Run Detail
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Provider
openrouter
Challenge Version
v1.0
Turns
1
Duration
57.2s
Total Tokens
16,720
Input Tokens
386
Output Tokens
16,334
Reasoning Tokens
11,265
Reasoning Effort
default
Est. Cost
$0.0000
Started
10/15/2026, 3:46:30 PM
OR Provider
Nvidia
Finish Reason
stop
Generation ID
gen-1792079190-lO7lsb3gDx5CaD8ZCc3s
Turns (1)
Turn #1
386 in16,334 out11,265 reasoning16,720 total57.1s
user
You build physics toys, and you have held an umbrella in a gale.
Build me a single HTML page: a person holding an umbrella in wind that keeps getting stronger.
The build
- The wind rises over time, and I can drive it myself as well — slider, keys, your call — including back down.
- The umbrella answers the wind. The canopy flexes, the frame loads up, and past some point it turns inside out. It can be wrenched sideways, and it can get away entirely.
- Rain falls, and its direction and speed follow the wind.
- The person compensates: lean, grip, footing, bracing. They stay attached to the ground; the umbrella stays attached to them until it doesn't.
- Show the current wind speed on screen.
- The art is yours. Side view is the obvious choice and you do not have to take it.
House rules
- One file. Everything inline — no CDN, no external stylesheet, font, script or image.
data:URIs are fine. - No libraries. No physics engine — write your own.
- No network at runtime.
- No
localStorage,sessionStorage, cookies orindexedDB— sandboxed frame, they throw. - Return the file as exactly one fenced
htmlblock.
Answer in exactly these sections
The model
One paragraph, before the file: what the canopy is made of in your code, what inversion is as a state change, and what decides when it happens.
The page
The single fenced html block.
What it actually does
Where it looks right and where it looks wrong. Everyone who has held an umbrella knows what one does in wind, so say what yours gets wrong before I find it.
assistant
The model
The canopy is a discrete chain of mass points strung along an arc beneath the shaft; each point is tied to the shaft tip by a rib spring, to its neighbours by a hoop spring, and softly to a target arc that represents the fabric’s resting shape. Inversion is a state change: once sustained wind pressure crosses a threshold, an interpolation flips the sign of the canopy’s vertical offset, turning the dome into a bowl, and the umbrella stays broken even if the wind later drops. A separate, higher wind threshold starts a grip timer; if the gale is held long enough, the handle snaps from the hand and the umbrella becomes a wind-blown projectile.
The page
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Umbrella in the Gale</title>
<style>
* { margin: 0; padding: 0; box-sizing: border-box; }
html, body { width: 100%; height: 100%; overflow: hidden; background: #9db8d2; font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; }
#canvas { display: block; width: 100%; height: 100%; }
#ui { position: absolute; top: 16px; left: 16px; pointer-events: none; }
#ui > * { pointer-events: auto; }
.hud { background: rgba(255,255,255,0.9); border-radius: 10px; padding: 14px 18px; box-shadow: 0 4px 14px rgba(0,0,0,0.18); border: 1px solid rgba(255,255,255,0.6); }
