[vtkusers] Slicing a volume that contains different colored actors

[BS]

Dear all,
I have a vtkRenderer object that contains many different colored actors.
I want to slice the volume to get a colored slice in which the color will be
the same as the one at the intersection area (between the slicing plane and
the volume).
I can slice the volume using vtkImageReslice by appending the poly data of
the actors using vtkAppendPolyData but I cann't get the color.
Please advise me how to do that.
Thanks.
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