POV-Ray : Newsgroups : povray.beta-test : Subsurface, random core Server Time
29 Dec 2024 10:47:50 EST (-0500)
  Subsurface, random core (Message 1 to 5 of 5)  
From: Le Forgeron
Subject: Subsurface, random core
Date: 18 Aug 2012 11:46:28
Message: <502fb8d4@news.povray.org>
Greetings,

I was just playing around with subsurface, and got a crash:

povray: render/trace.cpp:3452: void
pov::Trace::ComputeOneSingleScatteringContribution(const
pov::LightSource &, const pov::Intersection &, double, double, double,
pov_base::GenericRGBColour<float> &, double, const pov::Vector3d &,
double, double, pov::Trace::TraceTicket &): Assertion `(factor >= 0.0)
&& (factor <= 1.7976931348623157e+308)' failed.

It's a bit lock with the compiler:
 * if I use the gcc compiled povray, it survives and render the attached
png.
 * if I use the icpc compiled povray, it crash.

It seems the crash appears when the cyan pixel get computed.

Any clue about subsurface ? Did I forget something ?

(And yes, the picture is ugly, but it's mine and sort of minimal :)


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Attachments:
Download 'thick.pov.txt' (2 KB) Download 'thick.png' (123 KB)

Preview of image 'thick.png'
thick.png


 

From: Le Forgeron
Subject: Re: Subsurface, random core
Date: 18 Aug 2012 12:05:25
Message: <502fbd45$1@news.povray.org>
Le 18/08/2012 17:46, Le_Forgeron nous fit lire :

> Any clue about subsurface ? Did I forget something ?

I should read the big Warning in the wiki!
Shame on me.


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From: Cousin Ricky
Subject: Re: Subsurface, random core
Date: 19 Aug 2012 21:30:01
Message: <web.5031921a9bfa994185de7b680@news.povray.org>
Le_Forgeron <jgr### [at] freefr> wrote:
> Le 18/08/2012 17:46, Le_Forgeron nous fit lire :
>
> > Any clue about subsurface ? Did I forget something ?

I don't know, but my render looks a bit different.  The cyan border is much
thicker, and surrounds the entire object.

> I should read the big Warning in the wiki!
> Shame on me.

Speaking of documentation, it also says not to use zero as a channel value.  I
tried it with rgb <1,0.01,0.01>, and it looks much different.  It also took


I've posted my results in p.b.i.


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From: Woody
Subject: Re: Subsurface, random core
Date: 30 Aug 2012 09:05:00
Message: <web.503f64089bfa994149b4acd50@news.povray.org>
Le_Forgeron <jgr### [at] freefr> wrote:
> Le 18/08/2012 17:46, Le_Forgeron nous fit lire :
>
> > Any clue about subsurface ? Did I forget something ?
>
> I should read the big Warning in the wiki!
> Shame on me.

To what in the wiki are you refering to?  Do you have a link?


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From: Le Forgeron
Subject: Re: Subsurface, random core
Date: 30 Aug 2012 09:11:02
Message: <503f6666$1@news.povray.org>
Le 30/08/2012 15:00, Woody a écrit :
> Le_Forgeron <jgr### [at] freefr> wrote:
>> Le 18/08/2012 17:46, Le_Forgeron nous fit lire :
>>
>>> Any clue about subsurface ? Did I forget something ?
>>
>> I should read the big Warning in the wiki!
>> Shame on me.
> 
> To what in the wiki are you refering to?  Do you have a link?
> 
> 


> http://wiki.povray.org/content/Reference:Finish#Subsurface_Light_Transport


The warning is the last paragraph before the Highligts title


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