Small Update, Alain:

I copied your code and made small adaptions. But due to the fact, that I
still have no full understanding of what I am doing here ( :-) ), I
produce errors at the location where I use your "257, 33".

------------------------------------

 #declare MyLight = union
 {
  light_source
  {
   4999.8*(z+0.1)// Location  - small difference to walls (0.1)
   760.0*x*0.7   // Color?
   257, 33       // ? ERROR ---
   area_light    // Type
   < -1000.0, -1300.0, 0.1 > < 1000.0, -1300.0, 4999.9 > 3, 3 // Vectors?
   adaptive 0    //
   area_illumination on //
  }
  cylinder
  {
   0, 5000.0*z, 760.0
   pigment
   {
    radial
    color_map
    {
     [ 0.00 rgb  0.5 ]
     [ 0.05 rgbf < 0.8, 0.5, 0.2, 1.0 > ]
     [ 0.10 rgbf 1.0 ]
     [ 0.40 rgbf 1.0 ]
     [ 0.45 rgbf < 1.0, 0.7, 0.5, 1.0 > ]
     [ 0.50 rgb  0.5 ]
    }
    rotate 180*z
   }
//   interior_texture  // not yet in place. But shouldn't that cylinder
be hollow then?
   translate < 0.0, -10.0, 0.0 >
  }
 }

------------------------------------

On 14.02.2016 10:47, Alain did some écrit:
> area_light HabitatLength*z, AxleRadius*x*0.7, 257, 33 adaptive 0
> area_illumination
> 
> cylinder{0, HabitatLength*z, AxleRadius
>  pigment{radial
>   color_map{[0 rgb 0.5][0.05 rgbf<0.8, 0.5, 0.2, 1>][0.1 rgbf 1]
>   [0.4 rgbf 1][0.45 rgbf<1, 0.7, 0.5, 1>][0.5 rgb 0.5]}
>  rotate 180*z}
> }

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