Key Features

• Edit and play in the same runtime
• Hit "play" instantly: no import, compile or bake step
• Generate fully playable procedural maps with one click
• Entity I/O logic system inspired by Source engine
• Classic brush-based CSG editing
• Export creations as self-contained packages
• Local split-screen multiplayer
• Designed to bring back the immediacy of classic Radiant/Worldcraft workflows

Fio explores a unified approach to level editing and runtime simulation:

• Reducing friction between authoring and execution

• Reintroducing brush/CSG-based workflows in a modern runtime

• Treating gameplay logic as a visible, editable system

• Supporting rapid experimental iteration in rendering and world design

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• 16 included example maps
• Monsters with node-based pathfinding
• Triggers, timers, and logic gates
• Procedural terrain and liminal level generators

• OpenGL 3.3 forward renderer
• Dynamic lighting, shadows, fog, glass and water
• Frustum culling
• World portals

• Python 3.10+ runtime
• NumPy used for batch numeric operations and scene updates
• Multi-threaded subsystems (render / simulation separation where applicable)
• Designed for CPU-bound performance on low-power hardware (ARM-class)
• Runtime state is shared between editor and engine layers; no serialization boundary during play mode

🗎 Modular architecture, fully open source (MIT License)

Python 3.10+ is required

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

Contributions, feedback, and experiments are welcome. Check issues or open a discussion.