shader node_westin_bsdf(
	color Color = 0.8,
	float Roughness = 0.5,
	float Edginess = 0.2,
	normal Normal = N,
	output closure color Sheen = 0,
	output closure color Backscatter = 0)
{
	Sheen = Color * westin_sheen(Normal, Roughness);
	Backscatter = Color * westin_backscatter(Normal, Edginess);
}