Run Detail
completedgpt-6.1-terra-proRecorded for these videos
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Provider
openrouter
Challenge Version
v1.0
Turns
1
Duration
Batched — not timed
Total Tokens
42,287
Input Tokens
22,294
Output Tokens
19,993
Reasoning Tokens
4,118
Reasoning Effort
default
Est. Cost
$0.0611
Started
10/27/2026, 10:38:07 AM
OR Provider
OpenAI
Finish Reason
stop
Generation ID
gen-batch-1793097486-08eb14d5373322eac672
Turns (1)
Turn #1
22,294 in19,993 out4,118 reasoning42,287 total
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
Iron Halo Rally packs five angular monster trucks into a crowded, dirt-floored stadium for a chaotic metallic brawl.
The game
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Iron Halo Rally</title>
<link rel="icon" href="data:,">
<style>
* { box-sizing: border-box; }
html, body { margin: 0; width: 100%; height: 100%; overflow: hidden; }
body {
background: #10151c;
color: #fff;
font-family: Arial, Helvetica, sans-serif;
}
canvas { display: block; width: 100%; height: 100%; }
#hud {
position: absolute;
z-index: 2;
top: 18px;
left: 18px;
right: 18px;
display: flex;
justify-content: space-between;
align-items: flex-start;
gap: 12px;
pointer-events: none;
text-shadow: 0 2px 8px #000;
}
.panel {
background: rgba(11, 17, 23, .82);
border: 1px solid rgba(255, 255, 255, .22);
border-left: 4px solid #f3b846;
padding: 11px 15px;
box-shadow: 0 4px 20px rgba(0,0,0,.25);
}
.name {
color: #f3b846;
font-size: 12px;
font-weight: 900;
letter-spacing: .19em;
}
.value {
font-size: clamp(22px, 4vw, 35px);
font-weight: 900;
font-variant-numeric: tabular-nums;
}
.small {
margin-top: 4px;
color: #d4dde0;
font-size: 11px;
font-weight: 700;
letter-spacing: .06em;
}
#stats { text-align: right; min-width: 120px; }
#impact {
position: absolute;
z-index: 2;
top: 120px;
left: 50%;
transform: translateX(-50%);
color: #ffe08a;
font-weight: 900;
font-size: 20px;
text-shadow: 0 2px 6px #000;
opacity: 0;
pointer-events: none;
}
.cover {
position: absolute;
z-index: 5;
inset: 0;
display: none;
place-items: center;
background: rgba(5, 9, 14, .72);
text-align: center;
}
.cover.visible { display: grid; }
.card {
max-width: 90vw;
padding: 30px 42px;
background: rgba(15, 22, 29, .95);
border: 1px solid #8a7551;
box-shadow: 0 18px 70px #000a;
}
.card h1 {
color: #f3b846;
margin: 0 0 10px;
font-size: clamp(28px, 6vw, 54px);
letter-spacing: .05em;
}
.card p { margin: 8px 0; color: #e1e8e9; }
.card .big { color: white; font-size: 36px; font-weight: 900; }
#photo { z-index: 6; pointer-events: none; }
#error { z-index: 10; }
@media (max-width: 520px) {
#hud { top: 8px; left: 8px; right: 8px; }
.panel { padding: 8px 10px; }
.small { font-size: 9px; }
}
</style>
</head>
<body>
<div id="hud">
<div class="panel">
<div class="name">IRON HALO RALLY</div>
<div class="small">WASD / ARROWS: DRIVE · P: PHOTO</div>
</div>
<div id="stats" class="panel">
<div class="name">SCORE</div>
<div id="score" class="value">0</div>
<div id="clock" class="small">01:30</div>
</div>
</div>
<div id="impact"></div>
<div id="photo" class="cover">
<div class="card">
<div class="name">PHOTO MODE</div>
<h1>IRON HALO RALLY</h1>
<p>SCORE</p>
<div id="photoScore" class="big">0</div>
<p>Press P to resume</p>
</div>
</div>
<div id="finish" class="cover">
<div class="card">
<div class="name">FINAL SCORE</div>
<h1>TIME'S UP</h1>
<div id="finalScore" class="big">0</div>
<p>Press R to rally again</p>
</div>
</div>
<div id="error" class="cover">
<div class="card">
<h1>ENGINE UNAVAILABLE</h1>
<p>Three.js could not be loaded. Check the network connection and reopen this page.</p>
