p5js

What this skill does

# p5.js Production Pipeline

## When to use

Use when users request: p5.js sketches, creative coding, generative art, interactive visualizations, canvas animations, browser-based visual art, data viz, shader effects, or any p5.js project.

## What's inside

Production pipeline for interactive and generative visual art using p5.js. Creates browser-based sketches, generative art, data visualizations, interactive experiences, 3D scenes, audio-reactive visuals, and motion graphics — exported as HTML, PNG, GIF, MP4, or SVG. Covers: 2D/3D rendering, noise and particle systems, flow fields, shaders (GLSL), pixel manipulation, kinetic typography, WebGL scenes, audio analysis, mouse/keyboard interaction, and headless high-res export.

## Creative Standard

This is visual art rendered in the browser. The canvas is the medium; the algorithm is the brush.

**Before writing a single line of code**, articulate the creative concept. What does this piece communicate? What makes the viewer stop scrolling? What separates this from a code tutorial example? The user's prompt is a starting point — interpret it with creative ambition.

**First-render excellence is non-negotiable.** The output must be visually striking on first load. If it looks like a p5.js tutorial exercise, a default configuration, or "AI-generated creative coding," it is wrong. Rethink before shipping.

**Go beyond the reference vocabulary.** The noise functions, particle systems, color palettes, and shader effects in the references are a starting vocabulary. For every project, combine, layer, and invent. The catalog is a palette of paints — you write the painting.

**Be proactively creative.** If the user asks for "a particle system," deliver a particle system with emergent flocking behavior, trailing ghost echoes, palette-shifted depth fog, and a background noise field that breathes. Include at least one visual detail the user didn't ask for but will appreciate.

**Dense, layered, considered.** Every frame should reward viewing. Never flat white backgrounds. Always compositional hierarchy. Always intentional color. Always micro-detail that only appears on close inspection.

**Cohesive aesthetic over feature count.** All elements must serve a unified visual language — shared color temperature, consistent stroke weight vocabulary, harmonious motion speeds. A sketch with ten unrelated effects is worse than one with three that belong together.

## Modes

| Mode | Input | Output | Reference |
|------|-------|--------|-----------|
| **Generative art** | Seed / parameters | Procedural visual composition (still or animated) | `references/visual-effects.md` |
| **Data visualization** | Dataset / API | Interactive charts, graphs, custom data displays | `references/interaction.md` |
| **Interactive experience** | None (user drives) | Mouse/keyboard/touch-driven sketch | `references/interaction.md` |
| **Animation / motion graphics** | Timeline / storyboard | Timed sequences, kinetic typography, transitions | `references/animation.md` |
| **3D scene** | Concept description | WebGL geometry, lighting, camera, materials | `references/webgl-and-3d.md` |
| **Image processing** | Image file(s) | Pixel manipulation, filters, mosaic, pointillism | `references/visual-effects.md` § Pixel Manipulation |
| **Audio-reactive** | Audio file / mic | Sound-driven generative visuals | `references/interaction.md` § Audio Input |

## Stack

Single self-contained HTML file per project. No build step required.

| Layer | Tool | Purpose |
|-------|------|---------|
| Core | p5.js 1.11.3 (CDN) | Canvas rendering, math, transforms, event handling |
| 3D | p5.js WebGL mode | 3D geometry, camera, lighting, GLSL shaders |
| Audio | p5.sound.js (CDN) | FFT analysis, amplitude, mic input, oscillators |
| Export | Built-in `saveCanvas()` / `saveGif()` / `saveFrames()` | PNG, GIF, frame sequence output |
| Capture | CCapture.js (optional) | Deterministic framerate video capture (WebM, GIF) |
| Headless | Puppeteer + Node.js (optional) | Automated high-res rendering, MP4 via ffmpeg |
| SVG | p5.js-svg 1.6.0 (optional) | Vector output for print — requires p5.js 1.x |
| Natural media | p5.brush (optional) | Watercolor, charcoal, pen — requires p5.js 2.x + WEBGL |
| Texture | p5.grain (optional) | Film grain, texture overlays |
| Fonts | Google Fonts / `loadFont()` | Custom typography via OTF/TTF/WOFF2 |

### Version Note

**p5.js 1.x** (1.11.3) is the default — stable, well-documented, broadest library compatibility. Use this unless a project requires 2.x features.

