Add initial MIS implementation

ray-tracing-scene/src/basic_scene.rs

@@ -37,6 +37,7 @@ impl<R: Rng> Scene<R> for BasicScene {
                     ((ray.start() + d * ray.dir()) - c).normalize(),
                     Some(&DefaultMaterial {}),
                     None,
+                    0.0,
                 );
                 if d >= min && d <= max {
                     if let Some(i) = intersection.as_ref() {