# override all surface shaders
Surface "occlusionpass"
Option "render" "commands" "-Surface"

#enable occlusion prepass
Option "occlusion" "prepass" 1

#set quality attributes
Attribute "indirect" "maxerror" 0.1
Attribute "indirect" "maxpixeldist" 10
Attribute "indirect" "nsamples" 256

#set max distance to search for occluding objects
Attribute "indirect" "maxhitdist" [500]

Display "occlusion.#4f.png" "file" "rgb"
Option "render" "commands" "-Display"