Flow-field particles · gemma-4-31b-it
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.
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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 objective is to create a full-screen flow-field particle animation using `p5.js`.
The app must be a single `index.html` file.
`p5.min.js` is already provided in the current directory.
No external resources/CDNs.
* Full-screen canvas.
* Thousands of particles.
* Particles advected by a Perlin noise flow field.
* Fading trails (achieved by drawing a semi-transparent background every frame).
* Colors shifting over time.
* Initialize a `Particle` class with position and velocity.
* Create a 2D grid (the flow field) where each cell contains an angle derived from `noise()`.
* Update particles:
* Look up the current cell in the flow field.
* Apply a force based on the angle of that cell.
* Update position and velocity.
* Wrap around screen edges.
* Render particles:
* Draw a line from previous position to current position.
* Use a color that evolves over time (e.g., using HSB color mode).
* Background:
* Use `background(0, 0, 0, alpha)` to create trailing effects.
* `setup()`: Create canvas, initialize particles, set HSB color mode.
* `draw()`:
* Draw semi-transparent black background.
* Update and display particles.
* Shift the noise offset to make the flow field evolve (optional but looks better).
* `Particle` class:
* `pos`, `prevPos`, `vel`, `acc`.
* `update()`: apply force, update vel, update pos.
* `follow(vectors)`: get the vector from the field.
* `edges()`: wrap around.
* `show()`: draw line.
* Resolution of flow field (e.g., 20x20 pixel cells).
* Number of particles (e.g., 2000-5000).
* Noise scale (how "swirly" the flow is).
* Particle speed.
* Color cycle speed.index.html (4409 bytes)Successfully wrote 4409 bytes to index.html
The flow-field particle animation has been implemented in `index.html`. It utilizes the pre-provided `p5.min.js` to create a high-performance simulation where thousands of particles are guided by a 3D Perlin noise field (evolving over time). ### Implementation Details: - **Flow Field**: A grid of vectors is generated using `noise(x, y, z)`, where `z` increments every frame to make the vectors shift smoothly. - **Particle Dynamics**: Each particle applies the local flow field vector as a force, updating its velocity and position. - **Visuals**: - **Fading Trails**: A semi-transparent background is drawn every frame (`background(0, 0, 0, 10)`), creating a "motion blur" trail effect. - **Dynamic Colors**: The stroke color cycles through the HSB spectrum over time. - **Continuous Motion**: Particles wrap around the edges of the screen to maintain a constant density. - **Optimization**: The flow field is calculated on a grid (`stepSize = 20`) rather than per-pixel to ensure a smooth frame rate with 3,000 active particles. The app is entirely self-contained in `index.html`.
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
Flow-field particle trails animate continuously with shifting hues, though inputs seem to only affect color, not clear 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.