A real-time Quake/Hammer-style level editor with built-in game engine

• For rapid block-out, logic wiring, and gameplay testing.
• Built because modern tools lost the immediacy of Radiant/Worldcraft

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Download for Windows and MacOS | Quickstart guide

Linux users are invited to use the included Dockerfile

• Build a level, hit play, and walk around instantly — no compile or lightmap baking
• Compact and lightweight (target: Snapdragon 8CX, OpenGL 3.3)
• Dockable UI for multi monitor workflow
• Real-time lighting with stencil shadows
• Unified Forward Renderer
• Classic brush-based workflow
• Fog, glass & water shaders with configurable surface parms
• Entity I/O system inspired by Half-Life 2 (logic, triggers, lights, speakers)
• Visual scripting (with 25 examples)
• Terrain generation
• OBJ model support
• Monsters/NPCs (actively being worked on)
• JSON level format
• Supports Quake-style nodraw surfaces

🗎 Fully modular and open source (MIT License)

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🚀 Quickstart:

1. Clone and Enter the Directory:

git clone https://github.com/ViciousSquid/Fio.git
cd Fio

2. Setup Virtual Environment (Recommended)

python -m venv venv
# Windows:
venv\Scripts\activate
# macOS/Linux:
source venv/bin/activate

3. Install Dependencies:

pip install -r requirements.txt

4. Launch the Editor:

python main.py

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