Threejs Screen Space Ambient Occlusion
Implement a production GTAO path in Three.js. Use for half-resolution horizon sampling, reversed-depth reconstruction, bent-normal encoding, full-resolution bilateral reconstruction, environment-light application, contact grounding, and halo diagnosis.
Install
$ agentstack add skill-scottstts-threejs-awesome-graphics-agent-skills-threejs-screen-space-ambient-occlusion ✓ scanned · ✓ verified — works with Claude Code, Cursor, and more.
Security review
✓ PassedNo issues found. Passed automated security review. · v0.1.0 How review works →
- ✓ Prompt-injection patterns
- ✓ Secret / credential exfiltration
- ✓ Dangerous shell & filesystem operations
- ✓ Untrusted network calls
- ✓ Known-malicious package signatures
What it can access
- ✓ Network access No
- ✓ Filesystem access No
- ✓ Shell / process execution No
- ✓ Environment & secrets No
- ✓ Dynamic code execution No
From automated source analysis of v0.1.0. “Used” means the capability is present in the source — more access means more to trust, not that it’s unsafe.
About
Screen-Space Ambient Occlusion
AO estimates missing ambient visibility. It must modulate indirect lighting, not repaint all scene color with a dark multiply.
Workflow
- Verify linear depth and view-space normals.
- Reconstruct view position consistently.
- Sample horizon visibility in a controlled radius.
- Estimate AO and optional bent normal.
- Denoise with depth/normal-aware filters.
- Apply to indirect diffuse and environment response.
Read [references/gtao-bent-normal-pipeline.md](references/gtao-bent-normal-pipeline.md).
Failure conditions
- direct light and emission are darkened;
- radius is specified only in pixels;
- foreground silhouettes cast thick screen-space halos;
- depth discontinuities are blurred together;
- AO remains strong at distances where its world radius is subpixel;
- bent normals are treated as ordinary geometric normals;
- the implementation claims temporal accumulation even though this path has none.
Routing boundary
This skill owns GTAO gathering, bent normals, denoising, and AO application. Use $threejs-image-pipeline only when its depth/normal buffers or pass order must be coordinated with other image-space systems.
Source & license
This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.
- Author: scottstts
- Source: scottstts/Threejs-Awesome-Graphics-Agent-Skills
- License: MIT
Install and usage instructions live in the source repository linked above.
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Versions
- v0.1.0 Imported from the upstream source.