Take a look at MegaPov - http://megapov.inetart.net/

You could use its AOI (angle-of-incidence) pattern and a texture map to 
create the effect you described.

Regards,
-Sascha Ledinsky

Henrik Fisch wrote:
> I need this feature for simulating stretched materials like an inflated toy
> balloon. Normally you can look through the balloon. As your sight goes near
> the walls of the balloon, you will notice that the balloon is no longer
> transparent but will become more and more opaque. This feature is present
> for example in Poser (e.g. V 4.03), whre you can set a min and a max value
> for the transparency. But I can not find it in POVRay.
> 
> Please help. Do I miss anything in the documentation or is it not possible
> to do something like that?
> 
> Regards,
> Henrik Fisch
> 
>

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