Fio

Unified Liminal World Editor, Procedural Engine & Game Creation Toolkit inspired by Radiant and Hammer.

Fio is a modern, instant-iteration take on classic CSG level editors
Designed on low-power ARM hardware with an efficiency-first philosophy.

Key Features

• Hit "Play" instantly: no import, compile or bake step
• Edit and play in the same runtime
• Classic brush-based editing with arbitrary convex polyhedra
• Non-Euclidean portal connections between any two points in a level
• Generate fully playable procedural maps with two clicks
• Entity I/O logic system inspired by Source engine
• Local split-screen multiplayer
• Export projects as portable, self-contained packages
• A continuous camera system with first-person and top-down presets.
• Fully extendable via plugin API (example plugins included)
• Designed to bring back the immediacy of classic Radiant/Worldcraft workflows

Why Fio exists

An engine built for rapid experimentation. 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
• Enabling native non-Euclidean level design via world portals
• Persistent global key/value storage allows maps to influence later maps and enables branching narratives.

Official repo:  ViciousSquid/Fio