Run Detail
completedgrok-4.6Recorded for these videos
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Provider
openrouter
Challenge Version
v1.0
Turns
1
Duration
245.8s
Total Tokens
17,217
Input Tokens
912
Output Tokens
16,305
Reasoning Tokens
7,743
Reasoning Effort
default
Cached Input Tokens
128
Est. Cost
$0.0995
Started
8/27/2026, 12:04:58 PM
OR Provider
xAI
Finish Reason
stop
Generation ID
gen-1787832298-TWGA1fpbmNNEKe7gM8xB
Turns (1)
Turn #1
912 in16,305 out7,743 reasoning128 cached17,217 total245.8s
user
You are a game developer who ships browser demos that have to work on the first click, in front of an audience, on someone else's laptop.
Build me a Tesla Cybertruck monster-truck rally as one self-contained HTML page. A fairly small stadium, a big crowd in the stands, artificial hills and debris across the floor, and trucks slamming into each other.
Then make it match the spec below exactly. The spec is the challenge; a great-looking rally that ignores it is a miss.
The build
- One file. Everything — HTML, CSS, JS — in a single
.htmlpage. No build step. Saved to disk and double-clicked, it runs. - One external request, maximum. You may load three.js from a CDN, pinned to an exact version. That is the only network request the page is permitted to make. No second library, no font, no stylesheet, no image file, no audio file.
- Sound is optional, and if you include it, generate it with the Web Audio API. No audio assets.
- No storage. No
localStorage,sessionStorage, cookies orindexedDB. It runs in a sandboxed frame where touching them throws.
The spec
- Exactly five trucks. One the player drives, four rivals under AI. Not four, not six — five.
- Name the arena. Invent a name for the venue and show it in the HUD, on screen, during play.
- The HUD shows the arena name, a score, and a clock. Nothing else is required.
- At least three distinct obstacle types on the floor — the trucks should have something to hit besides each other.
- A crowd in the stands that is visibly a crowd, all the way round.
- Drive with the keyboard. Arrow keys or WASD. Say which in the HUD or an overlay.
- Collisions matter. Ramming a rival does something — score, a visible reaction, a wreck state. Your call, but it must be visible.
Two modes that are not the game
Both are checkable in ten seconds, which is why they are here.
#demo— if the page URL ends in#demo, the game starts with 20 seconds on the clock and the score already at 5000. This must run through the real game state, not a cosmetic overlay. Everything else behaves normally.Pfor photo mode — pressingPfreezes the action and overlays the arena name and the current score, held untilPis pressed again. The simulation stops; it does not keep playing behind the card.
Answer in exactly these sections
The pitch
One sentence: the name of your rally and what it looks like.
The game
Exactly one fenced html block containing the whole page and nothing else.
The notes
Exactly four bullets.
- Five trucks: how you kept four AI rivals from clumping into one moving wall.
- Demo mode: the line of real game state
#demosets, and why it is not an overlay. - Photo mode: what you actually stop when
Pis pressed — the render loop, the physics step, or both. - Collisions: one short paragraph on the collision model you implemented. Not what it looks like — what it computes.
assistant
The pitch
GigaCrush at The Stainless Coliseum is a five-truck dirt-bowl brawl of angular Cybertrucks slamming over hills, boulders and barricades while a packed crowd rings the stands.
