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nexu-io/open-design/plugins/_official/examples/webgl-particle-galaxy/SKILL.md

webgl-particle-galaxy

A real-time particle galaxy — tens of thousands of additive-blended GPU points spiraling around a bright core, their orbits solved entirely in the vertex shader (from gl_VertexID), so the whole cloud draws in one call. Rendered as a single self-contained `index.html`. Use when the brief asks for a "particle field", "particle galaxy", "point cloud", "instanced points", "starfield", "GPU particles", or a swirling generative point system. Open Design serves this in powered-preview mode so the GPU s

Source repository stars
82,073
Declared platforms
0
Static risk flags
0
Last source update
2026-07-28
Source checked
2026-07-28
DecisionCompatibilityInstallWorkflowPermissionsEvidenceSource

Decision brief

What it does—and where it fits

Produce a single self-contained index.html that renders a real-time particle system full-screen, with a clean typographic overlay on top. The signature move: compute each particle's position on the GPU so the CPU never loops over particles.

Best for

  • Use when the brief asks for a "particle field", "particle galaxy", "point cloud", "instanced points", "starfield", "GPU particles", or a swirling generative point system.

Not for

  • Tasks that require unconfirmed production actions or broad system permissions.
  • Environments where the pinned source and install steps cannot be inspected.

Compatibility matrix

Platform support, with evidence labels

PlatformStatusEvidenceWhat to check
CodexNot declaredNo explicit evidencePortability before use
Claude CodeNot declaredNo explicit evidencePortability before use
CursorNot declaredNo explicit evidencePortability before use
Gemini CLINot declaredNo explicit evidencePortability before use
Open the compatibility checker

Installation

Inspect first. Install second.

The source command is displayed only when detected. A safe inspection prompt is always available so your agent can explain every action before execution.

Source-detected install commandSource
npx skills add https://github.com/nexu-io/open-design --skill "plugins/_official/examples/webgl-particle-galaxy"
Safe inspection promptEditorial

Inspect the Agent Skill "webgl-particle-galaxy" from https://github.com/nexu-io/open-design/blob/89d6d4ef21baf80f871595abdf6f7de6e941dd44/plugins/_official/examples/webgl-particle-galaxy/SKILL.md at commit 89d6d4ef21baf80f871595abdf6f7de6e941dd44. List every install step, command, network request, credential, file read/write, external action, and rollback step. Explain whether it fits my task. Do not install or execute anything until I approve.

Workflow

What the source asks the agent to do

  1. 01

    Workflow

    Read example.html end to end. Note the shape: no vertex buffer — the vertex shader reads glVertexID, hashes it into a stable per-particle seed, and derives a log-spiral orbit with an inner-fast rotation curve. Points are drawn with gl.drawArrays(gl.POINTS, 0, N) in one call, add…

    Spiral galaxy (default): log-spiral arms, rotation curve speed ≈ k / (r + ε), thin disk.Attractor / flow: curl or a strange-attractor step baked as a closed-form function of time.Explosion / reform: interpolate between a seeded start and a target shape on a looping clock.
  2. 02

    Step 0 — Read the reference

    Read example.html end to end. Note the shape: no vertex buffer — the vertex shader reads glVertexID, hashes it into a stable per-particle seed, and derives a log-spiral orbit with an inner-fast rotation curve. Points are drawn with gl.drawArrays(gl.POINTS, 0, N) in one call, add…

    Read example.html end to end. Note the shape: no vertex buffer — the vertex shader reads glVertexID, hashes it into a stable per-particle seed, and derives a log-spiral orbit with an inner-fast rotation curve. Points ar…
  3. 03

    Step 1 — Pick the motion

    Choose a field the vertex shader can express cheaply from glVertexID + uTime: - Spiral galaxy (default): log-spiral arms, rotation curve speed ≈ k / (r + ε), thin disk. - Attractor / flow: curl or a strange-attractor step baked as a closed-form function of time. - Explosion / re…

    Spiral galaxy (default): log-spiral arms, rotation curve speed ≈ k / (r + ε), thin disk.Attractor / flow: curl or a strange-attractor step baked as a closed-form function of time.Explosion / reform: interpolate between a seeded start and a target shape on a looping clock.
  4. 04

    Step 2 — Build index.html

    One file, zero external requests. Bind a VAO even with no attributes (some drivers require it).

