Christopher James Huff wrote:
> In article <3ea7e2b2@news.povray.org>,
> 
> 
> Uh...why? You would still need a close look at it.
> 

It's not about being able to see both surfaces but about the rays not 
ending up parallel. You could use a lower ior to compensate for this but 
this will make fresnel reflection look all wrong.

> Well, as I've been saying, you can probably get a reasonable one-way 
> effect by good lighting. 

lightning?

>But I don't see how the slope pattern can help 

The same way object or gradient(if the window is flat) pattern can help.

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