</div>
</div>
<!-- The sole external request. -->
<script src="https://cdn.jsdelivr.net/npm/three@0.160.1/build/three.min.js"></script>
<script>
(() => {
"use strict";
if (typeof THREE === "undefined") {
document.getElementById("error").classList.add("visible");
return;
}
const ARENA = "IRON HALO RALLY";
const isDemo = location.hash === "#demo";
const state = { time: isDemo ? 20 : 90, score: isDemo ? 5000 : 0, photo: false, over: false };
const scoreEl = document.getElementById("score");
const clockEl = document.getElementById("clock");
const photoEl = document.getElementById("photo");
const finishEl = document.getElementById("finish");
const impactEl = document.getElementById("impact");
const scene = new THREE.Scene();
scene.background = new THREE.Color(0x8395a2);
scene.fog = new THREE.Fog(0x8395a2, 65, 125);
const renderer = new THREE.WebGLRenderer({ antialias: true });
renderer.setPixelRatio(Math.min(window.devicePixelRatio || 1, 1.5));
renderer.setSize(window.innerWidth, window.innerHeight);
renderer.outputColorSpace = THREE.SRGBColorSpace;
renderer.toneMapping = THREE.ACESFilmicToneMapping;
renderer.toneMappingExposure = 1.1;
document.body.prepend(renderer.domElement);
const camera = new THREE.PerspectiveCamera(53, window.innerWidth / window.innerHeight, 0.1, 180);
const hemi = new THREE.HemisphereLight(0xcce7ff, 0x594433, 2.1);
scene.add(hemi);
const sun = new THREE.DirectionalLight(0xffe5bd, 2.5);
sun.position.set(-20, 35, 12);
scene.add(sun);
const mat = (color, extra = {}) => new THREE.MeshStandardMaterial({ color, ...extra });
const dirtMat = mat(0x755c47, { roughness: 1 });
const hillMat = mat(0x937555, { roughness: 1 });
const concreteMat = mat(0x515a5c, { roughness: 1 });
const railMat = mat(0xc2bba5, { metalness: .5, roughness: .6 });
const darkMat = mat(0x1b2229, { roughness: .85 });
const tireMat = mat(0x171b1d, { roughness: 1 });
const hubMat = mat(0xa4acac, { metalness: .75, roughness: .35 });
const glassMat = mat(0x172c36, { metalness: .55, roughness: .25 });
const lampMat = new THREE.MeshBasicMaterial({ color: 0xffebac });
const boxGeo = new THREE.BoxGeometry(1, 1, 1);
function box(parent, material, x, y, z, sx, sy, sz, ry = 0) {
const m = new THREE.Mesh(boxGeo, material);
m.position.set(x, y, z);
m.scale.set(sx, sy, sz);
m.rotation.y = ry;
parent.add(m);
return m;
}
function flatRing(inner, outer, y, material) {
const m = new THREE.Mesh(new THREE.RingGeometry(inner, outer, 128), material);
m.rotation.x = -Math.PI / 2;
m.position.y = y;
scene.add(m);
return m;
}
const floor = new THREE.Mesh(new THREE.CircleGeometry(35, 128), dirtMat);
floor.rotation.x = -Math.PI / 2;
scene.add(floor);
const lineMat = new THREE.MeshBasicMaterial({ color: 0xc9ae7d, side: THREE.DoubleSide });
flatRing(30.8, 31.05, .025, lineMat);
flatRing(19.8, 19.88, .024, lineMat);
flatRing(9.8, 9.88, .023, lineMat);
// Stepped annular stands and railings encircle the entire arena.
const standMaterial = mat(0x596267, { side: THREE.DoubleSide, roughness: 1 });
for (let row = 0; row < 7; row++) {
flatRing(35 + row * 1.75, 36.75 + row * 1.75, .5 + row * .7, standMaterial);
}
const wall = new THREE.Mesh(
new THREE.CylinderGeometry(35, 35, 1.6, 128, 1, true),
mat(0x39444a, { side: THREE.DoubleSide })
);
wall.position.y = .8;
scene.add(wall);
const wallStripe = new THREE.Mesh(
new THREE.CylinderGeometry(35.05, 35.05, .18, 128, 1, true),
mat(0xe0a83f, { side: THREE.DoubleSide })
);
wallStripe.position.y = 1.4;
scene.add(wallStripe);
// Instanced heads and torsos: a crowd, rather than a painted backdrop.
