I've made a quick test with a scene :

1st render :
pretrace_start 0.08
pretrace_end 0.02
error_bound 0.1
low_error_factor 1
always_sample off
save_file "rad1.data"

and 2nd render :
pretrace_start 0.08
pretrace_end 0.02
error_bound 0.8
low_error_factor .125
always_sample off
save_file "rad2.data"

and rad1.data is 3 times bigger than rad2.data.. !
Hmm, so there's something I don't get with low_error_factor neither :)


As a side note here is a little trick to render radiosity scenes with the
2-pass approach, using animation options :

// +w300 +h300 +KFF2

#if (frame_number=1)
      pretrace_start 0.08
      pretrace_end 0.02
      error_bound 0.2
      save_file "rad.data"
#else
      pretrace_start 1
      pretrace_end 1
      error_bound 0.6
      always_sample off
      load_file "rad.data"
#end

works nicely but you can't have different antialiasing/resolution options
for each pass

M

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