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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