const crowdCount = 7 * 176;
const bodyMesh = new THREE.InstancedMesh(new THREE.BoxGeometry(.36, .5, .24), mat(0xffffff), crowdCount);
const headMesh = new THREE.InstancedMesh(new THREE.SphereGeometry(.15, 7, 5), mat(0xffffff), crowdCount);
const dummy = new THREE.Object3D();
const color = new THREE.Color();
const shirts = [0xce654c, 0x527f9b, 0xe7b65a, 0xd7d7c9, 0x6a8069, 0x883e44, 0x343e50];
const skins = [0xe9bb93, 0xbc8461, 0x795341, 0xf0cfad, 0x98694f];
let seed = 57421;
function rand() {
seed = (seed * 1664525 + 1013904223) >>> 0;
return seed / 4294967296;
}
let ci = 0;
for (let row = 0; row < 7; row++) {
for (let j = 0; j < 176; j++) {
const a = (j + (row % 2) * .5 + (rand() - .5) * .25) / 176 * Math.PI * 2;
const r = 35.85 + row * 1.75 + (rand() - .5) * .25;
const y = .5 + row * .7;
dummy.position.set(Math.sin(a) * r, y + .28, Math.cos(a) * r);
dummy.rotation.set(0, a, 0);
dummy.scale.set(1, .8 + rand() * .35, 1);
dummy.updateMatrix();
bodyMesh.setMatrixAt(ci, dummy.matrix);
bodyMesh.setColorAt(ci, color.setHex(shirts[Math.floor(rand() * shirts.length)]));
dummy.position.y = y + .69;
dummy.rotation.set(0, 0, 0);
dummy.scale.set(1, 1, 1);
dummy.updateMatrix();
headMesh.setMatrixAt(ci, dummy.matrix);
headMesh.setColorAt(ci, color.setHex(skins[Math.floor(rand() * skins.length)]));
ci++;
}
}
scene.add(bodyMesh, headMesh);
// Floodlight towers around the rim.
for (let i = 0; i < 8; i++) {
const a = i * Math.PI / 4;
const x = Math.sin(a) * 48, z = Math.cos(a) * 48;
box(scene, darkMat, x, 6.5, z, .45, 13, .45);
const rack = new THREE.Group();
rack.position.set(x, 12.8, z);
rack.rotation.y = a;
scene.add(rack);
box(rack, darkMat, 0, 0, 0, 4.4, .55, .5);
for (let k = -2; k <= 2; k++) box(rack, lampMat, k * .8, 0, -.28, .55, .34, .08);
}
// Raised ellipsoids are driveable hills. Their visible shape and height
// function use the same ellipse.
const hills = [
{ x: -13, z: -12, rx: 5.2, rz: 3.8, h: 1.65 },
{ x: 13, z: 11, rx: 4.8, rz: 3.5, h: 1.45 },
{ x: -13, z: 14, rx: 3.8, rz: 4.3, h: 1.15 },
{ x: 14, z: -15, rx: 4.2, rz: 3.1, h: 1.3 }
];
const hillGeo = new THREE.SphereGeometry(1, 32, 16);
for (const h of hills) {
const m = new THREE.Mesh(hillGeo, hillMat);
m.position.set(h.x, 0, h.z);
m.scale.set(h.rx, h.h, h.rz);
scene.add(m);
}
function groundHeight(x, z) {
let height = 0;
for (const h of hills) {
const dx = (x - h.x) / h.rx, dz = (z - h.z) / h.rz;
const q = 1 - dx * dx - dz * dz;
if (q > 0) height = Math.max(height, h.h * Math.sqrt(q));
}
return height;
}
// Solid obstacles: rocks and scrap barriers, each with a collision radius.
