ft: normal mapping

src/camera.rs

@@ -235,7 +235,10 @@ impl Camera {
         let closest = Hit::hit_list(hittables, r);
         if let Some(hit) = closest {
             if let Some((scattered, att)) = hit.mat().scatter(&hit, r) {
-                return att * self.ray_colour(hittables, &scattered, depth - 1);
+                if let Some(ray) = scattered {
+                    return att * self.ray_colour(hittables, &ray, depth - 1);
+                }
+                return att;
             }
             return Colour::default();
         }