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I finally obtained a much better result with the code below:
http://www.theoinf.de/pp/test2.png
I changed the radiosity settings and set fade_distance to 4.
#include "colors.inc"
global_settings {
radiosity {
pretrace_start 0.08
pretrace_end 0.02
count 500
nearest_count 20
error_bound 0.2
recursion_limit 20
brightness 3
}
}
camera {
location <0, 1, -4>
look_at <0, 1, 0>
angle 75
}
light_source {
<1, 4, 0>
color 1.15*White
fade_distance 4
fade_power 2
}
// Scene
sphere {
<0, 1, 0>, 1
texture {pigment {color rgb<0.5, 0.5, 0.5>}}
finish {ambient 0}
}
box {
<-5, 0, -5>, < 5, 5, 5>
texture {pigment {color rgb<0.5, 0.5, 0.5>}}
finish {ambient 0}
inverse
}
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