On 16/10/2025 13:43, Alain Martel wrote:
> It looks like your material have a rather high ambient value. That make 
> that gold look as if it was plastic. Try setting ambient 0.

Thanks for suggestion, but it's already == 0:
--------------------------------------------
#declare F_metal  =
finish {
     reflection {0, 1 fresnel on }
     conserve_energy
     brilliance 5
     ambient 0
     diffuse .5
     phong 5
     phong_size 40
     metallic
     specular .4
     roughness 1/20
     reflection .5
}
--------------------------------------------
YB

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