build-usd-scene

Assemble or edit LunCoSim's 3D world: load scenes, spawn objects, place, move, rotate, scale, tune, or clear them. USE THIS SKILL for requests such as "put a lander near that crater", "spawn rovers", "load the Moon scene", "add rocks", "move this", "set its mass or material", or "build a scene with X and Y". For the agent mid-code: `LoadScene`, `SpawnEntity`, `MoveEntity`, `TransformEntity`, `SetObjectProperty`, a catalog `entry_id`, a `.usda` file, or a placement/ lighting issue. Project-specific: USD is the source of truth projected to ECS; use the fixed Y-up, right-handed, -Z-forward metre frame, root-qualified `lunco://` or `twin://` paths, and catalogued spawnables. Do not use `SetDocumentSource` for live edits. Use author-scenario for behavior and authoring-vessel-controllers for GNC. Use edit-usd-assembly for editing the reusable rover, lander, payload, or sensor assembly itself in a visible Editor session.

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Repositorio: LunCoSim/lunco-sim
Última actividad en el origen: 1 de septiembre de 2026 a las 12:21
Idioma detectado de SKILL.md: inglés
Estrellas: 104
Forks: 21

Opciones de instalación

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npx skills add https://github.com/LunCoSim/lunco-sim --skill build-usd-scene

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name

build-usd-scene

description

Build & edit USD scenes

The 3D world is OpenUSD, projected to Bevy ECS — USD is the source of truth, the ECS scene is its projection. You build the world by authoring USD (via commands that apply reversible ops), not by mutating ECS directly. Drive it over the API (--api, port 4101; launch per test-via-api).

Design background: 21-domain-usd.md, usd-source-of-truth.md.

This skill owns mounting and scene placement. For authoring the reusable assembly itself, switch to the interactive Assembly Editor runbook, which keeps a headful preview visible and routes every edit through the document/journal command boundary.

Before assembling a scene, choose its world/time contract. The complete option matrix is in ; the short version is below.

Scene contract	Author	Use it when
Fixed instructional world	A real `DistantLight` reference such as `lunco://lighting/sun.usda`, with an authored rotation; omit `LunCoEpochAPI` and `SolarSystem`.	Teaching UI, spawning, or basic controls where changing sunlight is not the subject.
Ephemeris world	Apply `LunCoEpochAPI`, author `double lunco:time:epochJd = …`, and reference `lunco://celestial/solar_system.usda` under `SolarSystem`; author the site anchor on the scene root when needed.	Teaching a real lunar day, Earth tracking, orbital motion, or any feature whose result depends on celestial time.
Existing world	Reference or payload the authoritative scene that already owns gravity, lighting, time, and celestial content.	Adding a lesson or assembly whose subject is behaviour, not scenery.
UI-only lesson	Omit the payload; the tutorial launcher clears an outgoing lesson scene before showing the UI-only lesson.	Teaching menus, commands, or workbench concepts.

Command	Params	Does
`LoadScene`	`{path, root_prim}`	Load a USD scene. `path` is a root-qualified `lunco://…` or `twin://…` address. `root_prim` empty = the stage's `defaultPrim`.
`ClearScene`	`{}`	Tear down the current scene.
`RestartScene`	`{}`	Reload/reset the current scene.
`SpawnEntity`	`{target, entry_id, position:[x,y,z], rotation?}`	Instance a catalogued prefab. `entry_id` comes from the spawn catalog (`list_bundled` / `ListBundled`).
`MoveEntity`	`{…}`	Reposition an existing entity.
`TransformEntity`	`{entity_id, translation, rotation}`	Set an existing entity's complete active-frame pose as one undoable USD edit.
`SetObjectProperty`	`{entity_id:u64, property, value}`	Set a named property (both strings; value is coerced by property type).
`SelectEntity`	`{…}`	Select (drives the gizmo/inspector).
`SetPorts`	`{target, writes:[[name,val]]}`	Poke an input port (e.g. drive a spawned rover) — see `author-scenario` for behaviour.

build-usd-scene

Opciones de instalación

Revisa los archivos de origen

Build & edit USD scenes

Build & edit USD scenes

Choose the scene's lighting and time model

The one coordinate frame (spec 009)

The command surface

Recipe

Gotchas

Anti-patterns

build-usd-scene

Datos de origen

Opciones de instalación

Revisa los archivos de origen

Más de este repositorio

Más de este repositorio

Build & edit USD scenes

Build & edit USD scenes

Choose the scene's lighting and time model

The one coordinate frame (spec 009)

The command surface

Recipe

Gotchas

Anti-patterns