.wind-row { display: flex; align-items: baseline; gap: 8px; margin-bottom: 10px; }
.wind-big { font-size: 34px; font-weight: 900; color: #1d4e89; }
.wind-unit { font-size: 13px; color: #666; margin-left: 2px; }
.control { font-size: 13px; color: #333; margin-bottom: 6px; }
.control label { display: block; margin: 3px 0; cursor: pointer; }
input[type=range] { width: 190px; vertical-align: middle; }
.hint { font-size: 11.5px; color: #777; margin-top: 6px; line-height: 1.4; }
.status { margin-top: 8px; font-weight: 700; font-size: 13px; }
.ok { color: #2e7d32; }
.bad { color: #c62828; }
</style>
</head>
<body>
<canvas id="canvas"></canvas>
<div id="ui">
<div class="hud">
<div class="wind-row">
<span>WIND</span>
<span id="windVal" class="wind-big">0.0</span>
<span class="wind-unit">m/s</span>
</div>
<div class="control">
<label><input type="range" id="windSlider" min="0" max="140" value="0"> <span id="sliderVal">0</span></label>
</div>
<div class="control">
<label><input type="checkbox" id="autoWind" checked> Let the gale rise on its own</label>
</div>
<div class="hint">↑ / → to push up · ↓ / ← to ease back · grab the slider to seize control</div>
<div id="status" class="status ok">CANOPY: HOLDING</div>
</div>
</div>
<script>
const canvas = document.getElementById('canvas');
const ctx = canvas.getContext('2d', { alpha: false });
let W, H;
function resize(){ W = canvas.width = innerWidth; H = canvas.height = innerHeight; }
addEventListener('resize', resize);
resize();
/* ---------- State ---------- */
let wind = 0;
let targetWind = 0;
let windAuto = true;
const WIND_MAX = 140;
const umbrella = {
attached: true,
inverted: false,
invProg: 0,
handle: { x: 0, y: 0 },
top: { x: 0, y: 0, vx: 0, vy: 0 },
shaftAng: 0,
canopy: [],
ptCount: 25,
radius: 78,
stiffness: 0.11,
ribStiff: 0.13,
hoopStiff: 0.05,
damping: 0.89,
gravity: 0.12,
windForce: 0.07,
liftForce: 0.04,
detachTimer: 0,
DETACH_FRAMES: 45,
INVERT_THRESH: 72,
DETACH_THRESH: 112
};
const person = {
cx: 0, footY: 0,
lean: 0,
shoulder: { x: 0, y: 0 },
hand: { x: 0, y: 0 },
armAng: -0.35
};
const rain = [];
const RAIN_N = 150;
for (let i = 0; i < RAIN_N; i++) {
rain.push({
x: Math.random() * W,
y: Math.random() * H,
vx: 0,
vy: 2 + Math.random() * 3,
len: 5 + Math.random() * 8
});
}
/* ---------- Input ---------- */
const $s = document.getElementById('windSlider');
const $sv = document.getElementById('sliderVal');
const $wv = document.getElementById('windVal');
const $auto = document.getElementById('autoWind');
const $status = document.getElementById('status');
function setTarget(v){
targetWind = Math.max(0, Math.min(WIND_MAX, v));
$s.value = targetWind;
$sv.textContent = Math.round(targetWind);
}
$s.addEventListener('input', e => {
setTarget(parseFloat(e.target.value));
windAuto = false;
$auto.checked = false;
});
$auto.addEventListener('change', e => { windAuto = e.target.checked; });
addEventListener('keydown', e => {
const k = e.key;
if (k === 'ArrowUp' || k === 'ArrowRight') { setTarget(targetWind + 4); windAuto = false; $auto.checked = false; e.preventDefault(); }
if (k === 'ArrowDown' || k === 'ArrowLeft') { setTarget(targetWind - 4); windAuto = false; $auto.checked = false; e.preventDefault(); }
