Using the following code for a (sky) sphere in a scene, with light 
source well outside the sphere:

#declare T_sky =
texture {
   pigment {
     gradient y
     pigment_map {
       [0.0 srgb <1.0,0.7,0.6>*1 transmit 0.5]
       [1.0 srgb <0.8,0.1,0.0>*1 transmit 0.5]
     }
   }
   finish {
     emission 0.9
     diffuse 0.0
   }
}

#declare T_cosmos =
texture {
   pigment {
     color rgbt <0,0,0,1>
   }
   finish {
     ambient 0.0
     diffuse 0.0
   }
}

sphere {
   <0,0,0>,1
   texture {T_sky}
   interior_texture {T_cosmos}
   no_shadow
   no_reflection
   inverse
   scale 99.9*10e4
}

works correctly until the above scale value. Use a value of >=100*10e4 
and the sphere becomes black.

Is this normal for version 3.7 RC5? I seem to remember that with lower 
versions of POV-Ray on could go at least to 10e6. Especially with the 
Ringworld scenes back in 2010 the scales used where much larger without 
any black out.

Working with windows version of POV-Ray and Win7 x64

Thomas

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