wip: parallelization

src/objects/cube.rs

@@ -41,9 +41,4 @@ impl Hittable for Cube {
     fn hit(&self, r: &Ray) -> Option<Hit> {
         Hit::hit_list(&self.faces, r)
     }
-
-    fn normal_at(&self, _p: &Vec3) -> Vec3 {
-        // TODO: normal calc for cube
-        todo!()
-    }
 }