The game
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>GigaCrush — The Stainless Coliseum</title>
<style>
* { margin: 0; padding: 0; box-sizing: border-box; }
html, body { width: 100%; height: 100%; overflow: hidden; background: #0b1018; font-family: ui-sans-serif, system-ui, Segoe UI, sans-serif; }
canvas { display: block; }
#hud {
position: fixed; left: 0; right: 0; top: 0; padding: 14px 18px 10px;
color: #f3f6fa; pointer-events: none; text-shadow: 0 1px 2px #000, 0 0 12px #000;
display: flex; justify-content: space-between; align-items: flex-start; gap: 12px;
z-index: 5;
}
#arenaName { font-size: 18px; letter-spacing: 0.22em; font-weight: 700; }
#arenaName span { display: block; font-size: 11px; letter-spacing: 0.28em; opacity: 0.7; font-weight: 600; margin-top: 3px; }
#stats { text-align: right; font-variant-numeric: tabular-nums; }
#stats .score { font-size: 28px; font-weight: 800; letter-spacing: 0.06em; }
#stats .clock { font-size: 18px; letter-spacing: 0.12em; opacity: 0.9; margin-top: 2px; }
#hint { position: fixed; left: 18px; bottom: 14px; color: #d7dde6; font-size: 12px; letter-spacing: 0.14em; text-transform: uppercase; pointer-events: none; text-shadow: 0 1px 2px #000; z-index: 5; opacity: 0.85; }
#photo {
display: none; position: fixed; inset: 0; z-index: 8;
background: rgba(6, 8, 14, 0.62); color: #fff;
align-items: center; justify-content: center; flex-direction: column;
text-align: center; letter-spacing: 0.18em;
}
#photo.on { display: flex; }
#photo .kicker { font-size: 12px; opacity: 0.7; margin-bottom: 10px; }
#photo .nm { font-size: 34px; font-weight: 800; }
#photo .sc { font-size: 22px; margin-top: 14px; font-variant-numeric: tabular-nums; }
#photo .sub { font-size: 11px; opacity: 0.65; margin-top: 28px; }
</style>
</head>
<body>
<div id="hud">
<div id="arenaName">THE STAINLESS COLISEUM<span>GIGACRUSH RALLY</span></div>
<div id="stats">
<div class="score" id="scoreEl">SCORE 0</div>
<div class="clock" id="clockEl">TIME 1:00</div>
</div>
</div>
<div id="hint">WASD or Arrow keys to drive · P photo mode · ram rivals to score</div>
<div id="photo">
<div class="kicker">PHOTO MODE</div>
<div class="nm" id="photoName">THE STAINLESS COLISEUM</div>
<div class="sc" id="photoScore">SCORE 0</div>
<div class="sub">PRESS P TO RESUME</div>
</div>
<script src="https://cdn.jsdelivr.net/npm/three@0.160.0/build/three.min.js"></script>
<script>
(function () {
const ARENA = 36;
const ARENA_NAME = "THE STAINLESS COLISEUM";
const demo = location.hash === "#demo";
let score = demo ? 5000 : 0;
let timeLeft = demo ? 20 : 60;
let photoMode = false;
let audioCtx = null;
const keys = Object.create(null);
const codeOn = (c) => !!keys[c];
const scene = new THREE.Scene();
scene.background = new THREE.Color(0x151c28);
scene.fog = new THREE.Fog(0x151c28, 55, 130);
const camera = new THREE.PerspectiveCamera(55, innerWidth / innerHeight, 0.1, 200);
