[vtkusers] Volume + surface transparency with OpenGL2

[Xabi Riobe]

Hi Aashish,

For example, if you render a volume with vtkGPUVolumeRayCastMapper,
or vtkFixedPointVolumeRayCastMapper, and you put inside a sphere rendered
with vtkPolyDataMapper, as soon as you change the sphere actor opacity the
depth notion is lost, with the sphere appearing behind the volume.
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