POV-Ray : Newsgroups : povray.beta-test : e_and_SOR_–_Beta_38 Server Time
28 Jun 2024 02:51:27 EDT (-0400)
  e_and_SOR_–_Beta_38 (Message 1 to 7 of 7)  
From: Stephen
Subject: e_and_SOR_–_Beta_38
Date: 28 Aug 2010 14:17:17
Message: <4c7952ad@news.povray.org>


It is not a big scene but all of the elements are required for it to 
fail. It also seems to be dependent on the camera angle.

-- 

Best Regards,
	Stephen


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From: Stephen
Subject: h_Lathe_and_SOR_–_Beta_38
Date: 28 Aug 2010 14:23:36
Message: <4c795428@news.povray.org>
On 28/08/2010 7:17 PM, Stephen wrote:


> It is not a big scene but all of the elements are required for it to
> fail. It also seems to be dependent on the camera angle.
>


It is in my sent box (47K)

-- 

Best Regards,
	Stephen


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From: Stephen
Subject: h_Lathe_and_SOR_–_Beta_38
Date: 28 Aug 2010 14:27:47
Message: <4c795523@news.povray.org>
On 28/08/2010 7:23 PM, Stephen wrote:
> On 28/08/2010 7:17 PM, Stephen wrote:


>> It is not a big scene but all of the elements are required for it to
>> fail. It also seems to be dependent on the camera angle.
>>
>

> It is in my sent box (47K)
>



I'm beginning to hate Thunderbird.

-- 

Best Regards,
	Stephen


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From: clipka
Subject: h_Lathe_and_SOR_–_Beta_38
Date: 28 Aug 2010 15:05:51
Message: <4c795e0f@news.povray.org>
Am 28.08.2010 20:27, schrieb Stephen:


>> It is in my sent box (47K)
>

>
> I'm beginning to hate Thunderbird.

Looks fine here, with T'bird also. In this case it's apparently the web 
interface that stumbles over a long (non-ASCII) dash you put in the subject.


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From: clipka
Subject: h_Lathe_and_SOR_–_Beta_38
Date: 28 Aug 2010 15:31:27
Message: <4c79640f@news.povray.org>
Am 28.08.2010 20:17, schrieb Stephen:


> It is not a big scene but all of the elements are required for it to
> fail. It also seems to be dependent on the camera angle.

The root cause is a combination of

(1) a problem with either the sor or lathe object, returning "undefined" 
as the surface normal at a certain point (which leads to "undefined" 
values in subsequent computations of a refracted ray), and

(2) a lack of defensive programming in the image handling code (which 
"converts" the undefined values into an access violation).


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From: Stephen
Subject: h_Lathe_and_SOR_–_Beta_38
Date: 28 Aug 2010 17:04:00
Message: <4c7979c0$1@news.povray.org>
On 28/08/2010 8:05 PM, clipka wrote:
> Am 28.08.2010 20:27, schrieb Stephen:
>

>>> It is in my sent box (47K)
>>
>> I can see it using the web view and it is called

>>
>> I'm beginning to hate Thunderbird.
>
> Looks fine here, with T'bird also. In this case it's apparently the web
> interface that stumbles over a long (non-ASCII) dash you put in the
> subject.

It wasn't me. A big boy did it and ran away ;-)

The big boy's name is M$ Word.

-- 

Best Regards,
	Stephen


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From: Stephen
Subject: h_Lathe_and_SOR_–_Beta_38
Date: 28 Aug 2010 17:08:41
Message: <4c797ad9$1@news.povray.org>
On 28/08/2010 8:31 PM, clipka wrote:
> The root cause is a combination of
>
> (1) a problem with either the sor or lathe object, returning "undefined"
> as the surface normal at a certain point (which leads to "undefined"
> values in subsequent computations of a refracted ray), and
>

If you remove either the SOR or the lath or the skysphere the scene 
renders OK.

> (2) a lack of defensive programming in the image handling code (which
> "converts" the undefined values into an

Actually looking at both the SOR and the lathe in OpenGL (Bishop3D) 
shows an ugly turn at the base. I will remodel them even if it leaves 
gaps between the glass and the liquid.

Thanks Christoph.
-- 

Best Regards,
	Stephen


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