POV-Ray : Newsgroups : povray.bugreports : T_Stone18 Server Time: 18 Jan 2019 00:58:50 GMT
  T_Stone18 (Message 1 to 2 of 2)  
From: Anthony D  Baye
Subject: T_Stone18
Date: 29 Feb 2016 02:35:00
Message: <web.56d3ae22a7e78f08fd6b6fe10@news.povray.org>
causes an assertion failure in the backend when used with subsurface scattering.

backend/render/trace.cpp:3654 void
pov::Trace::ComputeDiffuseAmbientContribution1(...): Assertion 'ambientcolour[j]
>= 0' failed.

Regards,
A.D.B.


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From: Jim Holsenback
Subject: Re: T_Stone18
Date: 29 Feb 2016 15:22:41
Message: <56d46241@news.povray.org>
On 2/28/2016 9:34 PM, Anthony D. Baye wrote:
> causes an assertion failure in the backend when used with subsurface scattering.
>
> backend/render/trace.cpp:3654 void
> pov::Trace::ComputeDiffuseAmbientContribution1(...): Assertion 'ambientcolour[j]
>> = 0' failed.
>
> Regards,
> A.D.B.
>
>

are you perhaps using T_Stone18 in conjunction with SSLT?

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

"T_Crack4" has a "zero color component" (Black) contained in it's 
definition (T_Crack4) is used by T_Stone18 ... see item #2 in the 
warnings ... maybe it's /not/ your case, but thought it was worth 
mentioning. Copy the definitions into your local scene file and change 
it (Black) to <1e-6,1e-6,1e-6> and see if that helps


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