Less debugging.
More dimension.

Threesmith doctor: 5 error(s), 8 warning(s), review 73/100 (C), three r187, none (import map / CDN)

1. ✖ Why the scene shows nothing (or nothing right) (1): nothing else can be judged while the picture is black or empty
   [add-gltf-result] main.js:27
     GLTFLoader hands over an object holding scene, animations and cameras, not an Object3D: scene.add(gltf) logs "object not an instance of THREE.Object3D" and the model never shows. Fix: scene.add( gltf.scene );

2. ✖ Assets that will not load (2): a missing or mis-cased file is a 404, which the loader reports as a parse error far from the cause
   [asset-missing] main.js:22
     "/textures/crate.jpg" is not in the project (looked in public/textures/crate.jpg, textures/crate.jpg). The server answers with an HTML page, which the loader then fails to parse ("Unexpected token '<'"). Fix: Add the file under public/ (served at /), or fix the path.
   [asset-case] main.js:26
     "/models/Robot.glb" only matches public/models/robot.glb with different capitals: it loads on macOS and Windows and is a 404 on Linux servers and most hosts. Fix: Write the path exactly as the file is named (/models/robot.glb), or rename the file.

3. ✖ Outdated or removed three.js API (3): removed names throw or silently do nothing in the installed release
   [buffer-geometry-alias] main.js:18 (three_fix)
     `BoxBufferGeometry` and friends were renamed; the plain name is the BufferGeometry now.
   [addons-path] x2 index.html:8, main.js:3 (three_fix)
     `three/examples/jsm/...` still works, but `three/addons/...` is the documented path and the one import maps use.

4. ✖ Colours (2): wrong colour spaces make everything look washed out or too dark
   [output-encoding] main.js:7 (three_fix)
     `outputEncoding` was replaced by `outputColorSpace`.
   [texture-colorspace-missing] main.js:23
     Textures loaded with TextureLoader are used as color maps but `colorSpace` is never set, so colors look washed out or too dark. Fix: texture.colorSpace = THREE.SRGBColorSpace; (not for normal/roughness/metalness data maps).

5. ▲ Code that runs but does the wrong thing (4): these are bugs the user will see
   [controls-no-element] main.js:15
     Controls created without a DOM element listen to nothing (since r175 they need one), so mouse and touch do nothing. Fix: new OrbitControls( camera, renderer.domElement ), or call controls.connect( element ) later.
   [controls-damping-no-update] main.js:16
     `enableDamping` only works when controls.update() runs every frame. Fix: Call controls.update() inside the animation loop.
   [rotation-degrees] main.js:19
     Rotations are in radians; 45 here is about 7 turns, not 45 degrees. Fix: Use radians: THREE.MathUtils.degToRad( 45 ) (Math.PI / 4).
   [clip-action-unused] main.js:29
     clipAction() only creates the action; nothing plays until .play() is called on it. Fix: mixer.clipAction( clip ).play();

6. ▲ Performance (3): work per frame and GPU memory decide whether it runs smoothly on a phone
   [pixel-ratio-uncapped] main.js:8 (three_fix)
     `setPixelRatio(devicePixelRatio)` renders up to 9-16x the pixels on high-density screens.
   [alloc-in-loop] main.js:34
     A Vector/Matrix/Quaternion/Color is created with `new` inside the per-frame loop. That produces garbage every frame and causes stutter from garbage collection. Fix: Create the object once outside the loop (const _v = new THREE.Vector3()) and reuse it with .set()/.copy().
   [animation-loop] main.js:33
     `renderer.setAnimationLoop` is the supported loop: it also runs in WebXR and pauses correctly. Fix: renderer.setAnimationLoop((time) => { ...; renderer.render(scene, camera); });

7. ▲ Resize and cleanup (1): leaks and stretched views show up after the first minutes of use
   [no-resize-handling] main.js:6
     A renderer and camera exist but nothing reacts to a resize (no resize listener or ResizeObserver). Fix: On resize: camera.aspect = w / h; camera.updateProjectionMatrix(); renderer.setSize(w, h);

Next:
  1. Call three_fix (dry run), then three_fix write: true for the mechanical renames.
  2. Fix the asset paths (three_assets lists every reference and where it was looked for).
  3. Fix the 'shows nothing' group first, then confirm with three_check (screenshot) or three_inspect (why objects are not visible).
  4. Fix the remaining 1 error(s) by hand; three_api gives the exact names for the installed release.
  5. Call three_review with only_new: true after each change, until no errors are left.
  6. Run three_check on the page (index.html) before you call it done.