Multiple volumes rendering with vtkGPUVolumeRayCastMapper

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Multiple volumes rendering with vtkGPUVolumeRayCastMapper

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Dear all,
        I am working on rendering several volumes, including overlapping in the same view with VTK.
        To implement this renderer, I used the following solution:      
        I managed to migrate this on VTK 7.1, but It is pretty slow, then I decided to update the solution to OpenGL2, which might increase dramatically the performance of the renderer.
        However, I found that you are working on multiple volumes renderer with vtkGPUVolumeRayCastMapper using OpenGL2.

        May I ask you if I can have more information about it:

             Did you manage to do something relevant?
             Did you encounter any difficulty?
             Could you give a rough estimation of the release?