Run Detail
completedgpt-6.1-terraRecorded for these videos
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Provider
openrouter
Challenge Version
v1.0
Turns
1
Duration
102.0s
Total Tokens
9,897
Input Tokens
719
Output Tokens
9,178
Reasoning Tokens
1,269
Reasoning Effort
default
Est. Cost
$0.0466
Started
10/26/2026, 6:38:19 PM
OR Provider
OpenAI
Finish Reason
stop
Generation ID
gen-1793039899-hmSk4rnppLbUR3RUkk2K
Turns (1)
Turn #1
719 in9,178 out1,269 reasoning9,897 total102.0s
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 Volt Rally packs five angular monster trucks into a neon-lit stadium full of fans, dirt mounds, and smashable-looking debris.
The game
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="icon" href="data:,">
<title>Iron Volt Rally</title>
<style>
* { box-sizing: border-box; }
html, body { margin: 0; width: 100%; height: 100%; overflow: hidden; }
body {
background: #0b111b;
color: #fff;
font-family: system-ui, sans-serif;
}
canvas { display: block; width: 100%; height: 100%; }
#hud {
position: fixed;
top: 16px;
left: 16px;
right: 16px;
display: flex;
align-items: flex-start;
justify-content: space-between;
gap: 12px;
pointer-events: none;
text-shadow: 0 2px 8px #000;
}
.panel {
background: rgba(8, 15, 25, .83);
border: 1px solid rgba(164, 229, 255, .35);
border-radius: 8px;
padding: 10px 14px;
box-shadow: 0 4px 20px #0007;
}
.name { font-weight: 900; letter-spacing: .08em; font-size: 17px; }
.sub { color: #b8cbd6; font-size: 12px; margin-top: 4px; }
.numbers { display: flex; gap: 22px; text-align: right; }
.label { color: #9eb4c2; font-size: 10px; letter-spacing: .13em; }
.value { font-size: 24px; font-weight: 900; font-variant-numeric: tabular-nums; }
#score { color: #ffe47a; }
#hit {
position: fixed;
top: 90px;
left: 50%;
transform: translateX(-50%);
color: #ffe47a;
font-weight: 900;
font-size: 25px;
text-shadow: 0 2px 8px #000;
pointer-events: none;
opacity: 0;
}
#overlay {
position: fixed;
inset: 0;
display: none;
place-items: center;
background: rgba(3, 8, 15, .66);
text-align: center;
pointer-events: none;
}
#overlay.visible { display: grid; }
#card {
border: 1px solid #8ddcff;
background: rgba(8, 16, 26, .92);
padding: 28px 45px;
border-radius: 10px;
box-shadow: 0 12px 60px #000a;
}
#card .eyebrow { color: #83dfff; font-size: 12px; letter-spacing: .25em; }
#card h1 { margin: 12px 0 5px; font-size: clamp(24px, 5vw, 44px); }
#card .big { color: #ffe47a; font-size: 30px; font-weight: 900; }
#card .hint { color: #bccbd3; margin-top: 16px; font-size: 13px; }
#error {
position: fixed;
inset: 0;
display: grid;
place-items: center;
padding: 24px;
text-align: center;
color: #d3e3ec;
}
@media (max-width: 550px) {
#hud { top: 8px; left: 8px; right: 8px; }
.panel { padding: 8px; }
.name { font-size: 13px; }
.sub { font-size: 10px; }
.numbers { gap: 10px; }
.value { font-size: 19px; }
}
</style>
</head>
<body>
<div id="error">Loading the arena…<br>Three.js requires a network connection.</div>
<div id="hud">
<div class="panel">
<div class="name">IRON VOLT ARENA</div>
<div class="sub">WASD / arrows: drive · P: photo</div>
</div>
<div class="panel numbers">
<div><div class="label">SCORE</div><div class="value" id="score">0</div></div>
<div><div class="label">TIME</div><div class="value" id="clock">1:30</div></div>
