Added scene, raytracer, pixel display and lights

src/light.rs

@@ -0,0 +1,23 @@
+use nalgebra::{Point3, Vector3};
+
+pub struct Light {
+    pub colour: Vector3<f32>,
+    pub position: Point3<f32>,
+    pub falloff: [f32; 3],
+}
+
+impl Light {
+    pub fn new(colour: Vector3<f32>, position: Point3<f32>, falloff: [f32; 3]) -> Self {
+        Light {
+            colour,
+            position,
+            falloff,
+        }
+    }
+    pub fn white() -> Self {
+        let colour = Vector3::new(1.0, 1.0, 1.0);
+        let position = Point3::new(0.0, 0.0, 0.0);
+        let falloff = [1.0, 0.0, 0.0];
+        Light::new(colour, position, falloff)
+    }
+}