camera.position.set(0, 18, 28);
const renderer = new THREE.WebGLRenderer({ antialias: true });
renderer.setPixelRatio(Math.min(devicePixelRatio, 2));
renderer.setSize(innerWidth, innerHeight);
renderer.shadowMap.enabled = true;
renderer.shadowMap.type = THREE.PCFSoftShadowMap;
document.body.appendChild(renderer.domElement);
scene.add(new THREE.HemisphereLight(0xb9c6d6, 0x3a2a18, 0.7));
const sun = new THREE.DirectionalLight(0xffe6c8, 1.15);
sun.position.set(-30, 42, 18);
sun.castShadow = true;
sun.shadow.mapSize.set(1024, 1024);
sun.shadow.camera.near = 10;
sun.shadow.camera.far = 110;
sun.shadow.camera.left = -50;
sun.shadow.camera.right = 50;
sun.shadow.camera.top = 50;
sun.shadow.camera.bottom = -50;
scene.add(sun);
const fill = new THREE.DirectionalLight(0x88a0c0, 0.25);
fill.position.set(20, 10, -30);
scene.add(fill);
const hills = [
{ x: 12, z: -10, r: 9, h: 3.2 },
{ x: -14, z: 8, r: 8, h: 2.6 },
{ x: 6, z: 14, r: 7, h: 2.2 },
{ x: -8, z: -14, r: 10, h: 3.6 },
{ x: 0, z: 0, r: 5.5, h: 1.4 }
];
function terrainHeight(x, z) {
let h = 0;
for (let i = 0; i < hills.length; i++) {
const hill = hills[i];
const d = Math.hypot(x - hill.x, z - hill.z);
if (d < hill.r) {
const t = 1 - d / hill.r;
h += hill.h * t * t * (3 - 2 * t);
}
}
return h;
}
const dirtMat = new THREE.MeshStandardMaterial({ color: 0x6a5438, roughness: 0.95, metalness: 0.02 });
const floorGeo = new THREE.CircleGeometry(ARENA + 5, 80);
const pos = floorGeo.attributes.position;
for (let i = 0; i < pos.count; i++) {
const x = pos.getX(i), y = pos.getY(i);
pos.setZ(i, terrainHeight(x, y));
}
floorGeo.computeVertexNormals();
const floor = new THREE.Mesh(floorGeo, dirtMat);
floor.rotation.x = -Math.PI / 2;
floor.receiveShadow = true;
scene.add(floor);
for (let i = 0; i < hills.length; i++) {
const hill = hills[i];
const bump = new THREE.Mesh(
new THREE.SphereGeometry(hill.r, 18, 12),
dirtMat
);
bump.scale.y = (hill.h / hill.r) * 0.95;
bump.position.set(hill.x, 0.02, hill.z);
bump.receiveShadow = true;
bump.castShadow = true;
scene.add(bump);
}
const wallMat = new THREE.MeshStandardMaterial({ color: 0x3a3f48, roughness: 0.8, metalness: 0.2 });
const wall = new THREE.Mesh(new THREE.CylinderGeometry(ARENA + 0.6, ARENA + 0.6, 1.6, 64, 1, true), wallMat);
wall.position.y = 0.8;
wall.receiveShadow = true;
scene.add(wall);
const standMat = new THREE.MeshStandardMaterial({ color: 0x2a3038, roughness: 0.9 });
for (let s = 0; s < 7; s++) {
const inner = ARENA + 2.2 + s * 1.55;
const ring = new THREE.Mesh(new THREE.RingGeometry(inner, inner + 1.65, 72), standMat);
ring.rotation.x = -Math.PI / 2;
ring.position.y = 1.4 + s * 0.92;
ring.receiveShadow = true;
scene.add(ring);
}
const fascia = new THREE.Mesh(
new THREE.CylinderGeometry(ARENA + 13.2, ARENA + 13.2, 8, 64, 1, true),
new THREE.MeshStandardMaterial({ color: 0x1c222b, roughness: 0.85, side: THREE.DoubleSide })
);
fascia.position.y = 5.2;
