> Hi,
>
> I have activated radiosity with the default settings and modified my plasma:
> union{
>          sphere{ 0,1
>                  pigment { rgbt 1 } hollow
>                  interior{
>                          media{
>                                  emission 6
>                                  density{
>                                          spherical density_map{
>                                                  [0 rgb 0]
>                                                  [0.1 rgb <.5,.1,.5>]
>                                                  [0.2 rgb <1,.8,1>]
>                                                  [1 rgb 1]
>                                          }
>                                  }
>                          }
>                  }
>          }
>          light_source{0 color rgb<1,0,1> area_light 0.6*x 0.6*z 5 5 circular
>          orient adaptive 0}
>          scale <0.4,.5,.4>
> }
>
> The results are now way better. I will check the other advices next week.
>
>

Another advice:
Declare your plasma as an object like this:
#declare Plasma=union{.....}

That way, you only have to define ot once if you want yo use several 
plasma "flames".

You can now use "Plasma" by itself to place that object at it's default 
location, or use:
object{Plasma rotate Rotation translate Location}

to place it anywhere you want.

You should place your scale statement before the light. Uneven scaling 
don't play well with circular area_light. It generate a warning and undo 
the uneven scaling. It can result in unexpected behaviour.



Alain

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