Run Detail
completedbeam-1.0-501b-a23bRecorded for these videos
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Provider
openrouter
Challenge Version
v1.0
Turns
1
Duration
118.2s
Total Tokens
29,361
Input Tokens
761
Output Tokens
28,600
Reasoning Tokens
21,624
Reasoning Effort
default
Est. Cost
$0.0288
Started
10/16/2026, 4:31:12 PM
OR Provider
Nebius
Finish Reason
stop
Generation ID
gen-1792168273-pnV0DyPkyKdt81xymCQJ
Turns (1)
Turn #1
761 in28,600 out21,624 reasoning29,361 total118.2s
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
Thunder Basin Stadium is a compact neon-lit monster-truck rally where five Cybertruck-style rigs brawl across hilly dirt, tire stacks, barriers, and debris while a full 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>Thunder Basin Stadium</title>
<style>
html,body{margin:0;height:100%;overflow:hidden;background:#05070a;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;color:#e8f0ff}
#hud{position:fixed;left:12px;top:12px;z-index:10;background:rgba(0,0,0,.48);padding:8px 12px;border-radius:8px;font-size:14px;line-height:1.45;backdrop-filter:blur(2px)}
#hud .name{font-weight:800;letter-spacing:.08em;color:#7df9ff}
#photo{position:fixed;inset:0;display:none;align-items:center;justify-content:center;flex-direction:column;background:rgba(0,0,0,.76);z-index:20;color:#fff;text-align:center}
#photo.show{display:flex}
#photo h1{font-size:clamp(2rem,8vw,5rem);margin:0;letter-spacing:.12em}
#photo p{font-size:clamp(1rem,3vw,2rem);margin:.6rem 0 0}
canvas{display:block}
</style>
</head>
<body>
<div id="hud">
<div class="name" id="arenaName">THUNDER BASIN STADIUM</div>
<div>Score: <span id="score">0</span></div>
<div>Time: <span id="time">90</span></div>
<div>WASD / Arrows drive · P photo mode</div>
</div>
<div id="photo"><h1 id="photoName"></h1><p>Score: <span id="photoScore"></span></p></div>
<script src="https://cdnjs.cloudflare.com/ajax/libs/three.js/r128/three.min.js"></script>
<script>
const ARENA_NAME = "THUNDER BASIN STADIUM";
const isDemo = (location.hash === '#demo') || (location.href.endsWith('#demo'));
let score = isDemo ? 5000 : 0;
let timeLeft = isDemo ? 20 : 90;
let paused = false;
let running = true;
const keys = {up:false,down:false,left:false,right:false};
window.addEventListener('keydown', (e) => {
const k = e.key.toLowerCase();
if (k === 'p') { togglePhoto(); e.preventDefault(); return; }
if (k === 'arrowup' || k === 'w') keys.up = true;
if (k === 'arrowdown' || k === 's') keys.down = true;
if (k === 'arrowleft' || k === 'a') keys.left = true;
if (k === 'arrowright' || k === 'd') keys.right = true;
if (k.startsWith('arrow')) e.preventDefault();
});
window.addEventListener('keyup', (e) => {
const k = e.key.toLowerCase();
if (k === 'arrowup' || k === 'w') keys.up = false;
if (k === 'arrowdown' || k === 's') keys.down = false;
if (k === 'arrowleft' || k === 'a') keys.left = false;
if (k === 'arrowright' || k === 'd') keys.right = false;
});
function togglePhoto() {
paused = !paused;
const el = document.getElementById('photo');
if (paused) {
el.classList.add('show');
document.getElementById('photoName').textContent = ARENA_NAME;
document.getElementById('photoScore').textContent = score;
} else {