scene.add(fascia);
(function crowd() {
const bodyGeo = new THREE.BoxGeometry(0.32, 1.05, 0.28);
const headGeo = new THREE.BoxGeometry(0.22, 0.22, 0.22);
const bodyMat = new THREE.MeshLambertMaterial({ color: 0xffffff });
const headMat = new THREE.MeshLambertMaterial({ color: 0xffffff });
const N = 2200;
const bodies = new THREE.InstancedMesh(bodyGeo, bodyMat, N);
const heads = new THREE.InstancedMesh(headGeo, headMat, N);
const dummy = new THREE.Object3D();
const col = new THREE.Color();
let n = 0;
for (let row = 0; row < 7; row++) {
const r = ARENA + 2.9 + row * 1.55;
const count = Math.floor(14 + r * 3.15);
for (let k = 0; k < count && n < N; k++) {
const a = (k / count) * Math.PI * 2 + row * 0.07;
const y = 1.95 + row * 0.92 + (Math.random() * 0.12);
dummy.position.set(Math.cos(a) * r, y, Math.sin(a) * r);
dummy.rotation.set(0, a + Math.PI, (Math.random() - 0.5) * 0.15);
dummy.scale.set(0.9 + Math.random() * 0.25, 0.75 + Math.random() * 0.55, 0.9);
dummy.updateMatrix();
bodies.setMatrixAt(n, dummy.matrix);
col.setHSL((Math.random() * 0.15 + [0.0, 0.08, 0.55, 0.62, 0.95][n % 5]) % 1, 0.55, 0.42 + Math.random() * 0.18);
bodies.setColorAt(n, col);
dummy.position.y += 0.62 * dummy.scale.y;
dummy.scale.set(1, 1, 1);
dummy.updateMatrix();
heads.setMatrixAt(n, dummy.matrix);
col.setHSL(0.08, 0.35, 0.38 + Math.random() * 0.35);
heads.setColorAt(n, col);
n++;
}
}
bodies.count = n;
heads.count = n;
scene.add(bodies);
scene.add(heads);
})();
const obstacles = [];
function addStatic(mesh, x, z, radius, kind) {
mesh.position.set(x, terrainHeight(x, z) + (mesh.userData.lift || 0), z);
mesh.castShadow = true;
mesh.receiveShadow = true;
scene.add(mesh);
obstacles.push({ x: x, z: z, r: radius, kind: kind, mesh: mesh });
}
const rockMat = new THREE.MeshStandardMaterial({ color: 0x5c5852, roughness: 0.92, metalness: 0.05 });
const rockSpots = [[-22, -6], [-18, 16], [20, 9], [16, -18], [-6, 22], [22, -4], [-10, -22], [8, -24]];
for (let i = 0; i < rockSpots.length; i++) {
const g = new THREE.DodecahedronGeometry(1.1 + Math.random() * 0.7, 0);
const m = new THREE.Mesh(g, rockMat);
m.rotation.set(Math.random(), Math.random(), Math.random());
m.userData.lift = 0.7;
addStatic(m, rockSpots[i][0], rockSpots[i][1], 1.6, "boulder");
}
const barMat = new THREE.MeshStandardMaterial({ color: 0x8a9180, roughness: 0.7, metalness: 0.15 });
const bars = [
[10, 4, 1.2], [-16, -2, 0.4], [4, -16, 2.1], [-4, 12, 0.9], [18, 18, 3.6]
];
for (let i = 0; i < bars.length; i++) {
const m = new THREE.Mesh(new THREE.BoxGeometry(3.4, 1.1, 0.55), barMat);
m.rotation.y = bars[i][2];
m.userData.lift = 0.55;
addStatic(m, bars[i][0], bars[i][1], 1.7, "barrier");
}
const scrapMat = new THREE.MeshStandardMaterial({ color: 0x6d4a2a, roughness: 0.55, metalness: 0.45 });
const scraps = [[-24, 8], [14, 22], [24, -14], [-20, 22], [0, -20], [8, 8]];
for (let i = 0; i < scraps.length; i++) {
