Architecture of bevyengine/bevy

Application code enters through the public library entry point in src/lib.rs, which exposes the apps, systems, components and assets that a program is built from. The crates directory holds the core work, with small Rust crates that each implement a focused part of the engine, such as ECS-facing primitives, camera and visibility behavior, and transform propagation. Rendering and scene code lives in files such as crates/bevy_scene/src/lib.rs and crates/bevy_pbr/src/render/light.rs, which handle extraction for rendering and UI before the running application produces output. The examples directory contains runnable programs that show how these parts are used together, and benches/src/lib.rs provides shared setup for the per-area benchmark programs. Cargo.toml files describe the packages that make up the project.

• crates: 1,343 files and 398,518 lines of code
• examples: 470 files and 83,391 lines of code
• benches: 106 files and 8,935 lines of code
• tools: 35 files and 2,739 lines of code
• tests: 11 files and 1,272 lines of code
• .github: 5 files and 148 lines of code
• errors: 1 file and 18 lines of code
• src: 1 file and 19 lines of code

By file count: Rust 1,961 files, Kotlin 4 files, JavaScript 2 files, Makefile 2 files, Shell 2 files, TypeScript 2 files.

Repowise documents bevy in 3,656 pages generated from the source, 104 of them written explanations of the repository and its modules. Module guides include:

• crates/bevy_animation/src: Animation Core Types
• crates/bevy_animation/macros/src: Animation Macros
• errors/src: Application Error Handling