Flint

Flint is a 3D game engine written from scratch in Rust, and the foundation under a small family of games: a raft at sea, a clockwork platformer, a rhythm game, two racers, a Doom-style shooter and more. Its worlds are plain text. A scene is a TOML file that reads almost like a list (a sun this bright, a sea this rough, a raft right here), so a person, a small program or an AI assistant can read one, change it, and render it to a picture in seconds to check the result. That loop of write, render, look is the heart of the engine.

Project page: chaps.dev/projects/flint has a reel of every world that runs on Flint, a clip of one line of a scene file turning sunset into night, and a frame of FlintLeap peeled back layer by layer.

Play it in the browser: play.chaps.dev runs Flint games on WebAssembly and WebGPU, with no install.

Running it

You need a stable Rust toolchain. On Windows that is all; Android and the web need the extra targets described in the documentation.

cargo build --release
cargo run --bin flint -- play demo/phase4_runtime.scene.toml   # play a demo scene
cargo run --bin flint -- render demo/phase4_runtime.scene.toml --output shot.png --schemas schemas
cargo run --bin flint -- edit demo/phase4_runtime.scene.toml    # scene viewer with live inspector
cargo test

flint init starts a new game, which carries the engine inside it as a git subtree at engine/ and layers its own schemas over the engine's (--schemas engine/schemas --schemas schemas). That is how every game in the family is built.

To run the web player locally (see docs/design/web.md):

rustup target add wasm32-unknown-unknown
cd crates/flint-player
trunk serve

Layout

• crates/ holds the 26-crate workspace: the flint CLI, flint-player, the wgpu renderer, Rapier physics, Kira audio, Rhai scripting, animation, particles, terrain, the query language and the editors
• schemas/ defines the engine's components and archetypes in TOML
• demo/ has showcase scenes, scripts and effects
• docs/book/ is the mdBook source for docs.chaps.dev/flint
• tools/ holds the docs checker, the play.chaps.dev site builder and other helpers