const grp = new THREE.Group();
for (let k = 0; k < 4; k++) {
const box = new THREE.Mesh(new THREE.BoxGeometry(0.7 + Math.random(), 0.35 + Math.random() * 0.5, 0.5 + Math.random()), scrapMat);
box.position.set((Math.random() - 0.5) * 1.4, k * 0.28, (Math.random() - 0.5) * 1.4);
box.rotation.set(Math.random() * 0.6, Math.random() * 2, Math.random() * 0.6);
box.castShadow = true;
grp.add(box);
}
grp.userData.lift = 0.4;
addStatic(grp, scraps[i][0], scraps[i][1], 1.5, "scrap");
}
function makeTruck(tint, accent) {
const g = new THREE.Group();
const bodyMat = new THREE.MeshStandardMaterial({ color: tint, metalness: 0.88, roughness: 0.28 });
const darkMat = new THREE.MeshStandardMaterial({ color: 0x111111, metalness: 0.7, roughness: 0.15 });
const body = new THREE.Mesh(new THREE.BoxGeometry(2.15, 0.62, 4.5), bodyMat);
body.position.y = 1.42;
body.castShadow = true;
g.add(body);
const skirt = new THREE.Mesh(new THREE.BoxGeometry(2.25, 0.22, 4.55), bodyMat);
skirt.position.y = 1.12;
g.add(skirt);
const cabin = new THREE.Mesh(new THREE.BoxGeometry(2.05, 0.62, 2.05), bodyMat);
cabin.position.set(0, 1.88, -0.55);
cabin.castShadow = true;
g.add(cabin);
const glass = new THREE.Mesh(new THREE.BoxGeometry(1.95, 0.42, 1.7), darkMat);
glass.position.set(0, 1.95, -0.62);
g.add(glass);
const nose = new THREE.Mesh(new THREE.BoxGeometry(2.12, 0.12, 2.3), bodyMat);
nose.position.set(0, 1.62, 1.55);
nose.rotation.x = -0.48;
g.add(nose);
const bar = new THREE.Mesh(new THREE.BoxGeometry(1.7, 0.08, 0.08), new THREE.MeshStandardMaterial({ color: accent, emissive: accent, emissiveIntensity: 0.8 }));
bar.position.set(0, 1.38, 2.28);
g.add(bar);
const wheelGeo = new THREE.CylinderGeometry(0.72, 0.72, 0.42, 10);
const wheelMat = new THREE.MeshStandardMaterial({ color: 0x171717, roughness: 0.9 });
const wheels = [];
const wp = [[-1.12, 0.72, 1.45], [1.12, 0.72, 1.45], [-1.12, 0.72, -1.45], [1.12, 0.72, -1.45]];
for (let i = 0; i < 4; i++) {
const w = new THREE.Mesh(wheelGeo, wheelMat);
w.rotation.z = Math.PI / 2;
w.position.set(wp[i][0], wp[i][1], wp[i][2]);
w.castShadow = true;
g.add(w);
wheels.push(w);
}
scene.add(g);
return { group: g, body: body, bodyMat: bodyMat, wheels: wheels };
}
const truckDefs = [
{ tint: 0xdfe6ee, accent: 0xff6a00, player: true },
{ tint: 0x1c1e22, accent: 0xff3344, player: false },
{ tint: 0xb08a2a, accent: 0xffee88, player: false },
{ tint: 0x8a949e, accent: 0x44ddff, player: false },
{ tint: 0x3a4650, accent: 0x88ff66, player: false }
];
const spawn = [
[0, 8],
[14, -6],
[-12, -8],
[10, 16],
[-16, 10]
];
const trucks = [];
for (let i = 0; i < 5; i++) {
const vis = makeTruck(truckDefs[i].tint, truckDefs[i].accent);
const t = {
vis: vis,
x: spawn[i][0],
z: spawn[i][1],
y: 0,
yaw: Math.random() * Math.PI * 2,
vx: 0, vz: 0, vy: 0,
speed: 0,
spin: 0,
radius: 2.15,
wrecked: 0,
flash: 0,
player: i === 0,
aiTimer: Math.random(),
aiTx: spawn[i][0],
aiTz: spawn[i][1],
