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3d-sky-background

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Create a camera-correct sky background for a 3D scene with a procedural atmosphere or panorama, horizon haze, aligned sunlight, and coherent environment lighting. Use for architectural skies, outdoor 3D backgrounds, golden hour, and day-to-night sky transitions.

agent-skills/3d/3d-sky-background/SKILL.md

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# 3D Sky Background

Build a sky that surrounds the world, with a readable horizon and lighting that belongs to the same atmosphere.

## Choose the representation

Inspect the project's renderer, camera range, color pipeline, environment lighting, and existing assets. Use an existing licensed panorama when its cloud composition matters, a procedural sky when changing sun position matters, or a restrained hybrid. Keep the project's rendering backend and version; do not add a second renderer for the sky.

Keep three responsibilities explicit: the visible sky background, the reflection/ambient environment, and direct sun lighting. A background photograph alone does not light PBR objects. A PMREM environment does not supply a shadow-casting directional sun. See the [PMREM documentation](https://threejs.org/docs/pages/PMREMGenerator.html).

## Build a stable surrounding sky

- Use the engine's background facility, a fullscreen direction shader, or an inward-facing dome with depth writes disabled and fog disabled. A dome must fit inside the camera's clipping range and follow camera translation; it should retain world orientation as the camera rotates.
- Derive color from the normalized viewing direction. Blend a pale warm horizon through a muted middle band into a cooler zenith. Keep the lower hemisphere compatible with the ground haze rather than leaving an exposed hard edge.
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