[vtkusers] picking + volume rendering

[Sebastian Loebbert]

Hi everybody,

I have written a simple volume rendering app which renders MRI images 
(using vtkStructuredPoints as data format).
Now I would like to click on a pixel in the rendered image and "pick" 
which voxel is the last one that contributed to this pixel (I would like 
to get the 3 coordinates and the voxel value).
I have been using IDL for similar applications, there I simply say 
"volume->pickvoxel(screen_x, screen_y)". 
Is there a similar feature in vtk?

Best regards and thanks a lot,

Sebastian