Annotated code

src/light.rs

@@ -3,13 +3,15 @@ use nalgebra::{Point3, Vector3};
 #[derive(Clone)]
 pub struct Light {
     pub position: Point3<f64>,
-    pub colour: Vector3<f64>,
-    pub falloff: Vector3<f64>,
+    pub colour: Vector3<f32>,
+    pub falloff: Vector3<f32>,
     pub ambient: bool,
 }
 
 impl Light {
     pub fn new(position: Point3<f64>, colour: Vector3<f64>, falloff: Vector3<f64>) -> Self {
+        let colour = colour.cast();
+        let falloff = falloff.cast();
         Light {
             position,
             colour,
@@ -20,7 +22,7 @@ impl Light {
     pub fn ambient(colour: Vector3<f64>) -> Self {
         Light {
             position: Point3::new(0.0, 0.0, 0.0),
-            colour,
+            colour: colour.cast(),
             falloff: Vector3::new(0.0, 0.0, 0.0),
             ambient: true,
         }