mode set
src_dst 2 2
   src_blend 0
   fill 1
   cantor_dust 1

src_dst 2 1
   src_blend 1
   src_range 0.6 1
   menger_sponge 3

src_dst 2 0
   fill_noise 3 1.6 0.3
   src_blend 1
   map_range 0 1 0.1 0.3

   src_range 0.3 1
   fill 0
   map_range 0.3 1 0 0

src_dst 0 1
   src_range 0.001 1
   src_blend 1
   fill

   #show_range_sector_type A4 4