[away3d] Some collada problems

[Kozulowski]

Hi everybody,
I'm developing my first site with away3d and I ran into some problems
with collada models. My graphic desinger made a model of a window with
courtains. The problem is that the courtains seem to be one-sided, the
models were created using Cinema4D with something that is called a
'two sided material'. My question is: Can I solve the problem of parts
of the model being one-sided using code? Set an attribute of some
sort? Or do the models require fixing?