[vtkusers] volume and actors opacity

[Eduard Schreibmann]

I try to use in the same renderer, a volume and one actor.
The volume is rendered by adding 3 vtkVolumeTextureMappers to a vtkLOD, and 
than this Lod to the renderer.
The actor has an opacity of 0.1
If the volume is added to the renderer, even if it is not visible, the actor 
is opaque.
If the volume was not added to the renderer, the actor is transparent.
Is there a condition that actors should be opaque when rendered togheter 
with a volume ? Is there a way to turn off this behaviour ?
Thank you
Edi

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