Fio: 3D World editor/game engine – inspired by Radiant and Hammer

In plain words

Fio is a brush-based 3D world editor and game engine inspired by classic tools like Radiant and Hammer. It uses constructive solid geometry for level design with a unified forward renderer that supports real-time lighting and stencil shadows without requiring pre-baked compilation. The engine is designed to be compact and lightweight, targeting lower-end hardware like the Snapdragon 8CX while maintaining OpenGL 3.3 compatibility.

written from the facts on this page · September 2026

From the sources

A real-time liminal Quake/Hammer-style level editor with built-in game engine. Optimised for mobile CPUs * Build a level, hit play, and walk around instantly * Real-time lighting with stencil shadows * Unified Forward Renderer * Classic brush-based workflow * Fog, glass & water shaders * Entity I/O system (logic, triggers, lights, speakers) * Terrain generation * OBJ model support * Supports Quake-style nodraw surfaces * Fully modular and open source (MIT License)

Unified Liminal World Editor, Procedural Engine & Game Creation Toolkit inspired by Radiant and Hammer. Optimised for low-power CPUs. - ViciousSquid/Fio

Fio is a modern, instant-iteration take on classic CSG level editors Designed on low-power ARM hardware with an efficiency-first philosophy. An engine built for rapid experimentation. Fio explores a unified approach to level editing and runtime simulation: Persistent global key/value storage allows maps to influence later maps and enables branching narratives. git clone https://github.com/ViciousSquid/Fio.git cd Fio python -m venv venv source venv/bin/activate # or venv\Scripts\activate (Windows) pip install -r requirements.txt python main.py 🤝 Contributing Contributions, feedback, and experiments are welcome. Check issues or open a discussion. Unified Liminal World Editor, Procedural…from github.com

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  I'm open-sourcing my game engine2023 · github.com · ▲318

  Modd.io is a collaborative game editor that runs in browser. It's kind of like Figma for game dev. We made this engine low-code and multiplayer-first, so developeres can quickly prototype casual multiplayer games. I hope some of you guys will find this useful. Would love to hear feedback also. Thank you. Engine Demo: https://www.modd.io

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  A Marble Madness-inspired WebGL game we built for Netlify2024 · 5-million-devs.netlify.com · ▲616

  Hello HN! We’re a small creative studio specializing in real-time 3D experiences. Netlify approached us to design and build an interactive experience to celebrate reaching 5 million developers. Inspired by the classic game Marble Madness, we created a gamified experience where users control a ball through playful, interactive levels. The goal was to blend marketing content with the look and feel of a game to engage users. The app is built with Three.js [1], using our custom render pipeline and shaders, and uses Rapier for physics simulation [2]. The 2D content is overlaid on the WebGL view…

• UL
  Unity like game editor running in pure WASM2023 · raverie-us.github.io · ▲644

  In the wake of all the Unity nonsense, just wanted to toss the Raverie engine into this mix :) We’re building off a previous engine that we worked on for DigiPen Institute of Technology called the Zero Engine with a similar component based design architecture to Unity. Our engine had a unique feature called Spaces: separate worlds/levels that you can instantiate and run at the same time, which became super useful for creating UI overlays using only game objects, running multiple simulations, etc. The lighting and rendering engine is scriptable, and the default deferred rendering…

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  An ASCII 3D Rendering EngineJun 2026 · glyphcss.com · ▲211

  Render 3D models (OBJ, glTF, GLB, STL, .vox) as ASCII art — in the browser, in React or Vue, or straight in your terminal. A three.js-style API with no WebGL and no canvas: just text in a single <pre>.

• IB
  I built an indie, browser-based MMORPG2024 · alpha.reconquer.online · ▲340

  I've been working on an MMORPG that is now in alpha as a solo developer. Here are the major open source technologies that I use: Blender - 3D modeling software for creating the overall environment and every game object. I've gotten a lot of CC and Public Domain assets from https:&#x2F;&#x2F;poly.pizza GLTF - I export assets from blender to the GLTF asset format JSON - I write a JSON config for every game object that describes things like its name, its interactions, its collisions, etc. Node.js exporter - I iterate over the environment and every asset to create a scene hierarchy. I use…

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  2D Game engine and editor for Windows and Linux2022 · github.com · ▲121

  Hello HN, Just wanted to show this little 2D game engine that I've been working on for some time (around 2 years on the editor part, longer on some of the components). It's quite full featured but obviously this a project of such magnitude already that the work never really ends. That being said it's definitely already at a point where games can made and published. The editor runs natively on Windows and Linux using Qt5. The games can run on both Win and Linux as well as on WASM with WebGL. Feature wise there's a bunch of the stuff you'd expect. Audio, graphics, scripting,…

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