orbitR: 12 + i * 4.5,
orbitW: (i % 2 === 0 ? 1 : -1) * (0.22 + i * 0.05),
phase: i * 1.4,
chase: i === 1 || i === 3,
sepBias: 1.1 + i * 0.35
};
trucks.push(t);
}
const scoreEl = document.getElementById("scoreEl");
const clockEl = document.getElementById("clockEl");
const photoEl = document.getElementById("photo");
const photoScore = document.getElementById("photoScore");
function fmtTime(t) {
const s = Math.max(0, Math.ceil(t));
const m = Math.floor(s / 60);
const r = s % 60;
return (m > 0 ? m + ":" : "0:") + (r < 10 ? "0" : "") + r;
}
function paintHud() {
scoreEl.textContent = "SCORE " + score;
clockEl.textContent = "TIME " + fmtTime(timeLeft);
}
paintHud();
function boom(impact) {
if (!audioCtx) return;
const o = audioCtx.createOscillator();
const g = audioCtx.createGain();
o.type = "square";
o.frequency.value = 60 + impact * 8;
g.gain.setValueAtTime(Math.min(0.12, impact * 0.012), audioCtx.currentTime);
g.gain.exponentialRampToValueAtTime(0.001, audioCtx.currentTime + 0.18);
o.connect(g);
g.connect(audioCtx.destination);
o.start();
o.stop(audioCtx.currentTime + 0.2);
}
function ensureAudio() {
if (!audioCtx) {
const AC = window.AudioContext || window.webkitAudioContext;
if (AC) audioCtx = new AC();
}
if (audioCtx && audioCtx.state === "suspended") audioCtx.resume();
}
window.addEventListener("keydown", function (e) {
keys[e.code] = true;
if (["ArrowUp", "ArrowDown", "ArrowLeft", "ArrowRight", "KeyW", "KeyA", "KeyS", "KeyD", "KeyP", "Space"].indexOf(e.code) >= 0) {
e.preventDefault();
}
if (e.code === "KeyP" && !e.repeat) {
photoMode = !photoMode;
photoEl.classList.toggle("on", photoMode);
photoScore.textContent = "SCORE " + score;
document.getElementById("photoName").textContent = ARENA_NAME;
}
ensureAudio();
});
window.addEventListener("keyup", function (e) { keys[e.code] = false; });
function driveToward(t, tx, tz, dt, maxSpd) {
const dx = tx - t.x, dz = tz - t.z;
const want = Math.atan2(dx, dz);
let diff = want - t.yaw;
while (diff > Math.PI) diff -= Math.PI * 2;
while (diff < -Math.PI) diff += Math.PI * 2;
t.yaw += Math.max(-2.4 * dt, Math.min(2.4 * dt, diff));
t.speed += (maxSpd - t.speed) * Math.min(1, dt * 2.2);
}
function updateAI(dt, now) {
for (let i = 1; i < 5; i++) {
const t = trucks[i];
if (t.wrecked > 0) {
t.speed *= 0.96;
continue;
}
t.aiTimer -= dt;
if (t.aiTimer <= 0) {
t.aiTimer = 0.8 + (i * 0.35) + Math.random() * 1.4;
const ang = now * t.orbitW + t.phase;
if (t.chase && Math.random() < 0.55) {
t.aiTx = trucks[0].x + Math.cos(ang) * 6;
t.aiTz = trucks[0].z + Math.sin(ang) * 6;
} else {
t.aiTx = Math.cos(ang) * t.orbitR;
t.aiTz = Math.sin(ang) * t.orbitR;
}
}
let sx = 0, sz = 0;
for (let j = 0; j < 5; j++) {
if (j === i) continue;
const o = trucks[j];
const dx = t.x - o.x, dz = t.z - o.z;
const d = Math.hypot(dx, dz) || 0.0001;
const infl = 12 * t.sepBias;
if (d < infl) {
const f = (infl - d) / infl;
sx += (dx / d) * f;
