[vtkusers] How to render semi-transparent effect using VTK

[Jianlong Zhou]

hi,all,
Does anyone know how to render semi-transparent effect using 
VTKß For example I want to render the medical data and want to 
render the skin semi-transparent, thus I can also see the interior of 
the data at the same time.
Does anyone give me some information about realizing this effect 
using VTK?

Thank you in adcance.

JL