});
/* ---------- Canopy init ---------- */
function buildCanopy(){
umbrella.canopy = [];
const step = Math.PI / (umbrella.ptCount - 1);
for (let i = 0; i < umbrella.ptCount; i++) {
umbrella.canopy.push({
a: step * i,
x: 0, y: 0,
vx: 0, vy: 0
});
}
}
buildCanopy();
/* ---------- Update ---------- */
function update(){
/* Wind */
if (windAuto) {
targetWind += 0.014;
if (targetWind > WIND_MAX) targetWind = WIND_MAX;
}
wind += (targetWind - wind) * 0.05;
$wv.textContent = wind.toFixed(1);
/* Person anchor */
person.cx = W * 0.46;
person.footY = H - 52;
const hip = { x: person.cx, y: person.footY - 112 };
/* Lean into wind (wind blows +x, so lean -x) */
const targetLean = -Math.min(0.85, wind * 0.010);
person.lean += (targetLean - person.lean) * 0.08;
const sLen = 112;
person.shoulder.x = hip.x + Math.sin(person.lean) * sLen;
person.shoulder.y = hip.y - Math.cos(person.lean) * sLen;
/* Arm reaches up and slightly downwind */
person.armAng = -0.4 + person.lean * 0.5 + Math.min(0.5, wind * 0.005);
person.hand.x = person.shoulder.x + Math.sin(person.armAng) * 98;
person.hand.y = person.shoulder.y - Math.cos(person.armAng) * 98;
/* Umbrella handle pinned to hand while attached */
if (umbrella.attached) {
umbrella.handle.x = person.hand.x;
umbrella.handle.y = person.hand.y;
}
/* Shaft bends downwind */
const targetShaft = Math.min(1.2, wind * 0.009);
umbrella.shaftAng += (targetShaft - umbrella.shaftAng) * 0.06;
const shaftLen = 156;
if (umbrella.attached) {
umbrella.top.x = umbrella.handle.x + Math.sin(umbrella.shaftAng) * shaftLen;
umbrella.top.y = umbrella.handle.y - Math.cos(umbrella.shaftAng) * shaftLen;
umbrella.top.vx = umbrella.top.vy = 0;
} else {
/* Flying projectile */
umbrella.top.vx += wind * 0.025;
umbrella.top.vy += umbrella.gravity;
umbrella.top.x += umbrella.top.vx;
umbrella.top.y += umbrella.top.vy;
umbrella.top.vx *= 0.97;
umbrella.top.vy *= 0.97;
umbrella.shaftAng += 0.06;
}
/* Inversion state change */
if (!umbrella.inverted && wind > umbrella.INVERT_THRESH) {
umbrella.invProg += 0.014;
if (umbrella.invProg >= 1) { umbrella.invProg = 1; umbrella.inverted = true; }
}
const sign = 1 - 2 * umbrella.invProg; /* +1 dome, -1 bowl */
/* Canopy targets */
const cx = umbrella.top.x, cy = umbrella.top.y;
for (const p of umbrella.canopy) {
p.tx = cx + Math.cos(p.a) * umbrella.radius;
p.ty = cy - Math.sin(p.a) * umbrella.radius * sign;
}
/* Canopy physics */
const n = umbrella.canopy.length;
for (let i = 0; i < n; i++) {
const p = umbrella.canopy[i];
let fx = wind * umbrella.windForce;
let fy = umbrella.gravity - wind * umbrella.liftForce * Math.sin(p.a);
fx += (p.tx - p.x) * umbrella.stiffness;
fy += (p.ty - p.y) * umbrella.stiffness;
fx += (cx - p.x) * umbrella.ribStiff;
fy += (cy - p.y) * umbrella.ribStiff;
const prev = umbrella.canopy[(i - 1 + n) % n];
const next = umbrella.canopy[(i + 1) % n];
fx += (prev.x - p.x) * umbrella.hoopStiff + (next.x - p.x) * umbrella.hoopStiff;
fy += (prev.y - p.y) * umbrella.hoopStiff + (next.y - p.y) * umbrella.hoopStiff;
p.vx += fx; p.vy += fy;
p.vx *= umbrella.damping; p.vy *= umbrella.damping;
p.x += p.vx; p.y += p.vy;
}
/* Detachment */