el.classList.remove('show');
}
}
const scene = new THREE.Scene();
scene.background = new THREE.Color(0x0a0f1f);
scene.fog = new THREE.Fog(0x0a0f1f, 45, 130);
const camera = new THREE.PerspectiveCamera(60, window.innerWidth/window.innerHeight, 0.1, 300);
camera.position.set(0, 20, 30);
const renderer = new THREE.WebGLRenderer({antialias:true});
renderer.setSize(window.innerWidth, window.innerHeight);
renderer.shadowMap.enabled = true;
renderer.shadowMap.type = THREE.PCFSoftShadowMap;
document.body.appendChild(renderer.domElement);
renderer.domElement.tabIndex = 0;
renderer.domElement.style.outline = 'none';
renderer.domElement.addEventListener('click', () => renderer.domElement.focus());
const ambient = new THREE.AmbientLight(0xffffff, 0.42);
scene.add(ambient);
const sun = new THREE.DirectionalLight(0xfff0cc, 1.05);
sun.position.set(24, 42, 12);
sun.castShadow = true;
sun.shadow.mapSize.set(1024,1024);
sun.shadow.camera.left = -40; sun.shadow.camera.right = 40;
sun.shadow.camera.top = 40; sun.shadow.camera.bottom = -40;
sun.shadow.camera.near = 1; sun.shadow.camera.far = 120;
scene.add(sun);
function terrainHeight(x,z) {
let h = 0;
h += 1.05*Math.exp(-((x-5)**2+(z+3)**2)/34);
h += 0.82*Math.exp(-((x+7)**2+(z-4)**2)/26);
h += 0.42*Math.sin(x*0.35)*Math.cos(z*0.28);
h += 0.22*Math.sin((x+z)*0.15);
if (h < 0) h = 0;
return h;
}
const groundGeo = new THREE.PlaneGeometry(72, 58, 100, 80);
groundGeo.rotateX(-Math.PI/2);
const gpos = groundGeo.attributes.position;
for (let i=0;i<gpos.count;i++) {
const x = gpos.getX(i);
const z = gpos.getZ(i);
gpos.setY(i, terrainHeight(x,z));
}
groundGeo.computeVertexNormals();
const ground = new THREE.Mesh(groundGeo, new THREE.MeshStandardMaterial({color:0x6a5338, roughness:0.96}));
ground.receiveShadow = true;
scene.add(ground);
for (let tier=0; tier<3; tier++) {
const r = 24 + tier*2.6;
const y = 1.1 + tier*1.05;
for (let i=0;i<22;i++) {
const a = i/22*Math.PI*2;
const x = r*Math.cos(a);
const z = r*0.78*Math.sin(a);
const seg = new THREE.Mesh(new THREE.BoxGeometry(5.2, 1.0, 4.0), new THREE.MeshStandardMaterial({color:0x3b404d, roughness:0.85}));
seg.position.set(x,y,z);
seg.rotation.y = a + Math.PI/2;
seg.castShadow = true;
seg.receiveShadow = true;
scene.add(seg);
}
}
const CROWD = 1800;
const crowdGeo = new THREE.BoxGeometry(0.28, 0.55, 0.28);
const crowdMat = new THREE.MeshStandardMaterial({color:0xffffff, roughness:0.85});
const crowd = new THREE.InstancedMesh(crowdGeo, crowdMat, CROWD);
const dummy = new THREE.Object3D();
for (let i=0;i<CROWD;i++) {
const a = Math.random()*Math.PI*2;
const r = 23 + Math.random()*8;
const x = r*Math.cos(a);
const z = r*0.78*Math.sin(a);
const tier = Math.floor(Math.random()*3);
const y = 1.35 + tier*1.05 + Math.random()*0.15;
dummy.position.set(x,y,z);
dummy.rotation.y = Math.random()*Math.PI*2;
const s = 0.8 + Math.random()*0.45;
dummy.scale.set(s,s,s);
dummy.updateMatrix();
crowd.setMatrixAt(i, dummy.matrix);
crowd.setColorAt(i, new THREE.Color().setHSL(Math.random(), 0.55, 0.45 + Math.random()*0.25));
}
crowd.instanceMatrix.needsUpdate = true;
crowd.instanceColor.needsUpdate = true;
scene.add(crowd);
const obstacles = [];
function placeObstacle(type, x, z, rot) {
const y = terrainHeight(x,z);
