В максе окклюжн описывается
declare shader
color "mib_amb_occlusion" (
integer "samples" default 16,
color "bright" default 1 1 1 1,
color "dark" default 0 0 0 0,
scalar "spread" default 0.8,
scalar "max_distance" default 0,
boolean "reflective" default off,
integer "output_mode" default 0,
boolean "occlusion_in_alpha" default off,
# Version 2 parameters
scalar "falloff" default 1.0,
integer "id_inclexcl" default 0,
integer "id_nonself" default 0
)
version 2
apply texture, light