[vtkusers] alpha value

[Torsten Wirz]

hi everybody,

I´m making my first steps in programming vtk and have a question regarding the 
alpha transparency. 
I have a couple of iso-surfaces (vtkContourFilter) and defined the alpha range 
in the lookuptable as followed:

lut->SetAlphaRange(0.1,0.9);

looks pretty fine, but if I look from the other side, using the interactor or 
moving the camera, the transparency disapears and the outer surfaces have the 
wrong color. 
has it anything to do with lights, or do I missunderstand the alpha 
transparency?

thanks in advance
torsten

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Dipl.-Ing. Torsten Wirz
Institute for High Voltage Technology
University of Technology RWTH-Aachen
Schinkelstrasse 2, SG 104
D-52056 Aachen
wirz at ifht.rwth-aachen.de
http://www.ifht.rwth-aachen.de

Phone:  ++49 241 80 94910
Fax:    ++49 241 80 92135
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