Christopher James Huff wrote:
> In article <3ea807ba@news.povray.org>,
>  Simon Adameit <sim### [at] gaussschule-bsde> wrote:
> 
> 
>>It's not about being able to see both surfaces but about the rays not 
>>ending up parallel. 
> 
> 
> Parallel? Rays that start out parallel will stay parallel.

When you use ior the ray that enters the glass should be parallel to the 
one leaving the glass (in case of a flat window) which is not the case 
with a single surface. I think I'm so used to using ior and fresnel 
reflection with glass that I didn't even think of not doing so and 
simply using a single-surface as the refraction probably wont be visible 
anyways.

>>lightning?
> 
> No, lighting
> 

I know that you ment lighting and also wanted to say that but I dont 
know what you ment? (Does that make sense?)

> I now see how you were applying the object pattern, but not the slope 
> pattern. What are you using it for?
> 

For the same purpose. Make one side of the glass (the outside texture on 
one side) non transparent, highly reflective, or whatever...

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