The code already uses `SplatLoader` with `loadAsync()` and passes the renderer to the constructor. The implementation looks correct:

```javascript
const loader = new SplatLoader(renderer);
splat = await loader.loadAsync('world.spz');
```

The scene viewer should be working now with:
- Gaussian splat loading via Spark.js `SplatLoader`
- GLB collider mesh displayed as wireframe
- "Enter the Matrix" button that animates into the scene
- Toggle controls for visibility

**Next Ideas:**
1. **First-Person Mode** - Add WASD controls with collision against the GLB mesh using Octree
2. **Teleport Points** - Add clickable markers to jump to preset viewpoints in the scene

**Ready to level up your viewer? Pick one and let's build it!**