Flow-field particles · qwen3.6-35b-a3b
Using the pre-provided p5.min.js (global p5, instance or global mode), create a full-screen flow-field particle animation: thousands of particles advected by Perlin-noise vectors, leaving fading trails, with colors shifting over time.
transcript · 10 messages
Using the pre-provided p5.min.js (global p5, instance or global mode), create a full-screen flow-field particle animation: thousands of particles advected by Perlin-noise vectors, leaving fading trails, with colors shifting over time.
thinking
The user wants me to create a single-page web app with a flow-field particle animation using p5.min.js which is already in the current directory. Let me first check what files are in the current directory to confirm p5.min.js is there, then create the index.html file. The requirements: 1. Full-screen flow-field particle animation 2. Thousands of particles advected by Perlin-noise vectors 3. Fading trails 4. Colors shifting over time 5. All in one index.html file 6. No external resources - use local p5.min.js 7. CSS in <style>, JS in <script>, inline Let me build this with global mode p5.
{"command":"ls /workspace/p5*.js 2>/dev/null; ls /workspace/*.js /workspace/*.css 2>/dev/null"}/workspace/p5.min.js /workspace/p5.min.js Command exited with code 2
thinking
Good, p5.min.js exists. Now let me create the index.html file with the flow-field particle animation. Let me design this: 1. Full-screen canvas using p5 global mode 2. Thousands of particles (e.g., 3000+) 3. Each particle has position and velocity 4. Perlin noise determines flow field direction at each point 5. Particles move along the flow field 6. Fading trails by drawing a semi-transparent rect over the canvas each frame 7. Colors shift over time using HSL color mode, with hue based on time and particle position 8. Particles that go off-screen wrap around or get respawned Let me write this out.
/workspace/index.html (3116 bytes)Successfully wrote 3116 bytes to /workspace/index.html
thinking
The file has been written. Let me verify it's present and looks correct.
{"command":"ls -l /workspace/index.html /workspace/p5.min.js"}-rw-r--r-- 1 node node 3192 Jul 31 08:49 /workspace/index.html -rw-r--r-- 1 node node 1034532 Jul 31 08:49 /workspace/p5.min.js
thinking
Both files are present. Let me read back the index.html to confirm it looks correct.
{"path":"/workspace/index.html"}<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Flow Field</title> <style> *, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; } html, body { overflow: hidden; width: 100%; height: 100%; background: #000; } canvas { display: block; } </style> </head> <body> <script src="p5.min.js"></script> <script> const PARTICLE_COUNT = 4000; const STEP_SIZE = 4; const NOISE_SCALE = 0.005; const FADING = 0.03; const COLOR_SPEED = 0.4; let particles = []; let time = 0; function setup() { createCanvas(windowWidth, windowHeight); colorMode(HSB, 360, 100, 100, 100); background(0); noStroke(); for (let i = 0; i < PARTICLE_COUNT; i++) { particles.push(new Particle()); } } function draw() { // Fade trail fill(0, 0, 0, FADING * 100); noStroke(); rect(0, 0, width, height); time += COLOR_SPEED; for (let p of particles) { p.update(); p.show(); } } function windowResized() { resizeCanvas(windowWidth, windowHeight); background(0); } /* ─── Particle ─────────────────────────────────── */ class Particle { constructor() { this.pos = createVector(random(width), random(height)); this.prev = this.pos.copy(); this.vel = p5.Vector.random2D(); this.acc = createVector(0, 0); this.maxSpeed = random(1.5, 3.0); this.life = random(100, 400); this.age = 0; } update() { // Perlin-noise flow field let angle = noise( this.pos.x * NOISE_SCALE, this.pos.y * NOISE_SCALE, time * 0.003 ) * TWO_PI * 2.5; let flow = p5.Vector.fromAngle(angle); flow.mult(0.3); this.acc.add(flow); this.vel.add(this.acc); this.vel.limit(this.maxSpeed); this.prev = this.pos.copy(); this.pos.add(this.vel); this.acc.mult(0); this.age++; // Respawn off-screen or old particles if ( this.pos.x < 0 || this.pos.x > width || this.pos.y < 0 || this.pos.y > height || this.age > this.life ) { this.reset(); } } show() { // Hue shifts over time + particle position let hueVal = (time + this.pos.x * 0.08 + this.pos.y * 0.04) % 360; let alpha = Math.min(100, map(this.age, 0, this.life, 0, 80)); let size = map(this.age, 0, this.life, 1.0, 0.4); stroke(hueVal, 70, 100, alpha); strokeWeight(size); line(this.prev.x, this.prev.y, this.pos.x, this.pos.y); } reset() { this.pos = createVector(random(width), random(height)); this.prev = this.pos.copy(); this.vel = p5.Vector.random2D(); this.acc = createVector(0, 0); this.maxSpeed = random(1.5, 3.0); this.life = random(100, 400); this.age = 0; } } </script> </body> </html>
thinking
Everything looks good. The file is complete and self-contained. Let me provide a summary to the user.
Done. **`/workspace/index.html`** is ready — a single self-contained file using the local `p5.min.js`. Here's what it does: | Feature | Detail | |---|---| | **Particles** | 4,000 particles with individual lifespans (100–400 frames) | | **Flow field** | Perlin noise in 3D (`x, y, time`) drives each particle's steering angle, with a swirling multiplier (`× 2.5`) for organic-looking curves | | **Fading trails** | Each frame a semi-transparent black rectangle (`opacity 3%`) is drawn over the whole canvas, making old strokes slowly fade to black | | **Color shift** | HSL colors where hue = `time + x + y` offsets — the whole field chromatically cycles over time, and each particle's hue is location-dependent | | **Lifecycle** | Particles that go off-screen or grow too old respawn randomly, keeping the canvas perpetually populated | | **Responsive** | `windowResized()` handler re-creates the canvas on resize | Open `index.html` in any browser — no server or build step needed.
TAKE IT TO CODE
A single self-contained HTML file — copy it and open in any browser, or reuse the prompt with your own pi-agent run.
RUN
EVALUATION
Flowing, colorful Perlin-noise-driven particle trails animate continuously and evolve smoothly; inputs cause minor color/pattern shifts but no dramatic interactivity.
Vision grade · anthropic/claude-sonnet-5
MEASUREMENTS
Raw readings from the capture, not a verdict — the grade above is the only judgement. Percentages are how much of the screen changed; the measure under-reports sparse motion on a dark background.