**p5.js 2.x** (2.2+) adds: `async setup()` replacing `preload()`, OKLCH/OKLAB color modes, `splineVertex()`, shader `.modify()` API, variable fonts, `textToContours()`, pointer events. Required for p5.brush. See `references/core-api.md` § p5.js 2.0.

## Pipeline

Every project follows the same 6-stage path:

```
CONCEPT → DESIGN → CODE → PREVIEW → EXPORT → VERIFY
```

1. **CONCEPT** — Articulate the creative vision: mood, color world, motion vocabulary, what makes this unique
2. **DESIGN** — Choose mode, canvas size, interaction model, color system, export format. Map concept to technical decisions
3. **CODE** — Write single HTML file with inline p5.js. Structure: globals → `preload()` → `setup()` → `draw()` → helpers → classes → event handlers
4. **PREVIEW** — Open in browser, verify visual quality. Test at target resolution. Check performance
5. **EXPORT** — Capture output: `saveCanvas()` for PNG, `saveGif()` for GIF, `saveFrames()` + ffmpeg for MP4, Puppeteer for headless batch
6. **VERIFY** — Does the output match the concept? Is it visually striking at the intended display size? Would you frame it?

## Creative Direction

### Aesthetic Dimensions

| Dimension | Options | Reference |
|-----------|---------|-----------|
| **Color system** | HSB/HSL, RGB, named palettes, procedural harmony, gradient interpolation | `references/color-systems.md` |
| **Noise vocabulary** | Perlin noise, simplex, fractal (octaved), domain warping, curl noise | `references/visual-effects.md` § Noise |
| **Particle systems** | Physics-based, flocking, trail-drawing, attractor-driven, flow-field following | `references/visual-effects.md` § Particles |
| **Shape language** | Geometric primitives, custom vertices, bezier curves, SVG paths | `references/shapes-and-geometry.md` |
| **Motion style** | Eased, spring-based, noise-driven, physics sim, lerped, stepped | `references/animation.md` |
| **Typography** | System fonts, loaded OTF, `textToPoints()` particle text, kinetic | `references/typography.md` |
| **Shader effects** | GLSL fragment/vertex, filter shaders, post-processing, feedback loops | `references/webgl-and-3d.md` § Shaders |
| **Composition** | Grid, radial, golden ratio, rule of thirds, organic scatter, tiled | `references/core-api.md` § Composition |
| **Interaction model** | Mouse follow, click spawn, drag, keyboard state, scroll-driven, mic input | `references/interaction.md` |
| **Blend modes** | `BLEND`, `ADD`, `MULTIPLY`, `SCREEN`, `DIFFERENCE`, `EXCLUSION`, `OVERLAY` | `references/color-systems.md` § Blend Modes |
| **Layering** | `createGraphics()` offscreen buffers, alpha compositing, masking | `references/core-api.md` § Offscreen Buffers |
| **Texture** | Perlin surface, stippling, hatching, halftone, pixel sorting | `references/visual-effects.md` § Texture Generation |

### Per-Project Variation Rules

Never use default configurations. For every project:
- **Custom color palette** — never raw `fill(255, 0, 0)`. Always a designed palette with 3-7 colors
- **Custom stroke weight vocabulary** — thin accents (0.5), medium structure (1-2), bold emphasis (3-5)
- **Background treatment** — never plain `background(0)` or `background(255)`. Always textured, gradient, or layered
- **Motion variety** — different speeds for different elements. Primary at 1x, secondary at 0.3x, ambient at 0.1x
- **At least one invented element** — a custom particle behavior, a novel noise application, a uniq