    One file, zero external requests. Bind a VAO even with no attributes (some drivers require it).Point size in the vertex shader (glPointSize), clamped and DPR-aware; soft round sprites via glPointCoord + a gaussian falloff in the fragment shader.Additive blending on a dark clear color; premultiply the fragment color so blendFunc(ONE, ONE) reads as glow, not double-exposure.

Permission review

Static risk signals and limitations

No configured static risk pattern was detected

This is not proof of safety. Runtime behavior, indirect dependencies, and hidden external systems are outside the static scan.

Evidence record

Why each signal appears

EvidenceSourceComputedTestedEditorial
SignalValueEvidence typeMeaning
Quality score82/100ComputedDocumentation, specificity, maintenance, and trust rules
Repository stars82,073SourceRepository attention, not individual Skill quality
Compatibility0 platformsSourceDeclared in the catalog source record
Usage guideautomated source guideEditorialGenerated or reviewed according to the visible evidence level

Pinned source

Provenance and original SKILL.md

Repository
nexu-io/open-design
Skill path
plugins/_official/examples/webgl-particle-galaxy/SKILL.md
Commit
89d6d4ef21baf80f871595abdf6f7de6e941dd44
License
Apache-2.0
Collected
2026-07-28
Default branch
main
View the original SKILL.md

Particle Galaxy Skill

Produce a single self-contained index.html that renders a real-time particle system full-screen, with a clean typographic overlay on top. The signature move: compute each particle's position on the GPU so the CPU never loops over particles.

Why this is a powered artifact

Open Design detects getContext('webgl2') and renders this file in powered preview — a cross-origin-isolated iframe with allow-same-origin. The full GPU pipeline is available; you do not need to work around the opaque sandbox.

Resource map

webgl-particle-galaxy/
├── SKILL.md      ← you're reading this
└── example.html  ← a working 50,000-point WebGL2 galaxy (READ FIRST)

Workflow

Step 0 — Read the reference

Read example.html end to end. Note the shape: no vertex buffer — the vertex shader reads gl_VertexID, hashes it into a stable per-particle seed, and derives a log-spiral orbit with an inner-fast rotation curve. Points are drawn with gl.drawArrays(gl.POINTS, 0, N) in one call, additive-blended (blendFunc(ONE, ONE) with premultiplied color) so overlapping points glow.

Step 1 — Pick the motion

Choose a field the vertex shader can express cheaply from gl_VertexID + uTime:

  • Spiral galaxy (default): log-spiral arms, rotation curve speed ≈ k / (r + ε), thin disk.
  • Attractor / flow: curl or a strange-attractor step baked as a closed-form function of time.
  • Explosion / reform: interpolate between a seeded start and a target shape on a looping clock.

Step 2 — Build index.html

  • One file, zero external requests. Bind a VAO even with no attributes (some drivers require it).
  • Point size in the vertex shader (gl_PointSize), clamped and DPR-aware; soft round sprites via gl_PointCoord + a gaussian falloff in the fragment shader.
  • Additive blending on a dark clear color; premultiply the fragment color so blendFunc(ONE, ONE) reads as glow, not double-exposure.
  • Compile shaders with error logging (getShaderInfoLog / getProgramInfoLog) so a typo fails loudly.

Step 3 — Overlay + brand

  • Map the accent colors to the active DESIGN.md when one is present; otherwise a restrained dark palette with one vivid accent (the reference uses lime #63fe13 for the arms and a white-blue core).
  • Headline ≤ 15ch plus one supporting line. Never bury the particles behind the text.

Step 4 — Self-review (P0)

  • Renders continuously at ~60fps; the FPS badge updates.
  • Tens of thousands of points in a single draw call (no per-particle CPU loop).
  • No WebGL console errors; program links cleanly.
  • Resizes crisply on window resize (no stretching / blur).
  • Degrades to a message (not a blank page) if webgl2 is unavailable.

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