if (umbrella.attached) {
if (wind > umbrella.DETACH_THRESH) {
umbrella.detachTimer++;
if (umbrella.detachTimer > umbrella.DETACH_FRAMES) {
umbrella.attached = false;
umbrella.top.vx = wind * 0.45;
umbrella.top.vy = -6;
}
} else {
umbrella.detachTimer = Math.max(0, umbrella.detachTimer - 1);
}
}
/* Rain driven by wind */
for (const r of rain) {
r.vx = wind * 0.38;
r.vy = 5.5 + wind * 0.05;
r.x += r.vx;
r.y += r.vy;
if (r.y > H) { r.y = -20; r.x = Math.random() * W; }
if (r.x > W + 20) r.x = -20;
if (r.x < -20) r.x = W + 20;
}
/* Status text */
if (!umbrella.attached) $status.textContent = 'CANOPY: GONE';
else if (umbrella.inverted) $status.textContent = 'CANOPY: INSIDE OUT';
else if (wind > umbrella.INVERT_THRESH * 0.8) $status.textContent = 'CANOPY: STRAINING';
else $status.textContent = 'CANOPY: HOLDING';
$status.className = 'status ' + (!umbrella.attached || umbrella.inverted ? 'bad' : 'ok');
}
/* ---------- Draw ---------- */
function draw(){
/* Sky darkens with wind */
const sky = Math.min(1, wind / 140);
ctx.fillStyle = `rgb(${Math.round(155 - 70*sky)},${Math.round(185 - 90*sky)},${Math.round(215 - 110*sky)})`;
ctx.fillRect(0, 0, W, H);
/* Rain */
ctx.strokeStyle = `rgba(170, 205, 250, ${0.25 + 0.45*sky})`;
ctx.lineWidth = 1.6;
ctx.lineCap = 'round';
ctx.beginPath();
for (const r of rain) {
ctx.moveTo(r.x, r.y);
ctx.lineTo(r.x - r.vx * 1.8, r.y - r.vy * 1.8);
}
ctx.stroke();
/* Ground */
ctx.strokeStyle = '#6b7a52';
ctx.lineWidth = 5;
ctx.beginPath();
ctx.moveTo(0, person.footY);
ctx.lineTo(W, person.footY);
ctx.stroke();
/* Feet */
ctx.fillStyle = '#333';
const spread = Math.min(34, wind * 0.28);
ctx.fillRect(person.cx - 20 - spread, person.footY, 24, 11);
ctx.fillRect(person.cx + 6 + spread, person.footY, 24, 11);
/* Legs */
ctx.strokeStyle = '#5a4430';
ctx.lineWidth = 8;
ctx.lineCap = 'round';
const hip = { x: person.cx, y: person.footY - 112 };
ctx.beginPath();
ctx.moveTo(hip.x, hip.y);
ctx.lineTo(person.cx - 20 - spread, person.footY);
ctx.stroke();
ctx.beginPath();
ctx.moveTo(hip.x, hip.y);
ctx.lineTo(person.cx + 6 + spread, person.footY);
ctx.stroke();
/* Torso */
ctx.beginPath();
ctx.moveTo(hip.x, hip.y);
ctx.lineTo(person.shoulder.x, person.shoulder.y);
ctx.stroke();
/* Head */
const hx = person.shoulder.x + Math.sin(person.lean) * 12;
const hy = person.shoulder.y - 30;
ctx.fillStyle = '#e8cfa8';
ctx.beginPath();
ctx.arc(hx, hy, 16, 0, Math.PI * 2);
ctx.fill();
ctx.strokeStyle = '#5d4037';
ctx.lineWidth = 2;
ctx.beginPath();
ctx.moveTo(hx - 7, hy - 2); ctx.lineTo(hx - 3, hy + 2);
ctx.moveTo(hx + 3, hy - 2); ctx.lineTo(hx + 7, hy + 2);
ctx.stroke();
/* Arm */
ctx.beginPath();
ctx.moveTo(person.shoulder.x, person.shoulder.y);
ctx.lineTo(person.hand.x, person.hand.y);
ctx.stroke();
/* Hand */
ctx.fillStyle = umbrella.attached ? '#c99070' : '#e8cfa8';
ctx.beginPath();
ctx.arc(person.hand.x, person.hand.y, 8, 0, Math.PI * 2);
ctx.fill();
/* Grip strain marks */
if (wind > 45 && umbrella.attached) {
ctx.strokeStyle = 'rgba(190, 40, 40, 0.35)';
ctx.lineWidth = 2;
for (let i = 0; i < Math.min(6, wind / 18); i++) {
const jitter = (Math.random() - 0.5) * 8;
ctx.beginPath();
ctx.moveTo(person.hand.x + jitter, person.hand.y + jitter);
