The recent discussion about Arnold in the renderman newsgroup got me
interested in trying the specific hemispherical light effect in POV.
Apparently Arnold uses a kind of spherical area light to achieve the
effect, which should be possible to add to POV I would think.  Anyway, I
tried doing it with just a sky_sphere - It only took 10 minutes to
render but the shadows still look stinky.  this scene has no lights,
radiosity settings as follows:

global_settings {
ini_option "+QR"

//radiosity{recursion_limit 5 brightness 1.2 normal on}

radiosity {
   pretrace_start 0.16
   pretrace_end 0.02 //0.08
    count 600
    nearest_count 4
    error_bound .3
    recursion_limit 1

    low_error_factor 1
    gray_threshold 0.5
    minimum_reuse 0.015
    brightness 1.5
    normal on
    max_sample 1

    adc_bailout 0.01/1  // CHANGE - use adc_bailout = 0.01 /
brightest_ambient_object
  }

}

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