# 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.

- **Type:** Skill
- **Install:** `agentstack add skill-scottstts-threejs-awesome-graphics-agent-skills-threejs-screen-space-ambient-occlusion`
- **Verified:** Yes — security-reviewed for prompt injection and unsafe behavior
- **Seller:** [scottstts](https://agentstack.voostack.com/s/scottstts)
- **Installs:** 0
- **Category:** [Agent Skills](https://agentstack.voostack.com/c/agent-skills)
- **Latest version:** 0.1.0
- **License:** MIT
- **Upstream author:** [scottstts](https://github.com/scottstts)
- **Source:** https://github.com/scottstts/Threejs-Awesome-Graphics-Agent-Skills/tree/main/skills/threejs-screen-space-ambient-occlusion

## Install

```sh
agentstack add skill-scottstts-threejs-awesome-graphics-agent-skills-threejs-screen-space-ambient-occlusion
```

Requires the [AgentStack CLI](https://agentstack.voostack.com/docs/cli). Works with Claude Code, Cursor, and any MCP-compatible agent.

## 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

1. Verify linear depth and view-space normals.
2. Reconstruct view position consistently.
3. Sample horizon visibility in a controlled radius.
4. Estimate AO and optional bent normal.
5. Denoise with depth/normal-aware filters.
6. 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](https://github.com/scottstts)
- **Source:** [scottstts/Threejs-Awesome-Graphics-Agent-Skills](https://github.com/scottstts/Threejs-Awesome-Graphics-Agent-Skills)
- **License:** MIT

Install and usage instructions live in the source repository linked above.

## Pricing

- **Free** — Free

## Security capabilities

Automated source analysis of v0.1.0 — what this tool can access:

- **Network access:** no
- **Filesystem access:** no
- **Shell / process execution:** no
- **Environment & secrets:** no
- **Dynamic code execution:** no

*"Yes" means the capability is present in the source — more access means more to trust, not that it is unsafe.*


## Versions

- **0.1.0** — security scan: passed — Imported from the upstream source.

## Links

- Listing page: https://agentstack.voostack.com/l/skill-scottstts-threejs-awesome-graphics-agent-skills-threejs-screen-space-ambient-occlusion
- Seller: https://agentstack.voostack.com/s/scottstts
- Browse the marketplace: https://agentstack.voostack.com/browse

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Listed on AgentStack — the marketplace for AI agent skills and MCP servers. Every listing is security-reviewed. Creators keep 70%.