Function rs_pbrt::integrators::bdpt::random_walk

pub fn random_walk<'a>(
    scene: &'a Scene,
    ray: &Ray,
    sampler: &mut Sampler,
    beta: &mut Spectrum,
    pdf: Float,
    max_depth: u32,
    mode: TransportMode,
    path: &mut Vec<Vertex<'a>>
) -> usize