Rubik's Cube · kimi-k3

Let me check the working directory and three.min.js version quickly, then write index.html.

Plan:
- Build 27 cubies (3x3x3), each a small box with colored sticker faces via materials array (6 materials per cubie; internal faces black/dark).
- Colors: standard: white U (y+), yellow D (y-), green F (z+), blue B (z-), red R (x+), orange L (x-).
- Moves: rotate a layer group around axis, animate 90° over ~250ms, then commit cubie positions (rotate positions and orientations via group transform applied to cubies).
- Queue moves; buttons disabled during animation? Better: queue moves so scramble works; disable buttons during animation but queue internal calls. Requirement: "queue or disable further moves until it completes". I'll implement a queue; buttons push to queue. Scramble pushes ~20 random moves. Reset clears queue and restores solved cube + camera.
- Camera controls: manual orbit — pointer drag on canvas background rotates spherical camera; but dragging on cube should not turn a face (only background orbits — actually spec says dragging the background orbits the camera; simplest: any drag orbits camera). "Dragging the background orbits the camera without turning a face." I'll just orbit on any drag; no face-turn dragging needed.
- Wheel zoom bounded between min/max radius.
- Verify with browser tool: click U then U', screenshot; orbit; reset.

Implementation details:

Cubie creation: BoxGeometry(size, size, size) with small gap. Materials: array of 6 MeshBasicMaterial? Use MeshLambertMaterial with lights, or MeshBasicMaterial with slightly shaded colors. Use Lambert + ambient + directional for nicer look. Materials per cubie: [+x, -x, +y, -y, +z, -z]; color if coordinate matches outer face else dark gray #111.

Move application: axis ('x','y','z'), layer (-1,0,1), direction (+1/-1 quarter turn). Create THREE.Group at scene root, attach cubies of that layer (use group.attach to preserve world transform), animate group.rotation[axis] from 0 to dir*PI/2 with easing, then on complete: for each cubie, apply matrix update: scene.attach(cubie) (bakes transform), then round positions to integers and round rotation to nearest 90°. Rounding: position.set(Math.round...). Rotation rounding: set quaternion from Euler rounded. Simpler: after attach, update matrixWorld, decompose, then snap: position components rounded to nearest integer; quaternion — build from Euler angles snapped to nearest PI/2.

Snap function:
```js
cubie.position.set(Math.round(cubie.position.x), ...);
const e = new THREE.Euler().setFromQuaternion(cubie.quaternion);
e.x = Math.round(e.x/(Math.PI/2))*(Math.PI/2); // etc
cubie.quaternion.setFromEuler(e);
```
Euler decomposition might give weird combos but snapping each to nearest 90 should be fine.

Move definitions:
- U: axis y, layer +1, dir -1 (standard notation U is clockwise looking at U face = negative rotation around +y). Visual correctness of clockwise-ness isn't critical but let's do standard: U clockwise viewed from top → rotation around y axis by -90° (since right-handed, positive rotation around +y appears counterclockwise viewed from +y). So U: dir=-1. U': dir=+1.
- D: layer y=-1, clockwise viewed from below (-y) → +90° around y: dir=+1. D': -1.
- R: x=+1, clockwise viewed from +x → -90°: dir=-1. L: x=-1 → +90°: dir=+1.
- F: z=+1 → -90° around z: dir=-1. B: z=-1 → +90°: dir=+1.

Queue: moves array, processing flag. enqueue(move) pushes and if idle, start next. Animation with requestAnimationFrame timing or in render loop with clock. I'll use the render loop: if currentMove, advance t.

Camera: spherical coords radius ~7, theta, phi. Update camera.position from spherical, lookAt(0,0,0). Drag: pointerdown/move/up on renderer canvas, track deltas, theta -= dx*0.005, phi clamp [0.15, PI-0.15]... keep phi between ~0.2 and ~2.94. Wheel: radius clamp [4.5, 14], radius *= 1 + deltaY*0.001.

Buttons: 12 move buttons + Scramble + Reset. Layout: top bar.

Reset: stop queue, if a move animating, finish instantly? Simplest: clear queue, cancel animation by committing current rotation immediately, then rebuild cube from scratch (remove all cubies, recreate solved). Reset camera spherical to initial values. Rebuilding from scratch guarantees solved state.

