declare shader
    color "blinn" (
        color  "ambient"              default 0 0 0,
        color  "diffuse"              default 1 1 1,
	color  "specular"             default 0 0 0,
	scalar "avg_microfacet_slope" default .2,
	scalar "index_of_refraction"  default 3,
        array light "lights"
    )
    version 1
    apply material
end declare