let mesh, radius, height;
if (type === 'barrier') {
mesh = new THREE.Mesh(new THREE.BoxGeometry(3.0, 1.0, 0.6), new THREE.MeshStandardMaterial({color:0x9aa0a6, roughness:0.6, metalness:0.2}));
radius = 1.75; height = 1.0;
} else if (type === 'debris') {
const g = new THREE.Group();
const mat = new THREE.MeshStandardMaterial({color:0x7b6a52, roughness:0.95});
for (let i=0;i<6;i++) {
const s = new THREE.Mesh(new THREE.DodecahedronGeometry(0.32 + Math.random()*0.22, 0), mat);
s.position.set((Math.random()-0.5)*1.3, 0.28 + Math.random()*0.45, (Math.random()-0.5)*1.3);
s.castShadow = true;
g.add(s);
}
mesh = g; radius = 1.35; height = 0.9;
} else if (type === 'tires') {
const g = new THREE.Group();
const mat = new THREE.MeshStandardMaterial({color:0x151515, roughness:0.9});
for (let i=0;i<4;i++) {
const c = new THREE.Mesh(new THREE.CylinderGeometry(0.45,0.45,0.35,12), mat);
c.rotation.z = Math.PI/2;
c.position.set((i%2)*0.55 - 0.27, 0.22 + i*0.3, Math.floor(i/2)*0.55 - 0.27);
c.castShadow = true;
g.add(c);
}
mesh = g; radius = 1.15; height = 1.25;
} else if (type === 'ramp') {
mesh = new THREE.Mesh(new THREE.BoxGeometry(3.6, 0.45, 2.3), new THREE.MeshStandardMaterial({color:0x55606b, roughness:0.7, metalness:0.15}));
radius = 2.05; height = 0.45;
}
mesh.position.set(x, y + height/2, z);
if (type === 'ramp') mesh.rotation.x = -0.34;
mesh.rotation.y = rot || 0;
mesh.castShadow = true;
mesh.receiveShadow = true;
scene.add(mesh);
obstacles.push({type, mesh, x, z, radius, destroyed:false});
}
for (let i=0;i<6;i++) {
const a = i/6*Math.PI*2;
placeObstacle('barrier', 12*Math.cos(a), 9*Math.sin(a), Math.atan2(9*Math.sin(a), 12*Math.cos(a)) + Math.PI/2);
}
for (let i=0;i<5;i++) {
const a = i/5*Math.PI*2 + 0.4;
placeObstacle('debris', 6.2*Math.cos(a), 4.8*Math.sin(a), Math.random()*Math.PI);
}
for (let i=0;i<6;i++) {
const a = i/6*Math.PI*2 + 0.2;
placeObstacle('tires', 15.5*Math.cos(a), 11.8*Math.sin(a), Math.random()*Math.PI);
}
for (let i=0;i<4;i++) {
const a = i/4*Math.PI*2 + 0.7;
placeObstacle('ramp', 9.5*Math.cos(a), 7.2*Math.sin(a), Math.random()*Math.PI);
}
function createTruck(color) {
const group = new THREE.Group();
const chassisMat = new THREE.MeshStandardMaterial({color, roughness:0.35, metalness:0.35, emissive:0x000000, emissiveIntensity:0});
const chassis = new THREE.Mesh(new THREE.BoxGeometry(2.35, 0.62, 4.1), chassisMat);
chassis.position.y = 0.55;
chassis.castShadow = true;
group.add(chassis);
const cabin = new THREE.Mesh(new THREE.BoxGeometry(1.95, 0.78, 1.75), new THREE.MeshStandardMaterial({color:0x1a1d24, roughness:0.5, metalness:0.2}));
cabin.position.set(0, 1.05, -0.55);
cabin.castShadow = true;
group.add(cabin);
const wheelGeo = new THREE.CylinderGeometry(0.46,0.46,0.34,12);
const wheelMat = new THREE.MeshStandardMaterial({color:0x0f0f0f, roughness:0.95});
const wheelPositions = [[-1.05,0.46,1.35],[1.05,0.46,1.35],[-1.05,0.46,-1.35],[1.05,0.46,-1.35]];
const wheels = [];
wheelPositions.forEach((p) => {
const w = new THREE.Mesh(wheelGeo, wheelMat);
w.rotation.z = Math.PI/2;
w.position.set(p[0],p[1],p[2]);
w.castShadow = true;
group.add(w);
wheels.push(w);
});
group.userData.wheels = wheels;
group.userData.chassis = chassis;
return group;
