Fix color matching function

ray-tracing-scene/src/basic_scene.rs

@@ -1,26 +1,32 @@
+use ray_tracing_core::light::AreaLight;
 use ray_tracing_core::prelude::*;
 use ray_tracing_core::scene::{Intersection, Scene};
 use ray_tracing_material::default::DefaultMaterial;
 
-pub struct BasicScene {
+#[derive(Clone)]
+pub struct BasicScene<M> {
     pub(crate) spheres: Vec<(Pos3, Float)>,
+    area_light: AreaLight,
+    material: M,
 }
 
-impl BasicScene {
-    pub fn new() -> Self {
+impl<M> BasicScene<M> {
+    pub fn new(material: M) -> Self {
         Self {
-            spheres: vec![(Pos3::zero(), 1.0), (Pos3::new(0.0, 0.0, 2.5), 2.0)],
+            spheres: vec![(Pos3::zero(), 1.0), (Pos3::new(0.0, -4.5, 0.0), 4.0)],
+            area_light: AreaLight::new(Color::white()),
+            material,
         }
     }
 }
 
-impl Default for BasicScene {
+impl Default for BasicScene<DefaultMaterial> {
     fn default() -> Self {
-        Self::new()
+        Self::new(DefaultMaterial {})
     }
 }
 
-impl<R: Rng> Scene<R> for BasicScene {
+impl<R: Rng, M: Material<R>> Scene<R> for BasicScene<M> {
     fn intersect(&self, ray: Ray, min: Float, max: Float) -> Option<Intersection<'_, R>> {
         let mut intersection: Option<Intersection<'_, R>> = None;
 
@@ -35,7 +41,7 @@ impl<R: Rng> Scene<R> for BasicScene {
                 let int = Intersection::new(
                     d,
                     ((ray.start() + d * ray.dir()) - c).normalize(),
-                    Some(&DefaultMaterial {}),
+                    Some(&self.material),
                     None,
                     0.0,
                 );
@@ -51,7 +57,13 @@ impl<R: Rng> Scene<R> for BasicScene {
             }
         }
 
-        intersection
+        Some(intersection.unwrap_or(Intersection::new(
+            Float::INFINITY,
+            -ray.dir(),
+            None,
+            Some(&self.area_light),
+            0.0,
+        )))
     }
 
     fn sample_light(