add beginning of visualization for statistics, unmodified from blog code

src/components/World/systems/Loop.js

@@ -0,0 +1,33 @@
+import { Clock } from "three";
+
+const clock = new Clock();
+
+class Loop {
+  constructor(camera, scene, renderer) {
+    this.camera = camera;
+    this.scene = scene;
+    this.renderer = renderer;
+    this.updatables = [];
+  }
+
+  start() {
+    this.renderer.setAnimationLoop(() => {
+      this.tick();
+      // render a frame
+      this.renderer.render(this.scene, this.camera);
+    });
+  }
+
+  stop() {
+    this.renderer.setAnimationLoop(null);
+  }
+
+  tick() {
+    const delta = clock.getDelta();
+    for (const object of this.updatables) {
+      object.tick(delta);
+    }
+  }
+}
+
+export { Loop };