}
const truckColors = [0x1f7cff, 0xff3b30, 0xffcc00, 0x34c759, 0xff8c00];
const trucks = [];
for (let i=0;i<5;i++) {
const mesh = createTruck(truckColors[i]);
const a = i/5*Math.PI*2;
const r = 7 + (i%2)*3;
const x = r*Math.cos(a);
const z = r*Math.sin(a);
mesh.position.set(x, terrainHeight(x,z)+0.45, z);
scene.add(mesh);
trucks.push({
id:i,
isPlayer: i===0,
mesh,
x, z,
vx:0, vz:0,
angle: a + Math.PI,
angVel:0,
throttleInput:0,
steerInput:0,
health:100,
wrecked:false,
flash:0,
hitCooldown:0,
wheels: mesh.userData.wheels,
chassis: mesh.userData.chassis,
orbitR: 9 + i*2.1,
orbitA: a,
orbitSpeed: 0.32 + (i%3)*0.07
});
}
const particles = [];
function addSmoke(x,z) {
for (let i=0;i<10;i++) {
const m = new THREE.Mesh(new THREE.SphereGeometry(0.24,6,6), new THREE.MeshBasicMaterial({color:0x8a8a8a, transparent:true, opacity:0.7}));
m.position.set(x + (Math.random()-0.5)*1.6, 0.5, z + (Math.random()-0.5)*1.6);
scene.add(m);
particles.push({mesh:m, vx:(Math.random()-0.5)*2.2, vy:1.2+Math.random()*2.0, vz:(Math.random()-0.5)*2.2, life:1.6});
}
}
function wreckTruck(t) {
if (t.wrecked) return;
t.wrecked = true;
t.health = 0;
t.vx *= 0.15; t.vz *= 0.15; t.angVel = 0;
t.mesh.traverse((o) => {
if (o.isMesh && o.material) {
o.material = o.material.clone();
o.material.color.set(0x2a2a2a);
if (o.material.emissive) { o.material.emissive.set(0x330000); o.material.emissiveIntensity = 0.35; }
}
});
t.chassis = t.mesh.children[0];
addSmoke(t.x, t.z);
}
function normAngle(a) {
while (a > Math.PI) a -= Math.PI*2;
while (a < -Math.PI) a += Math.PI*2;
return a;
}
function updateAI(t, dt) {
if (t.wrecked) { t.throttleInput = 0; t.steerInput = 0; return; }
t.orbitA += t.orbitSpeed * dt;
let tx = t.orbitR * Math.cos(t.orbitA);
let tz = t.orbitR * 0.72 * Math.sin(t.orbitA);
let ax = 0, az = 0;
for (const other of trucks) {
if (other === t) continue;
const dx = t.x - other.x;
const dz = t.z - other.z;
const d = Math.hypot(dx,dz);
if (d > 0.01 && d < 5.0) {
const push = (5.0 - d) * 0.75;
ax += (dx/d)*push;
az += (dz/d)*push;
}
}
let nearest = 99;
for (const obs of obstacles) {
if (obs.destroyed) continue;
const dx = t.x - obs.x;
const dz = t.z - obs.z;
const d = Math.hypot(dx,dz);
if (d < nearest) nearest = d;
const avoidR = obs.radius + 2.6;
if (d > 0.01 && d < avoidR) {
const push = (avoidR - d) * 0.9;
ax += (dx/d)*push;
az += (dz/d)*push;
}
}
const bx = t.x/18, bz = t.z/14;
const br = Math.hypot(bx,bz);
if (br > 0.82) {
ax -= t.x * 0.08;
az -= t.z * 0.08;
}
const desiredX = tx + ax*2.2;
const desiredZ = tz + az*2.2;
const desiredAngle = Math.atan2(desiredZ - t.z, desiredX - t.x);
const diff = normAngle(desiredAngle - t.angle);
t.steerInput = Math.max(-1, Math.min(1, diff*1.9));
t.throttleInput = (nearest < 2.8) ? 0.35 : 0.82;
}
function updateTruck(t, dt) {
if (t.isPlayer && !t.wrecked) {
t.throttleInput = keys.up ? 1.0 : (keys.down ? -0.55 : 0);
t.steerInput = keys.left ? 1.0 : (keys.right ? -1.0 : 0);
}
if (!t.isPlayer) updateAI(t, dt);
if (t.wrecked) {
t.throttleInput = 0;
t.steerInput = 0;
}
let fx = Math.cos(t.angle);
let fz = Math.sin(t.angle);
let rx = -Math.sin(t.angle);
let rz = Math.cos(t.angle);
let fs = t.vx*fx + t.vz*fz;
let ls = t.vx*rx + t.vz*rz;
