Add multiple light support.

rtchallenge/examples/eoc7.rs

@@ -95,7 +95,7 @@ fn main() -> Result<()> {
     };
 
     let mut world = World::default();
-    world.light = Some(light);
+    world.lights = vec![light];
     world.objects = vec![floor, left_wall, right_wall, middle, right, left];
 
     let image = camera.render(&world);

rtchallenge/examples/eoc8.rs

@@ -35,7 +35,10 @@ fn main() -> Result<()> {
     let height = 1440;
     let light_position = Tuple::point(-10., 10., -10.);
     let light_color = WHITE;
-    let light = PointLight::new(light_position, light_color);
+    let light1 = PointLight::new(light_position, light_color);
+    let light_position = Tuple::point(10., 10., -10.);
+    let light_color = Color::new(0.0, 0.0, 1.0);
+    let light2 = PointLight::new(light_position, light_color);
     let mut camera = Camera::new(width, height, PI / 4.);
     let from = Tuple::point(0., 1.5, -5.);
     let to = Tuple::point(0., 1., 0.);
@@ -82,7 +85,7 @@ fn main() -> Result<()> {
     let mut right = Sphere::default();
     right.set_transform(Matrix4x4::translation(1.5, 0.5, -0.5) * Matrix4x4::scaling(0.5, 0.5, 0.5));
     right.material = Material {
-        color: Color::new(0.5, 1., 0.1),
+        color: Color::new(1., 1., 1.),
         diffuse: 0.7,
         specular: 0.3,
         ..Material::default()
@@ -100,7 +103,7 @@ fn main() -> Result<()> {
     };
 
     let mut world = World::default();
-    world.light = Some(light);
+    world.lights = vec![light1, light2];
     world.objects = vec![floor, left_wall, right_wall, middle, right, left];
 
     let image = camera.render(&world);