declare shader
    geometry "hair_geo_4v" (
	string "name",
        scalar "radius" default .1,
	vector "v1" default -1.5 0 0,
	vector "v2" default  -.5 0 0,
	vector "v3" default   .5 0 0,
	vector "v4" default  1.5 0 0,
	integer "approximation" default 2,
	integer "degree" default 1
    )
    version 1
    apply material
end declare