sz += (dz / d) * f;
}
}
const tx = t.aiTx + sx * 10;
const tz = t.aiTz + sz * 10;
driveToward(t, tx, tz, dt, 11 + i * 0.6);
}
}
function collidePair(a, b, movableB) {
const dx = b.x - a.x, dz = b.z - a.z;
const dist = Math.hypot(dx, dz);
const minD = a.radius + b.radius;
if (dist >= minD || dist < 1e-4) return 0;
const nx = dx / dist, nz = dz / dist;
const overlap = minD - dist;
if (movableB) {
a.x -= nx * overlap * 0.5;
a.z -= nz * overlap * 0.5;
b.x += nx * overlap * 0.5;
b.z += nz * overlap * 0.5;
} else {
a.x -= nx * overlap;
a.z -= nz * overlap;
}
const bvx = movableB ? b.vx : 0;
const bvz = movableB ? b.vz : 0;
const relN = (a.vx - bvx) * nx + (a.vz - bvz) * nz;
if (relN >= 0) return 0;
const massB = movableB ? 1 : 1e9;
const inv = 1 / 1 + 1 / massB;
const e = movableB ? 0.48 : 0.35;
const j = -(1 + e) * relN / inv;
a.vx += j * nx;
a.vz += j * nz;
if (movableB) {
b.vx -= j * nx;
b.vz -= j * nz;
a.spin += nz * j * 0.08;
b.spin -= nz * j * 0.08;
} else {
a.spin += (Math.random() - 0.5) * 0.6;
}
return Math.abs(j);
}
function collisions() {
for (let i = 0; i < 5; i++) {
for (let j = i + 1; j < 5; j++) {
const impact = collidePair(trucks[i], trucks[j], true);
if (impact > 3.2) {
trucks[i].flash = trucks[j].flash = 0.18;
boom(impact);
if (trucks[i].player || trucks[j].player) {
const gain = Math.floor(impact * 18);
if (timeLeft > 0) score += gain;
const other = trucks[i].player ? trucks[j] : trucks[i];
if (impact > 11) other.wrecked = Math.max(other.wrecked, 1.6);
} else if (impact > 14) {
trucks[j].wrecked = Math.max(trucks[j].wrecked, 1.1);
}
}
}
}
for (let i = 0; i < 5; i++) {
const t = trucks[i];
for (let k = 0; k < obstacles.length; k++) {
const o = obstacles[k];
const dummy = { x: o.x, z: o.z, vx: 0, vz: 0, radius: o.r, spin: 0 };
const impact = collidePair(t, dummy, false);
if (impact > 6) {
t.flash = 0.12;
if (t.player && timeLeft > 0) score += 5;
}
}
}
}
function integrate(t, dt, isPlayer) {
if (isPlayer && t.wrecked <= 0) {
const up = codeOn("KeyW") || codeOn("ArrowUp");
const dn = codeOn("KeyS") || codeOn("ArrowDown");
const lf = codeOn("KeyA") || codeOn("ArrowLeft");
const rt = codeOn("KeyD") || codeOn("ArrowRight");
if (up) t.speed += 22 * dt;
if (dn) t.speed -= 16 * dt;
t.speed = Math.max(-8, Math.min(16.5, t.speed));
const steer = (lf ? 1 : 0) - (rt ? 1 : 0);
t.yaw += steer * dt * 2.3 * (t.speed >= 0 ? 1 : -1) * Math.min(1, Math.abs(t.speed) / 4 + 0.2);
}
t.speed *= Math.pow(0.985, dt * 60);
const fx = Math.sin(t.yaw), fz = Math.cos(t.yaw);
t.vx += (fx * t.speed - t.vx) * Math.min(1, dt * 8);
t.vz += (fz * t.speed - t.vz) * Math.min(1, dt * 8);
t.vx *= Math.pow(0.92, dt * 60);
t.vz *= Math.pow(0.92, dt * 60);
t.x += t.vx * dt;
t.z += t.vz * dt;
t.yaw += t.spin * dt;
t.spin *= Math.pow(0.9, dt * 60);
const d = Math.hypot(t.x, t.z);
const lim = ARENA - 2.4;
if (d > lim) {
const nx = t.x / d, nz = t.z / d;
t.x = nx * lim;
