Open Reality - a code first julia based game engine

sinisterMage
Sun, 15 Feb 2026 02:36:49 +0000
Tooling

Hi! I built OpenReality, a code-first game engine in Julia. I was inspired by RealityKit’s declarative API – you can build Vision Pro apps in ~20 lines of Swift. I wanted that elegance for games, but cross-platform and open source. Key features: - ECS architecture with immutable scene graph - 4 rendering backends (OpenGL, Metal, Vulkan, WebGPU) - Full PBR pipeline (deferred shading, CSM shadows, IBL) - Physics engine with GJK+EPA collision detection - Skeletal animation with glTF 2.0 support - 3D positional audio (OpenAL) - Exports to 400 KB WASM (vs Unity’s 200+ MB) Why Julia? Zero marshaling overhead. Unlike Unity (C#→C++) or Godot (GDScript→C++), there’s no FFI layer between your game code and the engine since they are both written in julia. Everything runs at native speed.
GitHub: GitHub - sinisterMage/Open-Reality: A Julia framework for building interactive 3D experiances
I’d love feedback on the architecture and API design. What features would make this useful for your projects?

13 posts - 4 participants