const obstacles = [];
const rockMat = mat(0x77796f, { roughness: 1 });
const scrapMat = mat(0xb86439, { metalness: .45, roughness: .75 });
const stripeMat = mat(0xe5ba63);
const rockGeo = new THREE.DodecahedronGeometry(1, 0);
function rock(x, z, r) {
const mesh = new THREE.Mesh(rockGeo, rockMat);
mesh.position.set(x, r * .48, z);
mesh.scale.set(r, r * .7, r * .85);
mesh.rotation.set(.2, rand() * 3, .15);
scene.add(mesh);
obstacles.push({ x, z, r: r * .85 });
}
function barrier(x, z, angle) {
const g = new THREE.Group();
g.position.set(x, 0, z);
g.rotation.y = angle;
scene.add(g);
box(g, scrapMat, 0, .48, 0, 2.8, .8, .8);
box(g, stripeMat, 0, .91, 0, 2.9, .12, .85);
box(g, darkMat, -.95, .25, 0, .16, .5, .85);
box(g, darkMat, .95, .25, 0, .16, .5, .85);
obstacles.push({ x, z, r: 1.35 });
}
rock(-4, -17, 1.35);
rock(6, 16, 1.4);
rock(-22, 1, 1.25);
rock(21, -4, 1.3);
rock(2, -3, 1.05);
barrier(-4, 9, .5);
barrier(8, -9, -.6);
barrier(-20, -20, .8);
barrier(20, 20, -.4);
// Small non-solid scattered debris.
for (let i = 0; i < 65; i++) {
const a = rand() * Math.PI * 2, r = 5 + rand() * 27;
const x = Math.sin(a) * r, z = Math.cos(a) * r;
const y = groundHeight(x, z) + .04;
box(scene, i % 3 ? concreteMat : scrapMat, x, y, z,
.15 + rand() * .4, .07, .2 + rand() * .5, rand() * Math.PI);
}
function polygon(points, material) {
const geometry = new THREE.BufferGeometry();
geometry.setAttribute("position", new THREE.Float32BufferAttribute(points.flat(), 3));
geometry.computeVertexNormals();
return new THREE.Mesh(geometry, material);
}
const wheelGeo = new THREE.CylinderGeometry(.53, .53, .42, 14);
const hubGeo = new THREE.CylinderGeometry(.26, .26, .44, 12);
const shadowMat = new THREE.MeshBasicMaterial({
color: 0x14100d, transparent: true, opacity: .35, depthWrite: false
});
function makeTruck(colorHex, x, z, angle, aiIndex) {
const group = new THREE.Group();
scene.add(group);
const bodyMat = mat(colorHex, { metalness: .72, roughness: .34, emissive: 0x000000 });
// Wedge body: nose is local +Z.
const v = [
[-.72,.48,-1.32], [.72,.48,-1.32],
[-.72,.48,1.32], [.72,.48,1.32],
[-.72,1.02,-1.2], [.72,1.02,-1.2],
[-.62,1.6,-.38], [.62,1.6,-.38],
[-.62,1.37,.45], [.62,1.37,.45],
[-.72,.91,1.27], [.72,.91,1.27]
];
const faces = [
0,4,5, 0,5,1, 2,3,11, 2,11,10,
0,2,10, 0,10,4, 4,10,8, 4,8,6,
1,5,11, 1,11,3, 5,7,9, 5,9,11,
4,6,7, 4,7,5, 6,8,9, 6,9,7,
8,10,11, 8,11,9, 0,1,3, 0,3,2
];
const bodyGeometry = new THREE.BufferGeometry();
bodyGeometry.setAttribute("position", new THREE.Float32BufferAttribute(v.flat(), 3));
bodyGeometry.setIndex(faces);
bodyGeometry.computeVertexNormals();
const body = new THREE.Mesh(bodyGeometry, bodyMat);
body.material.side = THREE.DoubleSide;
group.add(body);
// Dark side windows make the angular silhouette readable.