</div>
</div>
<div id="hit"></div>
<div id="overlay">
<div id="card">
<div class="eyebrow" id="cardType">PHOTO MODE</div>
<h1>IRON VOLT ARENA</h1>
<div class="big" id="cardScore">0 POINTS</div>
<div class="hint" id="cardHint">Press P to resume</div>
</div>
</div>
<!-- The page's only external request. -->
<script src="https://cdn.jsdelivr.net/npm/three@0.160.1/build/three.min.js"></script>
<script>
(() => {
"use strict";
if (!window.THREE) {
document.getElementById("error").textContent =
"The arena could not load. Please connect to the internet and reload.";
return;
}
document.getElementById("error").style.display = "none";
const arenaName = "IRON VOLT ARENA";
const demo = location.hash === "#demo";
let score = demo ? 5000 : 0;
let timeLeft = demo ? 20 : 90;
let photo = false;
let finished = false;
let accumulator = 0;
let lastFrame = 0;
let hitTimer = 0;
const step = 1 / 60;
const keys = Object.create(null);
const scoreEl = document.getElementById("score");
const clockEl = document.getElementById("clock");
const hitEl = document.getElementById("hit");
const overlay = document.getElementById("overlay");
const scene = new THREE.Scene();
scene.background = new THREE.Color(0x101a28);
scene.fog = new THREE.Fog(0x101a28, 125, 230);
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;
document.body.insertBefore(renderer.domElement, document.body.firstChild);
const camera = new THREE.PerspectiveCamera(
48, window.innerWidth / window.innerHeight, 0.1, 300
);
camera.position.set(0, 77, 82);
camera.lookAt(0, 0, 0);
scene.add(new THREE.HemisphereLight(0xbfe6ff, 0x59432f, 2.0));
const sun = new THREE.DirectionalLight(0xffe7c3, 2.3);
sun.position.set(-30, 70, 25);
scene.add(sun);
const mat = (color, extra = {}) =>
new THREE.MeshStandardMaterial({ color, roughness: 0.8, ...extra });
const dirtMat = mat(0x795843);
const wallMat = mat(0x344655);
const standMat = mat(0x26323d);
const yellowMat = mat(0xffc44d, { emissive: 0x4c2500 });
const darkMat = mat(0x121921);
const tireMat = mat(0x191b1d);
const hubMat = mat(0x8798a5, { metalness: 0.65, roughness: 0.35 });
const glassMat = mat(0x172e3e, { metalness: 0.5, roughness: 0.25 });
const lightMat = mat(0xb7f5ff, { emissive: 0x55dfff, emissiveIntensity: 1.7 });
const redLightMat = mat(0xff5043, { emissive: 0xc51c12, emissiveIntensity: 1.2 });
function box(w, h, d, material, x, y, z, parent = scene) {
const mesh = new THREE.Mesh(new THREE.BoxGeometry(w, h, d), material);
mesh.position.set(x, y, z);
parent.add(mesh);
return mesh;
}
// Arena floor and retaining walls.
box(100, 1, 70, dirtMat, 0, -0.6, 0);
box(102, 2.2, 1.2, wallMat, 0, 1, -35.5);
box(102, 2.2, 1.2, wallMat, 0, 1, 35.5);
box(1.2, 2.2, 70, wallMat, -50.5, 1, 0);
box(1.2, 2.2, 70, wallMat, 50.5, 1, 0);
box(102, 0.18, 0.2, yellowMat, 0, 2.15, -35.5);
box(102, 0.18, 0.2, yellowMat, 0, 2.15, 35.5);
box(0.2, 0.18, 70, yellowMat, -50.5, 2.15, 0);
box(0.2, 0.18, 70, yellowMat, 50.5, 2.15, 0);
// Tiered stands on all four sides.
for (let t = 0; t < 5; t++) {
const y = 0.35 + t * 0.9;
for (const s of [-1, 1]) {
box(120, 0.7 + t * 1.8, 2.7, standMat, 0, y, s * (37.5 + t * 2.5));
box(2.7, 0.7 + t * 1.8, 75, standMat, s * (52.5 + t * 2.5), y, 0);
}
}
// Deterministic procedural spectators: separate heads and colorful bodies.