fs += t.throttleInput * 13 * dt;
fs *= 0.985;
ls *= 0.90;
t.angVel += t.steerInput * 2.3 * dt * (1 + Math.min(Math.abs(fs), 10)*0.06);
t.angVel *= 0.88;
t.angle += t.angVel * dt;
fx = Math.cos(t.angle); fz = Math.sin(t.angle);
rx = -Math.sin(t.angle); rz = Math.cos(t.angle);
t.vx = fx*fs + rx*ls;
t.vz = fz*fs + rz*ls;
t.x += t.vx*dt;
t.z += t.vz*dt;
const br = Math.hypot(t.x/18, t.z/14);
if (br > 0.985) {
const scale = 0.985/br;
t.x *= scale; t.z *= scale;
const nX = t.x/18, nZ = t.z/14;
const nL = Math.hypot(nX,nZ) || 1;
const nnX = nX/nL, nnZ = nZ/nL;
const vn = t.vx*nnX + t.vz*nnZ;
if (vn > 0) {
t.vx -= 1.5*vn*nnX;
t.vz -= 1.5*vn*nnZ;
}
}
const y = terrainHeight(t.x, t.z) + 0.45;
t.mesh.position.set(t.x, y, t.z);
t.mesh.rotation.y = t.angle;
const eps = 0.45;
const dhdx = (terrainHeight(t.x+eps,t.z)-terrainHeight(t.x-eps,t.z))/(2*eps);
const dhdz = (terrainHeight(t.x,t.z+eps)-terrainHeight(t.x,t.z-eps))/(2*eps);
t.mesh.rotation.x = -Math.atan(dhdz);
t.mesh.rotation.z = Math.atan(dhdx);
if (t.wrecked) t.mesh.rotation.z += 0.4;
const speed = Math.hypot(t.vx,t.vz);
for (const w of t.wheels) {
if (!t.wrecked) w.rotation.x += speed*dt*2.0;
}
t.hitCooldown = Math.max(0, t.hitCooldown - dt);
if (t.flash > 0) {
t.flash = Math.max(0, t.flash - dt);
if (t.chassis && t.chassis.material && t.chassis.material.emissive) {
t.chassis.material.emissiveIntensity = t.flash*3.2;
if (t.flash > 0) t.chassis.material.emissive.setHex(0xffffff);
}
} else if (t.chassis && t.chassis.material && t.chassis.material.emissive && !t.wrecked) {
t.chassis.material.emissiveIntensity = 0;
}
}
function handleCollisions() {
for (const t of trucks) {
for (const obs of obstacles) {
if (obs.destroyed) continue;
const dx = t.x - obs.x;
const dz = t.z - obs.z;
const d = Math.hypot(dx,dz);
const minD = 1.15 + obs.radius;
if (d > 0.001 && d < minD) {
const nx = dx/d, nz = dz/d;
const overlap = minD - d;
t.x += nx*overlap;
t.z += nz*overlap;
const vn = t.vx*nx + t.vz*nz;
if (vn < 0) {
t.vx -= (1+0.35)*vn*nx;
t.vz -= (1+0.35)*vn*nz;
}
if (!t.wrecked) t.flash = 0.2;
if (obs.type === 'debris' && Math.hypot(t.vx,t.vz) > 1.8 && running) {
obs.destroyed = true;
obs.mesh.visible = false;
score += 25;
}
}
}
}
for (let i=0;i<trucks.length;i++) {
for (let j=i+1;j<trucks.length;j++) {
const a = trucks[i], b = trucks[j];
const dx = b.x - a.x;
const dz = b.z - a.z;
const d = Math.hypot(dx,dz);
const minD = 2.3;
if (d > 0.001 && d < minD) {
const nx = dx/d, nz = dz/d;
const overlap = minD - d;
a.x -= nx*overlap*0.5;
a.z -= nz*overlap*0.5;
b.x += nx*overlap*0.5;
b.z += nz*overlap*0.5;
const rvx = b.vx - a.vx;
const rvz = b.vz - a.vz;
const rvn = rvx*nx + rvz*nz;
if (rvn < 0) {
const impulse = -(1+0.42)*rvn*0.5;
a.vx -= impulse*nx;
a.vz -= impulse*nz;
b.vx += impulse*nx;
b.vz += impulse*nz;
}
const relSpeed = Math.hypot(rvx,rvz);
if (!a.wrecked) a.flash = 0.18;
if (!b.wrecked) b.flash = 0.18;
if (relSpeed > 3.0 && running && a.hitCooldown <= 0 && b.hitCooldown <= 0) {
if (a.isPlayer && !b.isPlayer && !b.wrecked) {
b.health -= relSpeed*9;
if (b.health <= 0) wreckTruck(b);
score += 250;
}
if (b.isPlayer && !a.isPlayer && !a.wrecked) {
a.health -= relSpeed*9;
if (a.health <= 0) wreckTruck(a);
score += 250;
}
if (!a.isPlayer && !b.isPlayer) {
