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.
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
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 | Sovereign Package Switchboard |
| SNAPKITTYWEST/mantra | Deterministic auditable language |
| GitHub | Source + CI |
License
Licensed under AGPL-3.0. Full text: 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.