let seed = 93847;
function random() {
seed = (seed * 1664525 + 1013904223) >>> 0;
return seed / 4294967296;
}
const fans = [];
for (let t = 0; t < 5; t++) {
const y = 1.15 + t * 1.8;
for (const s of [-1, 1]) {
for (let x = -57; x <= 57; x += 1.65) {
fans.push([x + (random() - .5) * .35, y, s * (37.5 + t * 2.5)]);
}
for (let z = -34; z <= 34; z += 1.65) {
fans.push([s * (52.5 + t * 2.5), y, z + (random() - .5) * .35]);
}
}
}
const bodyFans = new THREE.InstancedMesh(
new THREE.BoxGeometry(.68, .9, .45), mat(0xffffff), fans.length
);
const headFans = new THREE.InstancedMesh(
new THREE.SphereGeometry(.27, 6, 4), mat(0xffffff), fans.length
);
const dummy = new THREE.Object3D();
const fanColors = [0xf2b43c, 0xe55c4b, 0x4caec9, 0xe0e3d8, 0x637bd0, 0x76ae6b];
const skinColors = [0xf0c6a0, 0xc78e68, 0x8e5b43, 0xefd5bd];
fans.forEach((p, i) => {
dummy.position.set(p[0], p[1] + .45, p[2]);
dummy.rotation.y = random() * .5;
dummy.scale.setScalar(.85 + random() * .3);
dummy.updateMatrix();
bodyFans.setMatrixAt(i, dummy.matrix);
bodyFans.setColorAt(i, new THREE.Color(fanColors[Math.floor(random() * fanColors.length)]));
dummy.position.y = p[1] + 1.1;
dummy.updateMatrix();
headFans.setMatrixAt(i, dummy.matrix);
headFans.setColorAt(i, new THREE.Color(skinColors[Math.floor(random() * skinColors.length)]));
});
scene.add(bodyFans, headFans);
// Floodlights.
for (const x of [-58, 58]) {
for (const z of [-42, 42]) {
box(.5, 18, .5, wallMat, x, 9, z);
box(5, 1, 1, darkMat, x, 18, z);
for (let j = -1; j <= 1; j++) {
box(1, .55, .3, lightMat, x + j * 1.45, 18, z - Math.sign(z) * .6);
}
}
}
// Dirt hills use the same surface equation for drawing and truck height.
const hills = [
{ x: -25, z: -14, r: 9, h: 3.1 },
{ x: 23, z: 12, r: 8, h: 2.7 },
{ x: 1, z: -23, r: 6, h: 2.0 }
];
const hillGeo = new THREE.SphereGeometry(1, 24, 14);
hills.forEach(h => {
const mesh = new THREE.Mesh(hillGeo, mat(0x8b6549));
mesh.position.set(h.x, -h.h * .45, h.z);
mesh.scale.set(h.r, h.h * 1.45, h.r);
scene.add(mesh);
});
function groundHeight(x, z) {
let height = 0;
for (const h of hills) {
const d2 = ((x - h.x) ** 2 + (z - h.z) ** 2) / (h.r * h.r);
if (d2 < 1) {
height = Math.max(height, -h.h * .45 + h.h * 1.45 * Math.sqrt(1 - d2));
}
}
return height;
}
// Three physical obstacle types: tire stacks, concrete barriers, barrels.
const obstacles = [];
function addObstacle(x, z, r, type) {
obstacles.push({ x, z, r });
const y = groundHeight(x, z);
if (type === "tires") {
for (let i = 0; i < 3; i++) {
const tire = new THREE.Mesh(new THREE.CylinderGeometry(1.25, 1.25, .55, 12), tireMat);
tire.position.set(x + (i === 2 ? .18 : 0), y + .3 + i * .55, z);
scene.add(tire);
const hole = new THREE.Mesh(new THREE.CylinderGeometry(.5, .5, .57, 12), darkMat);
hole.position.copy(tire.position);
scene.add(hole);
}
} else if (type === "barrier") {
box(3.5, 1.4, 1.5, mat(0x93958d), x, y + .7, z);
box(3.4, .18, .08, yellowMat, x, y + .95, z + .78);
} else {
const barrel = new THREE.Mesh(new THREE.CylinderGeometry(.8, .8, 1.8, 12), mat(0xd75b2b));
barrel.position.set(x, y + .9, z);
scene.add(barrel);
for (const dy of [.4, 1.4]) {
const band = new THREE.Mesh(new THREE.CylinderGeometry(.83, .83, .12, 12), hubMat);
band.position.set(x, y + dy, z);
scene.add(band);
}
}
}
addObstacle(-37, 8, 1.35, "tires");
addObstacle(-11, -6, 1.35, "tires");
addObstacle(35, -19, 1.35, "tires");
addObstacle(12, -8, 1.9, "barrier");
addObstacle(-27, 23, 1.9, "barrier");
addObstacle(36, 22, 1.9, "barrier");
addObstacle(2, 6, .9, "barrel");
addObstacle(-40, -23, .9, "barrel");
addObstacle(29, -3, .9, "barrel");
// Faceted Cybertruck-inspired body, with its nose pointing along local +Z.
