Hi,

I'm developing a MPR ( multi-planar reconstruction ) with MIP (Maximum
intensity projection).

First I have three rendering windows ( in 2D with vtkImageViewer2 ) to edit
the plane from which I do the reslicing for the MPR.
When the user has selected the reslice he wants he pushes a button to see
the MIP of that reslice, so I open a new rendering window next to the other
windows. When I request the MIP it takes some seconds and the whole
application "freezes" until it has rendered the image.

So I would like to avoid that "freezing" in order that the user could do
other things while he is waiting for the MIP result, like interact with the
other 2D images, for example.

What's the best way to make a thread for the MIP rendering? Does VTK provide
any mechanism to do that?

Thanks in advance
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