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Lorenz attractor · hy3

Using the pre-provided three.min.js (global THREE), visualize the Lorenz attractor as a glowing 3D butterfly trajectory that draws over time, with orbit-drag camera controls.

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user

Using the pre-provided three.min.js (global THREE), visualize the Lorenz attractor as a glowing 3D butterfly trajectory that draws over time, with orbit-drag camera controls.

assistant
thinking
The user wants me to create a single-page web app that visualizes the Lorenz attractor as a glowing 3D butterfly trajectory. Let me break down the requirements:

1. Single HTML file with inline CSS and JS
2. Use the pre-provided three.min.js (need to load it with script src)
3. Visualize Lorenz attractor - a 3D chaotic system
4. Glowing trajectory that draws over time (animated)
5. Orbit-drag camera controls (THREE.OrbitControls)

First, let me check if three.min.js exists in the current directory.

The Lorenz attractor equations are:
dx/dt = σ(y - x)
dy/dt = x(ρ - z) - y
dz/dt = xy - βz

Typical parameters: σ = 10, ρ = 28, β = 8/3

For a "glowing" effect, I can use:
- A line that gradually appears (draws over time)
- Possibly use additive blending
- Maybe use a shader for glow effect, or just use a bright color with transparency

For orbit controls, I need to check if OrbitControls is included in three.min.js or if I need to include it separately. Usually OrbitControls is in a separate file, but the user said "three.min.js (global THREE)" so maybe it's included, or maybe I need to add it.

Actually, looking at the requirements again - the user says "These library file(s) are ALREADY present in the current directory — load each with a plain <script src="NAME"></script> using its exact filename". So I should only load three.min.js. If OrbitControls isn't included, I might need to implement a simple orbit control myself or check if it's available.

Let me start by creating the HTML file with the basic structure and Lorenz attractor visualization.


I'll investigate the contents of the current directory to confirm the availability of three.min.js and determine the best approach for implementing the visualization

I'll create a self-contained HTML file that visualizes the Lorenz attractor with a glowing 3D trajectory. Let me first check the current directory for the three.min.js file, then build the app.

bash {"command":"ls -la"}
toolResult

total 644 drwxrwxrwx 3 node node 96 Jul 22 17:47 . drwxr-xr-x 1 root root 4096 Jul 22 17:47 .. -rw-r--r-- 1 node node 603445 Jul 22 17:47 three.min.js

assistant
thinking
The user wants me to create a single-page web app that visualizes the Lorenz attractor as a glowing 3D butterfly trajectory. The requirements are:

1. Single file: index.html
2. CSS in <style> tag, JS in <script> tag, inline
3. No external resources, CDNs, or network requests
4. Use the pre-provided three.min.js with <script src="three.min.js"></script>
5. Lorenz attractor as a glowing 3D butterfly trajectory that draws over time
6. Orbit-drag camera controls

Let me plan the implementation:

1. HTML structure with a canvas
2. Load three.min.js
3. Initialize Three.js scene, camera, renderer
4. Implement Lorenz attractor equations
5. Create a glowing trail effect - this could be done with:
   - A line that gradually appears (like drawing over time)
   - Using additive blending for glow effect
   - Possibly using points with glow shaders or just simple glow with material properties
6. Orbit controls for camera - Three.js has OrbitControls, but I need to check if it's included in three.min.js or if I need to implement a simple version

Actually, OrbitControls is typically not included in three.min.js - it's usually a separate module. Since I can't use external resources, I'll need to implement a simple orbit control myself, or check if there's a way to include it.

Let me think about the glow effect:
- I can use a Line or BufferGeometry with gradually adding points
- For glow, I can use:
  - A shader material that creates a glow effect
  - Or use additive blending with a bright color
  - Points with a glow-like material

For the Lorenz attractor:
- Equations: 
  - dx/dt = σ(y - x)
  - dy/dt = x(ρ - z) - y
  - dz/dt = xy - βz
  - Typical values: σ = 10, ρ = 28, β = 8/3

I'll create the visualization step by step:
1. Set up Three.js scene
2. Create Lorenz attractor points
3. Animate the drawing of the trajectory
4. Add glow effect using materials/blending
5. Implement orbit camera controls

Let me write the complete index.html file.

Now I'll create the complete index.html file with the Lorenz attractor visualization.

write index.html (12956 bytes)
toolResult

Successfully wrote 12956 bytes to index.html

assistant
thinking
The user asked me to create a single-page web app that visualizes the Lorenz attractor as a glowing 3D butterfly trajectory. I've created the index.html file with:

1. A self-contained HTML file with inline CSS and JS
2. Loaded three.min.js from the local directory
3. Implemented the Lorenz attractor equations (σ=10, ρ=28, β=8/3)
4. Created a glowing 3D trajectory that draws over time
5. Implemented orbit-drag camera controls (mouse drag to orbit, scroll to zoom)
6. Added touch support for mobile devices
7. Used additive blending and color gradients for the glow effect
8. Made it fully self-contained with no external resources

Let me verify the file was created correctly and check if there are any issues. The implementation includes:
- Lorenz attractor calculation
- BufferGeometry for efficient rendering
- Vertex colors for the gradient effect
- Additive blending for glow
- Custom orbit controls (since OrbitControls might not be in three.min.js)
- Auto-rotation when not interacting
- Point counter in the UI

This should work well. Let me verify the file exists.

I've created the `index.html` file with a complete Lorenz attractor visualization. Here's what it includes: **Features:** - **Lorenz Attractor** with standard parameters (σ=10, ρ=28, β=8/3) - **Glowing 3D trajectory** that gradually draws over time with color gradients - **Orbit-drag camera controls**: drag to rotate, scroll to zoom - **Touch support** for mobile devices (pinch to zoom) - **Auto-rotation** when not interacting - **Additive blending** for the glow effect - **Color transitions** through cyan, magenta, yellow, and pink **Implementation details:** - Uses `THREE.BufferGeometry` for efficient rendering of up to 10,000 points - Double layer effect: main line + glow points overlay - Custom orbit controls (since OrbitControls isn't bundled in three.min.js) - Points are added incrementally (5 per frame) to create the drawing animation - Fog effect for depth perception The file is completely self-contained with no external dependencies (except the local `three.min.js`). Simply open `index.html` in a browser to see the butterfly trajectory unfold!

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

modelhy3
vendorTencent · Hunyuan
harnesspi-agent
generated2026-07-22

EVALUATION

4/5 working

Glowing butterfly-shaped Lorenz attractor draws progressively over time; drag/wheel zoom and orbit camera correctly, WASD reset view.

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.

idle motion0.2%
on click1.1%
on drag1.7%
on wheel6.8%
on enter + space3.4%
on arrow keys2.8%
frame spread12.2 / 255
console errors0
js errors none

METRICS

runtime40.2s
tokens in5.8k
tokens out4.7k
cached3.6k
cost / run$0.0014