[vtkusers] Offscreen rendering pipeline

[Martin Thornalley]

I was wondering if it possible to create a rendering pipeline that is not 
attached to a renderwindow.  I have a series of polydata datasets that I 
wish to register using the vtkIterativeClosestPointTransform class and 
following the registration obtain the number of iterations and mean 
distance.  I'd rather not do all this is a renderwindow if I can help it as 
I don't need to display the data at this stage.  I have succeeded in doing 
this within a vtkRenderWindow and set the opacity of all actors to 0 so that 
nothing is visible but I'd rather not have to create the vtkRenderWindow at 
all.

Any suggestions?


Thanks,
Martin Thornalley.

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