const windowMaterial = glassMat.clone();
windowMaterial.side = THREE.DoubleSide;
for (const s of [-1, 1]) {
group.add(polygon([
[s*.635,1.48,-.31], [s*.635,1.30,.36], [s*.70,1.07,.86],
[s*.635,1.48,-.31], [s*.70,1.07,.86], [s*.70,1.08,-.83]
], windowMaterial));
}
box(group, darkMat, 0, .48, 1.34, 1.5, .22, .18);
box(group, lampMat, 0, .88, 1.335, 1.32, .09, .04);
const tailMat = new THREE.MeshBasicMaterial({ color: 0xff594a });
box(group, tailMat, 0, .91, -1.325, 1.25, .08, .04);
const wheels = [];
for (const sx of [-1, 1]) {
for (const sz of [-1, 1]) {
const pivot = new THREE.Group();
pivot.position.set(sx * .87, .48, sz * .91);
group.add(pivot);
const tire = new THREE.Mesh(wheelGeo, tireMat);
tire.rotation.z = Math.PI / 2;
pivot.add(tire);
const hub = new THREE.Mesh(hubGeo, hubMat);
hub.rotation.z = Math.PI / 2;
pivot.add(hub);
wheels.push(pivot);
}
}
const shadow = new THREE.Mesh(new THREE.CircleGeometry(1, 24), shadowMat);
shadow.rotation.x = -Math.PI / 2;
shadow.scale.set(1.45, 2.05, 1);
scene.add(shadow);
return {
group, bodyMat, wheels, shadow, x, z, angle, vx: 0, vz: 0,
radius: 1.3, aiIndex, flash: 0
};
}
const starts = [
[0, 22, Math.PI],
[-17, -3, .8],
[16, -4, -.8],
[-9, -22, .2],
[10, -22, -.2]
];
const colors = [0xc7d1d1, 0xe27640, 0x4f94ac, 0xe0b449, 0xa16491];
const trucks = starts.map((s, i) => makeTruck(colors[i], s[0], s[1], s[2], i - 1));
const player = trucks[0];
const keys = Object.create(null);
const pairCooldown = Array.from({ length: 5 }, () => Array(5).fill(0));
let gameTime = 0;
let impactTime = 0;
let accumulator = 0;
let last = performance.now();
let cameraReady = false;
function wrapAngle(a) {
return Math.atan2(Math.sin(a), Math.cos(a));
}
function updateHUD() {
scoreEl.textContent = Math.floor(state.score).toLocaleString("en-US");
const seconds = Math.max(0, Math.ceil(state.time));
clockEl.textContent = String(Math.floor(seconds / 60)).padStart(2, "0") + ":" +
String(seconds % 60).padStart(2, "0");
}
function resetGame() {
state.time = isDemo ? 20 : 90;
state.score = isDemo ? 5000 : 0;
state.over = false;
state.photo = false;
gameTime = 0;
impactTime = 0;
accumulator = 0;
cameraReady = false;
for (const key in keys) delete keys[key];
trucks.forEach((t, i) => {
t.x = starts[i][0]; t.z = starts[i][1]; t.angle = starts[i][2];
t.vx = 0; t.vz = 0; t.flash = 0;
t.bodyMat.emissive.setHex(0x000000);
});
for (const row of pairCooldown) row.fill(0);
photoEl.classList.remove("visible");
finishEl.classList.remove("visible");
impactEl.style.opacity = "0";
last = performance.now();
updateHUD();
}
function aiControls(t) {
const i = t.aiIndex;
// Individual orbit radii, phases and speeds keep rivals pursuing different
// points. They periodically aim near the player to create encounters.
const phase = gameTime * (.22 + i * .025) + i * Math.PI / 2;
const radius = 10 + i * 2.2;
let tx = Math.sin(phase) * radius;
let tz = Math.cos(phase) * radius;
if (Math.sin(gameTime * .21 + i * 2.1) > .48) {
tx = player.x + Math.sin(phase * 1.7 + i) * 4;
tz = player.z + Math.cos(phase * 1.7 + i) * 4;
}
let dx = tx - t.x, dz = tz - t.z;
const len = Math.hypot(dx, dz) || 1;
dx /= len; dz /= len;
// Local avoidance is strongest at short range; collision physics still applies.