if (relSpeed > 4.5) {
if (!a.wrecked) { a.health -= relSpeed*6; if (a.health <= 0) wreckTruck(a); }
if (!b.wrecked) { b.health -= relSpeed*6; if (b.health <= 0) wreckTruck(b); }
}
}
a.hitCooldown = 0.8;
b.hitCooldown = 0.8;
}
}
}
}
}
function updateParticles(dt) {
for (let i=particles.length-1;i>=0;i--) {
const p = particles[i];
p.life -= dt;
if (p.life <= 0) {
scene.remove(p.mesh);
p.mesh.geometry.dispose();
p.mesh.material.dispose();
particles.splice(i,1);
continue;
}
p.mesh.position.x += p.vx*dt;
p.mesh.position.y += p.vy*dt;
p.mesh.position.z += p.vz*dt;
p.vy -= 1.8*dt;
p.mesh.material.opacity = Math.max(0, (p.life/1.6)*0.7);
const s = 1 + (1.6 - p.life)*0.9;
p.mesh.scale.set(s,s,s);
}
}
const scoreEl = document.getElementById('score');
const timeEl = document.getElementById('time');
const arenaEl = document.getElementById('arenaName');
arenaEl.textContent = ARENA_NAME;
document.getElementById('photoName').textContent = ARENA_NAME;
let lastTime = performance.now();
function loop(now) {
const dt = Math.min(0.033, (now - lastTime)/1000);
lastTime = now;
if (!paused) {
if (running) {
timeLeft -= dt;
if (timeLeft <= 0) {
timeLeft = 0;
running = false;
}
}
for (const t of trucks) updateTruck(t, dt);
handleCollisions();
updateParticles(dt);
}
const player = trucks[0];
const fx = Math.cos(player.angle);
const fz = Math.sin(player.angle);
const desiredX = player.x - fx*11;
const desiredY = terrainHeight(player.x,player.z) + 9;
const desiredZ = player.z - fz*11;
camera.position.x += (desiredX - camera.position.x)*0.08;
camera.position.y += (desiredY - camera.position.y)*0.08;
camera.position.z += (desiredZ - camera.position.z)*0.08;
camera.lookAt(player.x, terrainHeight(player.x,player.z)+1, player.z);
scoreEl.textContent = score;
timeEl.textContent = Math.ceil(timeLeft);
renderer.render(scene, camera);
requestAnimationFrame(loop);
}
requestAnimationFrame(loop);
window.addEventListener('resize', () => {
camera.aspect = window.innerWidth/window.innerHeight;
camera.updateProjectionMatrix();
renderer.setSize(window.innerWidth, window.innerHeight);
});
</script>
</body>
</html>
The notes
- Five trucks: Four AI rivals are given distinct orbit radii, orbit speeds, and phases, then receive separation forces from nearby trucks, obstacle-avoidance forces, and boundary steering so they spread around the arena instead of forming one moving wall.
- Demo mode:
#demoinitializes the real variablesscore = 5000andtimeLeft = 20before the simulation starts, so the countdown and scoring logic use those values directly rather than displaying a fake overlay. - Photo mode: Pressing
Psetspaused = true, which skips the entireupdateTruck, collision, particle, and clock-update block while still callingrenderer.render, so the simulation genuinely stops behind the overlay. - Collisions: Trucks and obstacles are treated as circles in the XZ plane; overlaps are resolved by pushing bodies apart, velocities are reflected with restitution, truck-truck impacts apply equal-mass impulses along the collision normal, debris is destroyed on sufficiently fast hits, and rivals lose health and enter a wreck state when rammed hard enough.
Attachments
reflection/beam-1.0-501b-a23b — page