Best for
- Use when the brief asks for a "raymarch", "signed distance field", "SDF", "3D hero", "metaballs", "blobs", or a shader-based 3D scene.
Source profileQuality 77/100
nexu-io/open-design/plugins/_official/examples/webgl-raymarched-hero/SKILL.md
webgl-raymarched-hero
A real-time raymarched 3D hero — soft-shadowed morphing metaballs with a fresnel rim light, sphere-traced per pixel in a fragment shader with a slow camera orbit. No meshes, no textures. Rendered as a single self-contained `index.html`. Use when the brief asks for a "raymarch", "signed distance field", "SDF", "3D hero", "metaballs", "blobs", or a shader-based 3D scene. Open Design serves this in powered-preview mode so the GPU stack actually runs.
- Source repository stars
- 82,073
- Declared platforms
- 0
- Static risk flags
- 0
- Last source update
- 2026-07-28
- Source checked
- 2026-07-28
Decision brief
What it does—and where it fits
Produce a single self-contained index.html that renders a real-time 3D scene entirely in a fragment shader via sphere tracing, full-screen, with a clean typographic overlay on top.
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
| Platform | Status | Evidence | What to check |
|---|---|---|---|
| Codex | Not declared | No explicit evidence | Portability before use |
| Claude Code | Not declared | No explicit evidence | Portability before use |
| Cursor | Not declared | No explicit evidence | Portability before use |
| Gemini CLI | Not declared | No explicit evidence | Portability before use |
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-raymarched-hero"Safe inspection promptEditorial
Inspect the Agent Skill "webgl-raymarched-hero" from https://github.com/nexu-io/open-design/blob/89d6d4ef21baf80f871595abdf6f7de6e941dd44/plugins/_official/examples/webgl-raymarched-hero/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
- 01
Workflow
Read example.html end to end. Note the shape: one fullscreen triangle; a map(p) signed-distance function that smooth-unions (smin) several moving spheres; normals by finite differences; a softShadow march; and a camera built from ro/ta with a slow orbit. Shading = diffuse × soft…
Metaballs (default): a few spheres blended with smin — organic, always readable.Rounded primitives: box/torus/capsule SDFs with domain repetition for a structured hero.Displaced surface: a sphere plus a low-amplitude noise displacement for a molten look. - 02
Step 0 — Read the reference
Read example.html end to end. Note the shape: one fullscreen triangle; a map(p) signed-distance function that smooth-unions (smin) several moving spheres; normals by finite differences; a softShadow march; and a camera built from ro/ta with a slow orbit. Shading = diffuse × soft…
Read example.html end to end. Note the shape: one fullscreen triangle; a map(p) signed-distance function that smooth-unions (smin) several moving spheres; normals by finite differences; a softShadow march; and a camera… - 03
Step 1 — Choose the SDF
Keep the marcher cheap so it holds 60fps: - Metaballs (default): a few spheres blended with smin — organic, always readable. - Rounded primitives: box/torus/capsule SDFs with domain repetition for a structured hero. - Displaced surface: a sphere plus a low-amplitude noise displa…
Metaballs (default): a few spheres blended with smin — organic, always readable.Rounded primitives: box/torus/capsule SDFs with domain repetition for a structured hero.Displaced surface: a sphere plus a low-amplitude noise displacement for a molten look. - 04
Step 2 — Build index.html
One file, zero external requests. Fullscreen triangle + fragment raymarch.
One file, zero external requests. Fullscreen triangle + fragment raymarch.Bound the march: cap iterations (90), early-out on hit (d < 0.001) and on far distance; clamp DPR to 1.5 — raymarching is per-pixel heavy.Light it: diffuse, a soft/penumbra shadow, a fresnel rim (pow(1 - dot(n,-rd), 3)), and one specular lobe. Gentle gamma at the end.
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
| Signal | Value | Evidence type | Meaning |
|---|---|---|---|
| Quality score | 77/100 | Computed | Documentation, specificity, maintenance, and trust rules |
| Repository stars | 82,073 | Source | Repository attention, not individual Skill quality |
| Compatibility | 0 platforms | Source | Declared in the catalog source record |
| Usage guide | automated source guide | Editorial | Generated 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-raymarched-hero/SKILL.md
- Commit
- 89d6d4ef21baf80f871595abdf6f7de6e941dd44
- License
- Apache-2.0
- Collected
- 2026-07-28
- Default branch
- main
View the original SKILL.md
Raymarched Hero Skill
Produce a single self-contained index.html that renders a real-time 3D scene entirely in a fragment shader via sphere tracing, full-screen, with a clean typographic overlay on top.
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-raymarched-hero/
├── SKILL.md ← you're reading this
└── example.html ← a working SDF metaball raymarcher (READ FIRST)
Workflow
Step 0 — Read the reference
Read example.html end to end. Note the shape: one fullscreen triangle; a map(p) signed-distance function that smooth-unions (smin) several moving spheres; normals by finite differences; a softShadow march; and a camera built from ro/ta with a slow orbit. Shading = diffuse × soft shadow + fresnel rim + a tight specular.
Step 1 — Choose the SDF
Keep the marcher cheap so it holds 60fps:
- Metaballs (default): a few spheres blended with
smin— organic, always readable. - Rounded primitives: box/torus/capsule SDFs with domain repetition for a structured hero.
- Displaced surface: a sphere plus a low-amplitude noise displacement for a molten look.
Step 2 — Build index.html
- One file, zero external requests. Fullscreen triangle + fragment raymarch.
- Bound the march: cap iterations (~90), early-out on hit (
d < 0.001) and on far distance; clamp DPR to ~1.5 — raymarching is per-pixel heavy. - Light it: diffuse, a soft/penumbra shadow, a fresnel rim (
pow(1 - dot(n,-rd), 3)), and one specular lobe. Gentle gamma at the end. - Compile shaders with error logging so a typo fails loudly, not silently black.
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 tints the surface toward lime
#63fe13and rims it in teal). - Headline ≤ 13ch plus one supporting line. Keep the 3D form as the hero.
Step 4 — Self-review (P0)
- Renders continuously at ~60fps; the FPS badge updates.
- Surface has real depth cues: shadow, rim, and a moving specular.
- No banding artifacts at the silhouette; normals are stable.
- Resizes crisply on window resize (no stretching / blur).
- Degrades to a message (not a blank page) if
webgl2is unavailable.
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