> The light source shouldn't be inside the media object.
>
> The media object is the target for photons to be deposited on.
>
> The media statement in global photons controls the balance
> between photons deposited on media and on normal surfaces.
> Something like media 1000,0.1 will make most of the photons
> deposit in the media.

thank you but, these lines

sphere{<0,0,0>,1 hollow texture{pigment{gradient <0,1,0> color_map{[0.0 color
Black][0.8 color rgb<0.1,0.6,0.9>][1.0 color rgb<0.1,0.6,0.9>]}}finish {ambient
1 diffuse 0}}scale 10000}

#declare Scatter_M = material {texture {pigment { rgbt 1 }finish {ambient 0
diffuse 0}} interior {media {method 3 intervals 1 samples 70, 1000 scattering
{1, rgb 0.1 extinction 0.00001}}}}
sphere {<0,0,0>, 400 hollow material { Scatter_M }  photons {pass_through }}

aren't present for the simulation. The second block is only to see the beam.
Unfortunately, my problem is still present.

Thank you again
Sylvain

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