for (const other of trucks) {
if (other === t) continue;
const ox = t.x - other.x, oz = t.z - other.z;
const d = Math.hypot(ox, oz) || .01;
if (d < 5.5) {
const weight = (5.5 - d) / 5.5 * (other === player ? .45 : 1.5);
dx += ox / d * weight;
dz += oz / d * weight;
}
}
for (const o of obstacles) {
const ox = t.x - o.x, oz = t.z - o.z;
const d = Math.hypot(ox, oz) || .01;
if (d < o.r + 4) {
const weight = (o.r + 4 - d) / (o.r + 4) * 1.4;
dx += ox / d * weight;
dz += oz / d * weight;
}
}
const target = Math.atan2(dx, dz);
const difference = wrapAngle(target - t.angle);
return { throttle: 1, steer: THREE.MathUtils.clamp(difference * 1.6, -1, 1) };
}
function moveTruck(t, dt) {
let throttle, steer;
if (t === player) {
throttle = (keys["w"] || keys["arrowup"] ? 1 : 0) -
(keys["s"] || keys["arrowdown"] ? 1 : 0);
steer = (keys["d"] || keys["arrowright"] ? 1 : 0) -
(keys["a"] || keys["arrowleft"] ? 1 : 0);
} else {
const controls = aiControls(t);
throttle = controls.throttle;
steer = controls.steer;
}
const fx = Math.sin(t.angle), fz = Math.cos(t.angle);
const forwardSpeed = t.vx * fx + t.vz * fz;
const turnFactor = Math.min(1, .25 + Math.abs(forwardSpeed) / 5);
const reverse = forwardSpeed < -1 ? -1 : 1;
t.angle += steer * 1.9 * turnFactor * reverse * dt;
const nx = Math.sin(t.angle), nz = Math.cos(t.angle);
t.vx += nx * throttle * 13 * dt;
t.vz += nz * throttle * 13 * dt;
// Reduce sideways sliding without erasing collision impulses immediately.
const sideways = t.vx * nz - t.vz * nx;
t.vx -= sideways * nz * Math.min(1, 2.2 * dt);
t.vz += sideways * nx * Math.min(1, 2.2 * dt);
const drag = Math.exp(-.75 * dt);
t.vx *= drag; t.vz *= drag;
const speed = Math.hypot(t.vx, t.vz);
const maxSpeed = t === player ? 16 : 13.5;
if (speed > maxSpeed) {
t.vx *= maxSpeed / speed;
t.vz *= maxSpeed / speed;
}
t.x += t.vx * dt;
t.z += t.vz * dt;
const distance = Math.hypot(t.x, t.z);
const limit = 33.4;
if (distance > limit) {
const wx = t.x / distance, wz = t.z / distance;
t.x = wx * limit; t.z = wz * limit;
const outward = t.vx * wx + t.vz * wz;
if (outward > 0) {
t.vx -= 1.5 * outward * wx;
t.vz -= 1.5 * outward * wz;
}
}
for (const o of obstacles) {
let dx = t.x - o.x, dz = t.z - o.z;
let d = Math.hypot(dx, dz);
const min = t.radius + o.r;
if (d < min) {
if (d < .001) { dx = 1; dz = 0; d = 1; }
const ox = dx / d, oz = dz / d;
t.x += ox * (min - d);
t.z += oz * (min - d);
const toward = t.vx * ox + t.vz * oz;
if (toward < 0) {
t.vx -= 1.45 * toward * ox;
t.vz -= 1.45 * toward * oz;
if (toward < -3) t.flash = .14;
}
}
}
}
function collideTrucks(a, b, i, j) {
let dx = b.x - a.x, dz = b.z - a.z;
let d = Math.hypot(dx, dz);
const min = a.radius + b.radius;
if (d >= min) return;
if (d < .001) { dx = 1; dz = 0; d = 1; }
const nx = dx / d, nz = dz / d;
const overlap = min - d;
a.x -= nx * overlap * .5; a.z -= nz * overlap * .5;
b.x += nx * overlap * .5; b.z += nz * overlap * .5;
const relative = (b.vx - a.vx) * nx + (b.vz - a.vz) * nz;
if (relative < 0) {
// Equal masses, restitution .55.
