As far as I can tell, the code is correct. But if your triangles are flat,
why not use "triangle" instead of "smooth_triangle"?

Like so:
> #declare v1=<-6.3,1.67916373510155,-0.1>;
> #declare v2=<-5.1,1.60116644662657,-0.1>;
> #declare v3=<-4.4,0.327210734868637,0>;
> triangle  { v1 v2 v3
>  material { Gri  scale 1 }
>           no_reflection
> }

It makes no sense to use smooth_triangle when you're not actually "bending"
the normals.

Regards,
Tim

-- 
"Tim Nikias v2.0"
Homepage: <http://www.nolights.de>

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