---
license: agpl-3.0
language:
- en
tags:
- typescript
- simulation
- spacecraft
- physics
- three-js
- browser
- sdk
- zero-dependencies
- sovereign
- snapkitty
- flight-model
- telemetry
- guidance
- hardware
- javascript
task_categories:
- other
size_categories:
- n<1K
pretty_name: orbital-one — Browser Spacecraft Simulator + SDK
---
# orbital-one

**Browser spacecraft simulator and headless flight-model SDK.**

Launch from the pad, fly a two-stage ascent to orbit — or import the sim engine directly into your own project.

SnapKitty West / SNAPKITTYWEST — MIT License — 2026

---

## What It Is

A browser 3D spacecraft simulator built on Three.js + Vite, with a **zero-dependency TypeScript SDK** that exposes all 8 sim modules for headless use in Node, Deno, Bun, or any bundler.

```ts
import { createState } from './src/sim/state.js';
import { tick }        from './src/sim/physics.js';
import { telemetry }   from './src/sim/telemetry.js';

const s = createState();
for (let i = 0; i < 6000; i++) tick(s);  // 100 simulated seconds
console.log(telemetry(s).altitude);       // metres above surface
```

---

## Repository

```
orbital-one/
├── src/
│   ├── sim/
│   │   ├── state.ts        Mission state (vehicle, fuel, orbit elements)
│   │   ├── physics.ts      Tick-based physics integrator
│   │   ├── guidance.ts     Ascent + orbital guidance laws
│   │   ├── navigation.ts   Inertial navigation system
│   │   ├── propulsion.ts   Engine model (thrust, Isp, staging)
│   │   ├── mission.ts      Mission sequencer (pre-launch → orbit → coast)
│   │   ├── telemetry.ts    Telemetry snapshot (altitude, velocity, apoapsis...)
│   │   └── math.ts         Orbital mechanics primitives (Kepler, RK4)
│   ├── render/world.ts     Three.js scene (planet, vehicle, trajectory trail)
│   ├── ui/
│   │   ├── cockpit.ts      Flight deck HUD
│   │   └── instruments.ts  Instrument panel (altitude tape, velocity, TWR)
│   ├── audio.ts            Engine audio (Web Audio API)
│   ├── input.ts            Keyboard + gamepad bindings
│   └── main.ts             App entry point
├── tests/
│   ├── flight.test.ts      Headless physics tests
│   ├── browser/flight.spec.ts  Playwright end-to-end
│   └── profile.ts          Performance profile harness
└── docs/verification.md    Simulation verification notes
```

---

## Sim Modules — SDK Reference

| Module | Export | Description |
|---|---|---|
| state | `createState()` | Fresh mission state |
| physics | `tick(state)` | Advance simulation 1/60 s |
| guidance | `guidanceUpdate(state)` | Pitch program + orbit insertion |
| navigation | `navUpdate(state)` | Inertial position/velocity |
| propulsion | `propulsionTick(state)` | Thrust, Isp, staging events |
| mission | `missionSequencer(state)` | Phase transitions |
| telemetry | `telemetry(state)` | Snapshot (altitude, velocity, apoapsis, etc.) |
| math | `keplerStep`, `rk4` | Orbital mechanics primitives |

All modules are zero-dependency TypeScript. `package.json` exports map wires every entry point.

---

## Quick Start

```sh
npm ci && npm run dev        # browser app → http://127.0.0.1:5173
npm test                     # headless physics tests
npm run test:browser         # Playwright (requires Chrome)
npm run build                # → dist/ (static, serve over HTTP)
```

Requires Node.js 22.12+.

---

## Stack

| Layer | Tool |
|---|---|
| 3D rendering | Three.js r180 |
| Bundler | Vite 7 |
| Language | TypeScript 5.9 |
| Tests | Vitest + Playwright |
| License | MIT |

---

## Related Repos

| Repo | Description |
|---|---|
| [SNAPKITTYWEST/sov](https://huggingface.co/datasets/SNAPKITTYWEST/sov) | Sovereign Package Switchboard |
| [SNAPKITTYWEST/mantra](https://huggingface.co/datasets/SNAPKITTYWEST/mantra) | Deterministic auditable language |
| [GitHub](https://github.com/SNAPKITTYWEST/orbital-one) | Source + CI |

---

## License

Licensed under **AGPL-3.0**. Full text: [LICENSE](LICENSE).

Releases published before 2026-10-07 were licensed under MIT; copies obtained under those terms keep them.

### 💼 Commercial License

SnapKitty code is free and open under **AGPL-3.0** for open-source use. Building a commercial product or service? A **proprietary commercial license** from Snapkitty Collective LLC lets you ship this code without the AGPL's source-sharing and network-use obligations.

**[→ Get a commercial license](mailto:A.parr@belespritdaccord.uk?subject=Commercial%20license:%20orbital-one)** · A.parr@belespritdaccord.uk