const impulse = -(1 + .55) * relative / 2;
a.vx -= impulse * nx; a.vz -= impulse * nz;
b.vx += impulse * nx; b.vz += impulse * nz;
if (relative < -2) {
a.flash = .24; b.flash = .24;
if ((i === 0 || j === 0) && pairCooldown[i][j] <= 0) {
const points = Math.round(-relative * 25 / 10) * 10 + 100;
state.score += points;
impactEl.textContent = "RAM! +" + points;
impactTime = 1;
pairCooldown[i][j] = .75;
}
}
}
}
function syncTruck(t, dt) {
const y = groundHeight(t.x, t.z);
t.group.position.set(t.x, y, t.z);
t.group.rotation.y = t.angle;
const speed = Math.hypot(t.vx, t.vz);
for (const wheel of t.wheels) wheel.rotation.x += speed * dt * 1.8;
t.shadow.position.set(t.x, y + .035, t.z);
t.shadow.rotation.z = -t.angle;
t.flash = Math.max(0, t.flash - dt);
t.bodyMat.emissive.setHex(t.flash > 0 ? 0x995022 : 0x000000);
}
function step(dt) {
state.time = Math.max(0, state.time - dt);
gameTime += dt;
for (let i = 0; i < 5; i++) {
for (let j = i + 1; j < 5; j++) {
pairCooldown[i][j] = Math.max(0, pairCooldown[i][j] - dt);
}
}
for (const t of trucks) moveTruck(t, dt);
for (let i = 0; i < 5; i++) {
for (let j = i + 1; j < 5; j++) collideTrucks(trucks[i], trucks[j], i, j);
}
for (const t of trucks) syncTruck(t, dt);
impactTime = Math.max(0, impactTime - dt);
impactEl.style.opacity = String(Math.min(1, impactTime * 3));
if (state.time <= 0) {
state.over = true;
document.getElementById("finalScore").textContent =
Math.floor(state.score).toLocaleString("en-US");
finishEl.classList.add("visible");
}
updateHUD();
}
function updateCamera(dt) {
const fx = Math.sin(player.angle), fz = Math.cos(player.angle);
const y = groundHeight(player.x, player.z);
const desired = new THREE.Vector3(player.x - fx * 11, y + 8, player.z - fz * 11);
if (!cameraReady) {
camera.position.copy(desired);
cameraReady = true;
} else {
camera.position.lerp(desired, 1 - Math.exp(-3 * dt));
}
camera.lookAt(player.x + fx * 3, y + 1, player.z + fz * 3);
}
document.addEventListener("keydown", event => {
const key = event.key.toLowerCase();
if (["arrowup", "arrowdown", "arrowleft", "arrowright", " "].includes(key)) {
event.preventDefault();
}
if (key === "p" && !event.repeat) {
state.photo = !state.photo;
photoEl.classList.toggle("visible", state.photo);
document.getElementById("photoScore").textContent =
Math.floor(state.score).toLocaleString("en-US");
accumulator = 0;
last = performance.now();
return;
}
if (key === "r" && state.over && !state.photo && !event.repeat) {
resetGame();
return;
}
keys[key] = true;
});
document.addEventListener("keyup", event => {
keys[event.key.toLowerCase()] = false;
});
window.addEventListener("blur", () => {
for (const key in keys) keys[key] = false;
});
window.addEventListener("resize", () => {
camera.aspect = window.innerWidth / window.innerHeight;
camera.updateProjectionMatrix();
renderer.setSize(window.innerWidth, window.innerHeight);
});
// Initialize the visible positions before the first simulation step.
for (const t of trucks) syncTruck(t, 0);
updateCamera(0);
updateHUD();
function frame(now) {
requestAnimationFrame(frame);
const elapsed = Math.min((now - last) / 1000, .1);
last = now;
if (!state.photo && !state.over) {
accumulator += elapsed;
const fixedStep = 1 / 60;
while (accumulator >= fixedStep && !state.over) {
step(fixedStep);
accumulator -= fixedStep;
}
updateCamera(elapsed);
} else {
accumulator = 0;
}
// Rendering continues in photo mode, but neither simulation nor camera moves.
renderer.render(scene, camera);
}
requestAnimationFrame(frame);
})();
</script>
</body>
</html>
The notes
- Five trucks: The array contains one player and four AI rivals. Each rival follows a different moving waypoint, periodically targets the player, and steers away from nearby rivals and obstacles.
- Demo mode:
const state = { time: isDemo ? 20 : 90, score: isDemo ? 5000 : 0, photo: false, over: false };initializes the actual clock and score used by the simulation and HUD. - Photo mode:
Pstops the physics steps, clock, and camera updates. The render loop continues drawing the frozen scene beneath the card. - Collisions: Trucks use circular footprints: overlaps are separated, then approaching pairs receive an equal-mass impulse with restitution. Solid obstacles and the arena boundary push trucks out and reflect the inward velocity component. Player–rival impacts above a speed threshold award points, with a per-pair cooldown.
Attachments
openai/gpt-6.1-terra-pro — page