pub struct DiffuseAreaLight;
pub struct DistantLight;
pub struct GonioPhotometricLight;
pub struct InfiniteAreaLight;
pub struct PointLight;
pub struct ProjectionLight;
pub struct SpotLight;

pub enum Light {
    DiffuseArea(Box<DiffuseAreaLight>),
    Distant(Box<DistantLight>),
    GonioPhotometric(Box<GonioPhotometricLight>),
    InfiniteArea(Box<InfiniteAreaLight>),
    Point(Box<PointLight>),
    Projection(Box<ProjectionLight>),
    Spot(Box<SpotLight>),
}