pub fn connect_bdpt<'a>( scene: &'a Scene, light_vertices: &[Vertex<'a>], camera_vertices: &[Vertex<'a>], s: usize, t: usize, light_distr: Arc<Distribution1D>, camera: &'a Arc<Camera>, sampler: &mut Sampler, p_raster: &mut Point2f, mis_weight_opt: Option<&mut Float>) -> Spectrum