function bodyGeometry() {
const p = [
[-1.65, 1.45, -2.5], [1.65, 1.45, -2.5],
[-1.65, 1.45, 2.5], [1.65, 1.45, 2.5],
[-1.55, 2.25, -2.3], [1.55, 2.25, -2.3],
[-1.42, 3.15, -.35], [1.42, 3.15, -.35],
[-1.55, 2.12, 2.25], [1.55, 2.12, 2.25]
];
const faces = [
0,2,1, 1,2,3, 0,4,2, 2,4,6, 2,6,8,
1,3,5, 3,9,7, 3,7,5, 4,5,6, 5,7,6,
6,7,8, 7,9,8, 2,8,3, 3,8,9, 0,1,4, 1,5,4
];
const positions = [];
for (const index of faces) positions.push(...p[index]);
const geometry = new THREE.BufferGeometry();
geometry.setAttribute("position", new THREE.Float32BufferAttribute(positions, 3));
geometry.computeVertexNormals();
return geometry;
}
const truckBodyGeo = bodyGeometry();
const wheelGeo = new THREE.CylinderGeometry(1.08, 1.08, .85, 14);
const hubGeo = new THREE.CylinderGeometry(.5, .5, .88, 12);
const trucks = [];
const colors = [0xc8d7df, 0xeb5949, 0x54b9d0, 0xe5b849, 0x9b7bd2];
const starts = [
[0, 20, Math.PI],
[-32, -4, 1.1],
[30, -17, -1.1],
[-17, 15, 2.3],
[25, 20, -2.2]
];
function makeTruck(i) {
const group = new THREE.Group();
scene.add(group);
const paint = mat(colors[i], { metalness: .65, roughness: .35 });
const body = new THREE.Mesh(truckBodyGeo, paint);
group.add(body);
box(3.05, .15, 1.45, glassMat, 0, 2.67, .93, group).rotation.x = -.45;
box(3.05, .1, 1.25, glassMat, 0, 2.73, -1.3, group).rotation.x = .43;
box(3.15, .13, .12, lightMat, 0, 2.02, 2.53, group);
box(3.15, .12, .12, redLightMat, 0, 2.03, -2.53, group);
box(3.7, .35, .35, darkMat, 0, 1.1, 2.65, group);
box(3.7, .35, .35, darkMat, 0, 1.1, -2.65, group);
const wheels = [];
for (const x of [-1.85, 1.85]) {
for (const z of [-1.7, 1.7]) {
const wheel = new THREE.Mesh(wheelGeo, tireMat);
wheel.rotation.z = Math.PI / 2;
wheel.position.set(x, 1.05, z);
group.add(wheel);
const hub = new THREE.Mesh(hubGeo, hubMat);
hub.rotation.z = Math.PI / 2;
wheel.add(hub);
// Child geometry uses the wheel's unrotated local axis.
hub.rotation.z = 0;
wheels.push(wheel);
}
}
if (i === 0) {
const ring = new THREE.Mesh(
new THREE.RingGeometry(3.1, 3.3, 32),
new THREE.MeshBasicMaterial({ color: 0x75e8ff, side: THREE.DoubleSide })
);
ring.rotation.x = -Math.PI / 2;
ring.position.y = .08;
group.add(ring);
}
const [x, z, angle] = starts[i];
const truck = {
i, group, paint, wheels, x, z, angle, vx: 0, vz: 0,
radius: 2.45, cooldown: 0, flash: 0,
targetX: x, targetZ: z, targetTimer: .2 + i * .7
};
trucks.push(truck);
return truck;
}
for (let i = 0; i < 5; i++) makeTruck(i);
const player = trucks[0];
const clamp = (n, a, b) => Math.max(a, Math.min(b, n));
function angleDiff(a, b) {
return Math.atan2(Math.sin(a - b), Math.cos(a - b));
}
function aiControls(t, dt) {
t.targetTimer -= dt;
if (t.targetTimer <= 0) {
t.targetTimer = 2.5 + random() * 2.5;
if (random() < .48) {
// Offset approach points keep simultaneous attackers in separate lanes.
