Le 2022-01-21 à 09:52, Kenneth a écrit :
> // the large sky-sphere
> sphere{0, 1
> pigment{rgb .1}
>      finish{ambient 0 diffuse 0 emission 1}
>      scale 8000 // change to 50
>     // hollow on // does not seem to be necessary-- the media objects and
>                  // rad patches show up anyway
>      no_image
> }

Have you tried to replace that large sphere with a sky_sphere ? Or even 
a simple background statement if the pigment is solid ?
Some options :

background{ rgb 0.1 }

sky_sphere{
	pigment{ rgb 0.1 }
   }

sky_sphere{
  pigment{plnar{
	[0 rgb 0.1]
	[1 rgb 0]
	}
    }

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