An engine that lets your agent render video, 3D and games as React

What it does

raea is a Rust rendering engine (built on Bevy and wgpu) where a composition is just a React component that draws a frame for a given moment. The same file can render to MP4, play live as a game, or emit a single PNG frame for an agent to inspect. It handles video and motion graphics, 3D scenes with glTF and Gaussian splats, sound with a shared mixer, and games with input and physics — all on your own GPU.

The interesting bit

The whole thing is designed around the agent loop: everything raea draws stays queryable as data, so an AI can render a frame, look at it, and fix what’s wrong without a human in the loop. raea check enforces a quality floor — clipped text, low contrast, unsafe areas, freezes, loudness — and raea cut slices footage by what’s said in it. The installer even drops agent skills into ~/.claude/skills so Claude Code knows how to use it out of the box.

Key highlights

• Compositions are React + TypeScript — the code your AI already writes well
• One file, four outputs: MP4 render, live game (raea play), single frame, or exported standalone game
• 3D via Bevy 0.20: cameras, lights, materials, glTF, Gaussian splats
• Runs fully offline; RAEA_OFFLINE=1 refuses all network access, and there’s no telemetry
• Ships with craft guides and Gherkin behaviour specs beside the code

Caveats

• Self-declared canary status: daily changes, breaking changes, rough edges, doc gaps
• Windows support is new and “least tested”; macOS and Linux are the solid targets
• FSL-1.1-ALv2 licence — free for everything except building a competing product, with each version going Apache-2.0 after two years

Verdict

Worth a look if you’re building agent-driven content pipelines and want renders checked by machine, not eyeballs. Skip it if you need a stable API — this one moves daily and says so.