const side = (t.i - 2.5) * 5;
t.targetX = clamp(player.x + Math.cos(player.angle) * side, -43, 43);
t.targetZ = clamp(player.z - Math.sin(player.angle) * side, -28, 28);
} else {
t.targetX = -40 + random() * 80;
t.targetZ = -26 + random() * 52;
}
}
let dx = t.targetX - t.x;
let dz = t.targetZ - t.z;
const targetLength = Math.hypot(dx, dz) || 1;
dx /= targetLength;
dz /= targetLength;
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 < 10) {
const weight = (10 - d) / 10 * 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 + 7) {
const weight = (o.r + 7 - d) / 7 * 1.3;
dx += ox / d * weight;
dz += oz / d * weight;
}
}
const desired = Math.atan2(dx, dz);
const turn = clamp(angleDiff(desired, t.angle) * 1.4, -1, 1);
return { throttle: 1, turn };
}
function simulate(dt) {
timeLeft = Math.max(0, timeLeft - dt);
if (timeLeft === 0) {
finished = true;
showCard();
return;
}
if (hitTimer > 0) {
hitTimer -= dt;
hitEl.style.opacity = Math.min(1, hitTimer * 2);
}
for (const t of trucks) {
t.cooldown = Math.max(0, t.cooldown - dt);
t.flash = Math.max(0, t.flash - dt);
t.paint.emissive.setHex(t.flash > 0 ? 0x773000 : 0x000000);
let controls;
if (t === player) {
controls = {
throttle: (keys.KeyW || keys.ArrowUp ? 1 : 0) -
(keys.KeyS || keys.ArrowDown ? 1 : 0),
turn: (keys.KeyD || keys.ArrowRight ? 1 : 0) -
(keys.KeyA || keys.ArrowLeft ? 1 : 0)
};
} else {
controls = aiControls(t, dt);
}
let fx = Math.sin(t.angle), fz = Math.cos(t.angle);
let forward = t.vx * fx + t.vz * fz;
const steerStrength = clamp(Math.abs(forward) / 4, .2, 1);
const reverse = forward < -1 ? -1 : 1;
t.angle += controls.turn * 1.65 * steerStrength * reverse * dt;
fx = Math.sin(t.angle);
fz = Math.cos(t.angle);
t.vx += fx * controls.throttle * 18 * dt;
t.vz += fz * controls.throttle * 18 * dt;
// Tire grip damps sideways velocity while preserving collision impulses.
forward = t.vx * fx + t.vz * fz;
const lateralX = t.vx - forward * fx;
const lateralZ = t.vz - forward * fz;
t.vx -= lateralX * Math.min(1, 3.3 * dt);
t.vz -= lateralZ * Math.min(1, 3.3 * dt);
const drag = Math.max(0, 1 - (controls.throttle ? .35 : 1.0) * dt);
t.vx *= drag;
t.vz *= drag;
const speed = Math.hypot(t.vx, t.vz);
const maxSpeed = t === player ? 20 : 16;
if (speed > maxSpeed) {
t.vx *= maxSpeed / speed;
t.vz *= maxSpeed / speed;
}
t.x += t.vx * dt;
t.z += t.vz * dt;
// Circular obstacles: depenetrate and reflect the inward normal velocity.
for (const o of obstacles) {
let dx = t.x - o.x, dz = t.z - o.z;
let d = Math.hypot(dx, dz);
const minD = t.radius + o.r;
if (d < minD) {
if (d < .001) { dx = 1; dz = 0; d = 1; }
const nx = dx / d, nz = dz / d;
t.x += nx * (minD - d);
t.z += nz * (minD - d);
const vn = t.vx * nx + t.vz * nz;
if (vn < 0) {
t.vx -= 1.5 * vn * nx;
t.vz -= 1.5 * vn * nz;
t.flash = .18;
}
}
}
// Stadium boundary.
const limitX = 49 - t.radius, limitZ = 34 - t.radius;
if (t.x < -limitX || t.x > limitX) {
t.x = clamp(t.x, -limitX, limitX);
t.vx *= -.5;
t.flash = .12;
}
if (t.z < -limitZ || t.z > limitZ) {
t.z = clamp(t.z, -limitZ, limitZ);
t.vz *= -.5;
t.flash = .12;
}
}
// Equal-mass truck circles exchange a restitution impulse.
