[vtkusers] z-buffer of objects with opacity < 1.0

[ursula.kose at philips.com]

Dear all,

I do have a very urgent question. Can somebody tell me what happens to the
z-buffer when an object is not fully opaque (opacity = 1.0) but has an
opacity
of less then 1.0?
How can I influence the z-buffer such that it is built as I need it?

Thanks,
Ursula