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1 Aug 2024 14:27:06 EDT (-0400)
  my pool table with shinier billiard balls (Message 13 to 22 of 22)  
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From: Christian Froeschlin
Subject: Re: my pool table with shinier billiard balls
Date: 14 Aug 2008 15:37:34
Message: <48a4897e$1@news.povray.org>
jhu wrote:
> where should the light(s) be placed? 

Have a look at

http://www.pool-and-billiards.com/pool_table_lights.htm


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From: jhu
Subject: Re: my pool table with shinier billiard balls
Date: 15 Aug 2008 21:45:00
Message: <web.48a630929c5df9dd8b562d820@news.povray.org>
Here's the latest one. Something doesn't seem quite right though.


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From: Mike Williams
Subject: Re: my pool table with shinier billiard balls
Date: 16 Aug 2008 02:10:00
Message: <cV7M3eAO4mpIFwx+@econym.demon.co.uk>
Wasn't it jhu who wrote:

>Here's the latest one. Something doesn't seem quite right though.

The combination of pin sharp reflections and high focal blur might not 
be realistic. If there's enough focal blur to fuzz out a ball that's a 
foot away from the centre of focus, then I'd expect it to affect the 
reflection of the window that's several yards away.

-- 
Mike Williams
Gentleman of Leisure


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From: jhu
Subject: Re: my pool table with shinier billiard balls
Date: 16 Aug 2008 02:50:01
Message: <web.48a678099c5df9dd8b562d820@news.povray.org>
I don't think in real life the reflection would be blurred out.

Mike Williams <nos### [at] econymdemoncouk> wrote:
> Wasn't it jhu who wrote:
>
> >Here's the latest one. Something doesn't seem quite right though.
>
> The combination of pin sharp reflections and high focal blur might not
> be realistic. If there's enough focal blur to fuzz out a ball that's a
> foot away from the centre of focus, then I'd expect it to affect the
> reflection of the window that's several yards away.
>
> --
> Mike Williams
> Gentleman of Leisure


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From: jhu
Subject: Re: my pool table with shinier billiard balls
Date: 16 Aug 2008 02:55:01
Message: <web.48a679169c5df9dd8b562d820@news.povray.org>
ok found an image. It's not all that pronounced

Mike Williams <nos### [at] econymdemoncouk> wrote:
> Wasn't it jhu who wrote:
>
> >Here's the latest one. Something doesn't seem quite right though.
>
> The combination of pin sharp reflections and high focal blur might not
> be realistic. If there's enough focal blur to fuzz out a ball that's a
> foot away from the centre of focus, then I'd expect it to affect the
> reflection of the window that's several yards away.
>
> --
> Mike Williams
> Gentleman of Leisure


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From: Eero Ahonen
Subject: Re: my pool table with shinier billiard balls
Date: 16 Aug 2008 11:31:54
Message: <48a6f2ea$1@news.povray.org>
Mike Williams wrote:
> 
> The combination of pin sharp reflections and high focal blur might not 
> be realistic. If there's enough focal blur to fuzz out a ball that's a 
> foot away from the centre of focus, then I'd expect it to affect the 
> reflection of the window that's several yards away.
> 

Nnnope. The point of focus is still on the surface of the ball, 
containing practically an image of the reflected area, so DoF won't 
affect on the reflection - for a camera the reflection is like a photo 
on a stand.

-- 
Eero "Aero" Ahonen
    http://www.zbxt.net
       aer### [at] removethiszbxtnetinvalid


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From: Mike Williams
Subject: Re: my pool table with shinier billiard balls
Date: 16 Aug 2008 14:08:33
Message: <4i11aNA0YxpIFwGl@econym.demon.co.uk>
Wasn't it Eero Ahonen who wrote:
>Mike Williams wrote:
>>  The combination of pin sharp reflections and high focal blur might 
>>not  be realistic. If there's enough focal blur to fuzz out a ball 
>>that's a  foot away from the centre of focus, then I'd expect it to 
>>affect the  reflection of the window that's several yards away.
>>
>
>Nnnope. The point of focus is still on the surface of the ball, 
>containing practically an image of the reflected area, so DoF won't 
>affect on the reflection - for a camera the reflection is like a photo 
>on a stand.

That's cool. So if I want to take a photo and eliminate focal blur 
completely, I can just take the photo of a mirror? The reflection will 
be on the surface of the mirror, so if I focus on the mirror itself 
things reflected from any distance will all be in perfect focus.

-- 
Mike Williams
Gentleman of Leisure


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From: triple r
Subject: Re: my pool table with shinier billiard balls
Date: 16 Aug 2008 18:20:00
Message: <web.48a751e39c5df9ddef2b9ba40@news.povray.org>
Eero Ahonen <aer### [at] removethiszbxtnetinvalid> wrote:

> Nnnope. The point of focus is still on the surface of the ball,
> containing practically an image of the reflected area, so DoF won't
> affect on the reflection - for a camera the reflection is like a photo
> on a stand.

Well, not quite.  Just because it's in a mirror doesn't mean the laws of physics
don't apply.  For a diverging mirror (like a sphere) a virtual image exists a
short distance behind the mirror.  For a ball with radius R, an object at
infinity produces a virtual image about R/2 behind the surface.  This probably
falls well within the depth of field, so the smaller the radius of the ball,
the more it tends to focus the reflection.  Of course it can never be perfectly
in focus though, and a planar mirror won't do anything.

 - Ricky


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From: Warp
Subject: Re: my pool table with shinier billiard balls
Date: 17 Aug 2008 06:52:56
Message: <48a80308@news.povray.org>
jhu wrote:
> Here's the latest one. Something doesn't seem quite right though.

  Much better. Now the balls are starting to have that sparkle and
shininess they should.


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From: Rafal
Subject: Re: my pool table with shinier billiard balls
Date: 17 Aug 2008 17:57:02
Message: <48a89ead@news.povray.org>
Thomas de Groot wrote:

>> One bill 15, the lower white part have some gray spots not visible
>> elsewhere, is it correct? Or strange normal, or glitches from radiosity?

> That is the reflection of the felt. Ball 10 shows the same.

It doesn't look natural for me - I dont think it is as visible in real
world.

Perhaps adding blurred reflection? Or make reflection strength depend on
angle

-- 
RafaƂ Maj
Software developer


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