LightBeam nous apporta ses lumieres ainsi en ce 2004/04/02 16:01... :

> IYou cannot really do "glows" like this but...
>
> I removed "ambient_light 0" and the sphere appears !
> then
> I made some changes, add a plane to see the "light" spread on a floor...
> Try this :
>
> global_settings{
>    assumed_gamma 1.0
>    //ambient_light 0
>
>      radiosity
>      {
>        normal on
>        pretrace_start 0.08
>        pretrace_end   0.01
>        count 100
>        nearest_count 10
>        error_bound 0.02
>        recursion_limit 1
>        low_error_factor 0.2
>        gray_threshold 0.0
>        minimum_reuse 0.015
>        brightness 1.0
>        adc_bailout 0.01/2
>    }
>  }
>
> plane {y, -1.0 pigment {rgb 0.8}}
>
> camera {
>  location <5, 5, 5>
>  look_at <0, 0, 0>
>  }
>
> union {
>  light_source {0.0, 1.0}
>   sphere { <0,0,0>, 1 pigment { rgb 1.0 }  finish {ambient 1.0 diffuse 
> 0.0}}
>   }

Remove the light and there is absolutely NO difference. The light is at 
the center of the opaque sphere.

Alain

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