> I think the blue is good the way it is. could you post an examle of
> the code for how you aplied the ambient and radiosity?
>
If you don't have 3.5 I can't help you.
I suggest that you first read the docs about radiosity and then play a bit
with the settings to get a feeling of how it works. You should also take a
look at rad_def.inc
This is just thrown together in a minute, don't expect very good settings.

global_settings {
  assumed_gamma 1
  radiosity {
    pretrace_start 0.04           // start pretrace at this size
    pretrace_end   0.02           // end pretrace at this size
    count 200                      // higher -> higher quality (1..1600)
[35]
    nearest_count 5               // higher -> higher quality (1..10) [5]
    error_bound 0.1               // higher -> smoother, less accurate [1.8]
    recursion_limit 2             // how much interreflections are
calculated (1..5+)

    low_error_factor .5           // reduce error_bound during last pretrace
step
    gray_threshold 0.0            // increase for weakening colors (0..1)
[0]
    minimum_reuse 0.015           // reuse of old radiosity samples [0.015]
    brightness 1                  // brightness of radiosity effects (0..1)
[1]

    adc_bailout 0.01/2     /*
    normal on                   // take surface normals into account [off]
    media on                    // take media into account [off]
    save_file "file_name"       // save radiosity data
    load_file "file_name"       // load saved radiosity data
    always_sample off           // turn sampling in final trace off [on]
    max_sample 1.0              // maximum brightness of samples */
  }
}

camera{
  location <0,5,-4>
  sky <0.5,0,1>
  direction <0,0,1>
  right x*image_width/image_height
  up y
  angle 60
  look_at <0,0,0>}

sphere{<1,1,-1.5>,1
  pigment{rgb 1}
  finish{ambient 0 diffuse 1}}

plane{y,0
  pigment{checker rgb 0.8,1}
  finish{diffuse 1 ambient 0}}

box{<-2,0,-1><2,3,1>
  pigment{red 1}
  finish{ambient 2}}

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