for (let i = 0; i < trucks.length; i++) {
for (let j = i + 1; j < trucks.length; j++) {
const a = trucks[i], b = trucks[j];
let dx = b.x - a.x, dz = b.z - a.z;
let d = Math.hypot(dx, dz);
const minD = a.radius + b.radius;
if (d >= minD) continue;
if (d < .001) { dx = 1; dz = 0; d = 1; }
const nx = dx / d, nz = dz / d;
const overlap = (minD - d) * .5;
a.x -= nx * overlap; a.z -= nz * overlap;
b.x += nx * overlap; b.z += nz * overlap;
const relative = (b.vx - a.vx) * nx + (b.vz - a.vz) * nz;
if (relative < 0) {
const impulse = -(1 + .65) * relative / 2;
a.vx -= impulse * nx; a.vz -= impulse * nz;
b.vx += impulse * nx; b.vz += impulse * nz;
a.flash = b.flash = .25;
if (a === player && -relative > 2 && b.cooldown <= 0) {
const points = 250 + Math.round(Math.min(750, -relative * 40) / 50) * 50;
score += points;
b.cooldown = .8;
hitEl.textContent = "RAM! +" + points;
hitTimer = 1.1;
hitEl.style.opacity = "1";
}
}
}
}
for (const t of trucks) {
t.group.position.set(t.x, groundHeight(t.x, t.z), t.z);
t.group.rotation.y = t.angle;
const wheelSpin = Math.hypot(t.vx, t.vz) * dt;
for (const wheel of t.wheels) wheel.rotation.x += wheelSpin;
}
}
function updateHud() {
scoreEl.textContent = score.toLocaleString("en-US");
const seconds = Math.ceil(timeLeft);
clockEl.textContent = Math.floor(seconds / 60) + ":" +
String(seconds % 60).padStart(2, "0");
}
function showCard() {
const visible = photo || finished;
overlay.classList.toggle("visible", visible);
if (!visible) return;
document.querySelector("#card h1").textContent = arenaName;
document.getElementById("cardType").textContent = photo ? "PHOTO MODE" : "RALLY COMPLETE";
document.getElementById("cardScore").textContent = score.toLocaleString("en-US") + " POINTS";
document.getElementById("cardHint").textContent = photo ?
"Press P to resume" : "Press R to race again · P for photo";
}
// Initial placement is applied before the first rendered frame.
for (const t of trucks) {
t.group.position.set(t.x, groundHeight(t.x, t.z), t.z);
t.group.rotation.y = t.angle;
}
updateHud();
window.addEventListener("keydown", e => {
if (["ArrowUp", "ArrowDown", "ArrowLeft", "ArrowRight", "Space"].includes(e.code)) {
e.preventDefault();
}
if (e.code === "KeyP" && !e.repeat) {
photo = !photo;
accumulator = 0;
showCard();
} else if (e.code === "KeyR" && finished && !photo && !e.repeat) {
location.reload();
} else {
keys[e.code] = true;
}
});
window.addEventListener("keyup", e => { keys[e.code] = false; });
window.addEventListener("blur", () => {
for (const key in keys) keys[key] = false;
accumulator = 0;
lastFrame = 0;
});
window.addEventListener("resize", () => {
camera.aspect = window.innerWidth / window.innerHeight;
camera.updateProjectionMatrix();
renderer.setSize(window.innerWidth, window.innerHeight);
});
function frame(now) {
requestAnimationFrame(frame);
const elapsed = lastFrame ? Math.min((now - lastFrame) / 1000, .1) : 0;
lastFrame = now;
if (!photo && !finished) {
accumulator += elapsed;
while (accumulator >= step && !finished) {
simulate(step);
accumulator -= step;
}
} else {
accumulator = 0;
}
updateHud();
// The camera and rendering remain still in photo mode.
if (!photo) {
const targetX = player.x * .22;
const targetZ = player.z * .22;
camera.position.x += (targetX - camera.position.x) * .025;
camera.position.z += ((82 + targetZ) - camera.position.z) * .025;
camera.lookAt(targetX, 0, targetZ);
}
renderer.render(scene, camera);
}
requestAnimationFrame(frame);
})();
</script>
</body>
</html>
The notes
- Five trucks: One player and four rivals are created from five starting positions. Rivals choose independent targets, offset attacks on the player, and steer away from nearby trucks and obstacles.
- Demo mode:
score = demo ? 5000 : 0andtimeLeft = demo ? 20 : 90initialize the actual state used by scoring and the simulation clock, not an overlay. - Photo mode: P stops the fixed-step simulation and camera movement; the render loop continues to draw the frozen scene and card.
- Collisions: Trucks and obstacles use horizontal circles. Overlaps are separated, and inward normal velocity produces a restitution impulse; truck pairs have equal mass. Player impacts above a speed threshold award points, with a per-rival cooldown.
Attachments
openai/gpt-6.1-terra — page