t.z = nz * lim;
const push = t.vx * nx + t.vz * nz;
if (push > 0) {
t.vx -= 1.4 * push * nx;
t.vz -= 1.4 * push * nz;
}
t.speed *= 0.7;
}
const ground = terrainHeight(t.x, t.z);
const targetY = ground;
if (t.y > targetY + 0.05) {
t.vy -= 22 * dt;
t.y += t.vy * dt;
if (t.y < targetY) { t.y = targetY; t.vy *= -0.25; }
} else {
t.y = t.y + (targetY - t.y) * Math.min(1, dt * 12);
const ghx = terrainHeight(t.x + fx, t.z + fz) - ground;
if (ghx > 0.35 && t.speed > 6) t.vy = 5 + ghx * 2;
t.y = Math.max(t.y, targetY);
}
if (t.wrecked > 0) t.wrecked -= dt;
if (t.flash > 0) t.flash -= dt;
}
function syncMesh(t, dt) {
const g = t.vis.group;
g.position.set(t.x, t.y, t.z);
const tilt = t.wrecked > 0 ? 0.45 * Math.min(1, t.wrecked) : 0;
g.rotation.set(tilt * 0.15, t.yaw, tilt);
const spin = t.speed * dt * 2.2;
for (let i = 0; i < 4; i++) t.vis.wheels[i].rotation.x += spin;
t.vis.bodyMat.emissive.setHex(t.flash > 0 ? 0xffffff : 0x000000);
t.vis.bodyMat.emissiveIntensity = t.flash > 0 ? 0.55 : 0;
}
const look = new THREE.Vector3();
const camGoal = new THREE.Vector3();
let last = performance.now();
function tick(now) {
requestAnimationFrame(tick);
const dt = Math.min(0.05, (now - last) / 1000);
last = now;
if (!photoMode) {
const t0 = trucks[0];
updateAI(dt, now * 0.001);
integrate(t0, dt, true);
for (let i = 1; i < 5; i++) integrate(trucks[i], dt, false);
collisions();
if (timeLeft > 0) {
timeLeft -= dt;
if (timeLeft < 0) timeLeft = 0;
}
paintHud();
for (let i = 0; i < 5; i++) syncMesh(trucks[i], dt);
const fx = Math.sin(t0.yaw), fz = Math.cos(t0.yaw);
camGoal.set(t0.x - fx * 13, t0.y + 7.2, t0.z - fz * 13);
camera.position.lerp(camGoal, 1 - Math.pow(0.001, dt));
look.set(t0.x + fx * 4, t0.y + 1.4, t0.z + fz * 4);
camera.lookAt(look);
}
renderer.render(scene, camera);
}
requestAnimationFrame(tick);
window.addEventListener("resize", function () {
camera.aspect = innerWidth / innerHeight;
camera.updateProjectionMatrix();
renderer.setSize(innerWidth, innerHeight);
});
})();
</script>
</body>
</html>
The notes
- Five trucks: Each rival has its own orbit radius, angular rate, phase offset and retarget interval, mixed chase/patrol goals, and a scaled separation steer so they peel apart instead of stacking into one wall.
- Demo mode: If
location.hash === "#demo", the livetimeLeftandscorevariables (the same ones the HUD, scoring, and clock tick use) start at 20 and 5000 — not a cosmetic overlay. - Photo mode: The physics step is skipped (integration, AI, collisions, clock, camera follow, mesh sync); the render loop keeps running so the frozen frame and overlay stay visible.
- Collisions: Trucks and obstacles are circles in XZ; overlap is positional correction along the contact normal, then an equal-mass (or infinite-mass for statics) impulse from relative velocity along that normal with restitution, plus a yaw impulse from the hit.
Attachments
x-ai/grok-4.6 — page