ctx.lineTo(person.hand.x + Math.sin(person.armAng) * 14 + jitter,
person.hand.y - Math.cos(person.armAng) * 14 + jitter);
ctx.stroke();
}
}
/* Umbrella */
if (umbrella.attached) {
/* Shaft */
ctx.strokeStyle = '#777';
ctx.lineWidth = 4.5;
ctx.lineCap = 'round';
ctx.beginPath();
ctx.moveTo(umbrella.handle.x, umbrella.handle.y);
ctx.lineTo(umbrella.top.x, umbrella.top.y);
ctx.stroke();
/* Ribs */
ctx.strokeStyle = '#555';
ctx.lineWidth = 1.4;
for (const p of umbrella.canopy) {
ctx.beginPath();
ctx.moveTo(umbrella.top.x, umbrella.top.y);
ctx.lineTo(p.x, p.y);
ctx.stroke();
}
/* Canopy fabric */
const col = umbrella.inverted ? '#e4572e' : '#f2c94c';
const fill = umbrella.inverted ? 'rgba(228,87,46,0.4)' : 'rgba(242,201,76,0.45)';
ctx.strokeStyle = col;
ctx.fillStyle = fill;
ctx.lineWidth = 2.2;
ctx.beginPath();
ctx.moveTo(umbrella.canopy[0].x, umbrella.canopy[0].y);
for (let i = 1; i < umbrella.canopy.length; i++) {
ctx.lineTo(umbrella.canopy[i].x, umbrella.canopy[i].y);
}
ctx.closePath();
ctx.fill();
ctx.stroke();
} else {
/* Flying away */
ctx.save();
ctx.translate(umbrella.top.x, umbrella.top.y);
ctx.rotate(umbrella.shaftAng);
ctx.strokeStyle = '#777';
ctx.lineWidth = 4.5;
ctx.beginPath();
ctx.moveTo(0, 0);
ctx.lineTo(0, -156);
ctx.stroke();
ctx.strokeStyle = '#e4572e';
ctx.fillStyle = 'rgba(228,87,46,0.4)';
ctx.lineWidth = 2.2;
ctx.beginPath();
ctx.moveTo(0, -156);
const ca = Math.cos(umbrella.shaftAng), sa = Math.sin(umbrella.shaftAng);
for (const p of umbrella.canopy) {
const dx = p.x - umbrella.top.x;
const dy = p.y - umbrella.top.y;
ctx.lineTo(dx * ca - dy * sa, dx * sa + dy * ca);
}
ctx.closePath();
ctx.fill();
ctx.stroke();
ctx.restore();
}
}
/* ---------- Loop ---------- */
function loop(){
update();
draw();
requestAnimationFrame(loop);
}
loop();
</script>
</body>
</html>
What it actually does
It looks right in the broad beats: the canopy billows and loads up as the slider rises, the shaft leans downwind, the person leans into the gale and widens their stance, rain slants harder as the wind builds, and past roughly 72 m/s the canopy flips inside out and stays that way. Hold past roughly 112 m/s and the grip breaks, sending the umbrella tumbling away as a projectile while the person’s arm is left empty.
It looks wrong in the details you’d spot if you’d actually been caught in a gale. Because this is a side view, the umbrella is a 2D arc rather than a real fabric dome, so “inside out” reads as a curve snapping backward rather than a canopy collapsing and re-inflating inside-out. The rain is cosmetic streaks that never collide with the person or the umbrella. The physics is explicit Euler with springs, so at extreme wind the canopy can poke through the shaft or the person’s head, and there is no real friction or collision—just spring tension and damping. The auto-gale rises monotonically; there are no gusts, lulls, or sudden shifts in direction. Once the umbrella is gone or inverted, it never recovers, and the hand-to-handle connection is visual rather than a true constraint, so under violent load the handle can appear to separate slightly from the fingers before the detachment timer fires.
Attachments
nvidia/nemotron-3.5-super-vl:free — page