Listing 1. Sample Input Scene for Radiance

!gensky 11 25 12 -a 33 -o 80

skyfunc glow skyglow
0
0
4 .9 .9 1 0

skyglow source sky
0
0
4 0 0 1 180

skyfunc glow ground_glow
0
0
4 1.4 .9 .6 0

ground_glow source ground
0
0
4 0 0 -1 180

# Brass material
void metal brass
0
0
5 0.68 0.27 0.002 0.95 0
# n  r g b specularity roughness

# Create a brass sphere of
# radius 3 at (0,0,5)
brass sphere my_sphere
0
0
4    0 0 5   3
# n x y z radius