[vtkusers] make a surface plot transparent

[yadin Bocuma Rivas]

Hi!
I have these program almost working
it plot a surface from given poins using 
now all that i would like to do is to make the surface looking like transparent (opaque)
how can i do this? any ideas? it all looks red (i do not want any color just transparent )
i atached the python file
please help me




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