Scramble: 20 random moves from 18 (avoid immediate same-axis inverse repeats optionally). Enqueue all.

Buttons disabled during animation? Requirement says queue OR disable. Queue is fine — keep buttons enabled, they enqueue. But maybe limit queue length to avoid huge backlog; cap at, say, 50.

Edge case: Reset during animation: commit current partial rotation — I'll just cancel animation and rebuild; group children get disposed with rebuild. When rebuilding, remove pivot group children back? Simpler: keep track of all cubies array; on reset, remove pivot group from scene (if any), remove all cubie meshes, dispose, and recreate.

Verification via browser tool: load page, screenshot, click U, wait, click U'... buttons have ids. Use browser click at coordinates of buttons. Also can evaluate? Browser tool only click/type/scroll/etc. I'll click buttons by coordinates after screenshot.

Also check console via inspect.

three.min.js version — check revision to ensure API (THREE.Group attach exists since forever; sRGB in newer versions). Check quickly.

Let me write the file.

Sticker approach: materials array on BoxGeometry: order is [+x, -x, +y, -y, +z, -z]. Good.

Gap: cubie size 0.95, spacing 1 → visible boundaries. Also add slight bevel? Not needed.

Add background color, nice lighting: ambient 0.6, directional 0.8 at (5,10,7). Lambert materials.

Write code.

Initial camera: theta = 0.6, phi = 1.1, radius 7.5 — cube fully visible (3x3 cube ~3 units; with fov 45 and radius 7.5, fits fine).

Resize handling.

Scramble move labels and notation display? Optional status line showing last moves. Keep simple: status text showing queue length / last move.

Now write index.html.

Animation duration 220ms per quarter turn; scramble maybe faster — just same.

Easing: easeInOutQuad or smoothstep.

Code:

```js
const moves = { U:{axis:'y',layer:1,dir:-1}, ... };
```

During animation: pivot.rotation[axis] = dir * (PI/2) * ease(t).

On complete: pivot.updateMatrixWorld(); for each child cubie: pivot.remove? Use scene.attach(cubie) then snap. Then scene.remove(pivot).

Let me write everything.

For raycast not needed.

Wheel zoom: canvas.addEventListener('wheel', e=>{e.preventDefault(); radius = clamp(radius*(1+e.deltaY*0.001), 4.5, 14);}).

Pointer events with setPointerCapture.

Status div updates.

Buttons: create dynamically with labels U U' D D' L L' R R' F F' B B'.

Now verification: screenshot initial, click U button, screenshot mid/after, click U' wait, screenshot compare, drag to orbit, screenshot, click Reset, screenshot. Timing: animations 250ms; clicks need waits — browser tool click presumably instant; I can use bash sleep? No, the browser actions happen sequentially; I may need a wait. There's no explicit wait action; motion/scroll etc. take time. I can use bash with sleep to pass time between? The browser runs in real time presumably; a bash sleep 1 should let animation finish. I'll do that.

Also console errors: use browser inspect which shows console maybe. "inspect" inspects DOM/console.

Write the file now.

Three.js r128. Group.attach exists (since r104?). attach was added in r104? Object3D.attach added in r104. Fine. MeshLambertMaterial fine.

Write index.html.

Solved cube looks good. Now test U then U'. U button at ~(144,25). Click, wait, screenshot; click U' (180,25), wait, screenshot.

Caught mid-animation (Turning U, top layer rotated with red on front). Wait and then screenshot the completed state.

U completed correctly: top row front = red (from R), right column = blue (from B). Correct for U clockwise. Now U' to restore.

U + U' returned to solved. Now test orbit drag, then scramble, then reset. Drag from (600,500) to (300,300) on background.

Orbit works — now seeing blue (B), orange (L), yellow (D) faces, cube still solved from other side. Now Scramble, wait ~20*0.25s = 5s+, then screenshot; then Reset and screenshot.

Scramble is running through the queue (queued: 19). Wait ~6 seconds for 20 moves × 230ms ≈ 4.6s, then screenshot.

Scrambled properly — cubies moved (state preserved, mixed colors, all cubie boundaries intact). Now Reset and check solved + initial framing.

Reset restored the solved cube and initial camera framing exactly. All required checks pass. Done — report.