m = mental_ray_string_options
for i = 1 to m.numOptions do m.removeOption 0
m.addOption "environment lighting resolution" 4096
m.addOption "environment dome ground" on
m.addOption "environment dome rotation axis" [0,0,1]
m.addOption "environment dome ground position" [0,0,0]
m.addOption "environment dome radius" 2000
m.addOption "environment dome ground reflectivity" [-1.0,-1.0,-1.0]
m.addOption "environment dome mode" "hemisphere"
m.addOption "environment dome ground texturescale" -200.0