In article <3ea7e2b2@news.povray.org>,
 Simon Adameit <sim### [at] gaussschule-bsde> wrote:

> A one-way glass window does only make sense if you will be able to see 
> it from both sides

Right. Otherwise you could just change the texture.


> and if you see it from both sides

Say, from a mirror in the room on the "subject" room, with the camera in 
the "observer" room.


> you will be able to tell the difference between a thick glass and a 
> single-surface glass 

Uh...why? You would still need a close look at it.


> thus you need a way to archieve one-way thick glass which with interior 
> texture alone wont work, the interior texture needs to be transparent 
> but the outside texture only needs to be transparent on one side which 
> you can archieve with the object or slope pattern.

Well, as I've been saying, you can probably get a reasonable one-way 
effect by good lighting. But I don't see how the slope pattern can help 
here. Are you using the object pattern to only silver one side of the 
glass? That's a little overkill in flexibility, and gradient would 
probably be as fast, but it would work.

-- 
Christopher James Huff <cja### [at] earthlinknet>
http://home.earthlink.net/~cjameshuff/
POV-Ray TAG: chr### [at] tagpovrayorg
http://tag.povray.org/

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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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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.


> You could use a lower ior to compensate for this but 

Ah, you are thinking of using ior. With a single-surface window, you 
would obviously not use an ior.


> this will make fresnel reflection look all wrong.

Why are you using fresnel reflection?


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

No, lighting.


> >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.

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

-- 
Christopher James Huff <cja### [at] earthlinknet>
http://home.earthlink.net/~cjameshuff/
POV-Ray TAG: chr### [at] tagpovrayorg
http://tag.povray.org/

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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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