On 18-1-2019 15:27, And wrote:
> //#declare trunk_13=
> #declare PR_DIFFUSE=pigment {color rgb <0.056,0.058,0.036> transmit 0/100 }
> 
> 
> #declare F1=finish{
>                     diffuse  1
>                     oren_nayar 1.117
>                     }
> 
[snip]

oren_nayar? I suppose that is a macro you wrote yourself based on this 
reflectance model? It does not seem to be mentioned in the POV-Ray docs...

-- 
Thomas

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