bevy-character-movement

使い方

インストールコマンドをコピーし、自分の環境へ導入する前にソースを確認します。
必要なツール、認証情報、対応環境を原文で確認します。
入力と成果物を指定し、出力を資料と照合します。

npx skills add https://github.com/thedivergentai/game-design-agentic-skills --skill bevy-character-movement

開始前の確認

導入にはモデル契約、API枠、ファイルへのアクセス許可は含まれません。
スター数や導入数は活動の指標であり、独立した品質・安全性試験ではありません。

リポジトリの原文

見出し、例、コード、表、リンク、参照画像を含む原文を表示しています。

Bevy character movement

When to use

Load this when a Bevy app needs a player or actor that moves in discrete steps (walk, jump feel, ground check) and you need the ECS shape before any solver code exists. Coyote time and a jump buffer are design notes. They are not a node port.

ECS shape

Components own pose and intent: position, velocity, and a jump-buffer or coyote timer as data. The Quick Start ECS page shows components as Rust structs that derive Component.
Resources own clocks and tuning shared by every mover. bevy::time 0.20.0 documents Time, Fixed (fixed timestep clock), and Virtual.
Systems read intent and write velocity or position. Register them on the fixed schedule, not on a per-node physics callback.
Schedule: run_fixed_main_schedule runs FixedMain from virtual time (bevy::time 0.20.0). Order dependent systems with .chain() (ECS page). Do not paste a Godot physics-process function.

Coming from Godot

Godot idea	Bevy idiom
Body that you move yourself	Entity with movement components and a system
Step that should stay stable when frame time changes	System on the fixed timestep (`Fixed` / `FixedMain`)
Coyote time, jump buffer	Timer data on the entity or a small resource, consumed by the movement system
Collision response	Collision response belongs on bevy-physics-3d.

Scope

Check the bevy 0.20.0 crate docs for a character-controller type before writing one. The feature list has no physics solver.
Do not call move_and_slide, _physics_process, or CharacterBody2D.
Ground detection, shape casts, and collision layers are unverified. Do not invent query APIs.

Expert Knowledge Delta

Target: Bevy 0.20+.

Core ECS types: Component, Resource, Query, Commands, Startup, Update, Fixed / FixedMain (bevy::time), .chain(), Plugin, DefaultPlugins, MinimalPlugins. Messages and observers are an ownership slot. See bevy-events-messaging for their APIs. Systems run in parallel unless .chain() orders the ones that conflict.

Who owns state

Piece	Owner	Who may mutate	Schedule
Data on one entity	`Component`	One system via `Query`	`Update` or `FixedMain`
One value for the whole app	`Resource`	One system	`Startup` to insert, then the schedule that reads it
Spawn	`Commands`	The spawning system	`Startup` for the initial world; later schedules for runtime spawn
Order that must not race	`.chain()`	The chained systems only	Same schedule
Plugin boundary	`Plugin`	`build` registers systems and resources	Before the app runs

Borrow rule: two systems that both mutably query the same component must be ordered (.chain()) or split so only one writes. Unrelated systems stay parallel. That is the ECS page rule, not a guess at a system-set API.

Decision

If you need	Do this	Do not
Per-entity data	`Component` + `Query`	A Godot node script
App-wide config or clock	`Resource`	Copy the value onto every entity
Stable simulation step	`FixedMain` and the `Fixed` clock	Tie simulation to raw frame `Update`
Startup spawn	`Commands` in `Startup`	Spawn from a render system
Cross-system notice that is not shared state	Message or observer slot in `bevy-events-messaging`	A new event type invented in this file
An API outside the documented set	Check the official docs first	A made-up crate or API

Load references/ecs-ownership.md for the ownership table.

NEVER

Do not pin /0.20.0/ in docs URLs. WHY: links stay on latest; the 0.20 target is stated once in prose.
Do not step locomotion on raw Update when the step must stay stable. WHY: bevy::time documents Fixed and run_fixed_main_schedule (FixedMain) for a fixed clock.
Do not call move_and_slide, _physics_process, or CharacterBody2D. WHY: those are Godot types. This skill only owns ECS movement data.
Do not invent a character-controller or shape-cast API. Check the bevy crate docs for a controller type before writing one.
Do not mutably query the same movement component from two unordered systems. WHY: systems run in parallel unless .chain() orders them.

Reference

docs.rs links use the unversioned latest permalink. The library pin on bevy-master stays 0.20.0.

Official Documentation

Migration guides - Unversioned hop index.
bevy crate - Unversioned API index.
Examples - Example tree on the latest branch.
Quick Start: ECS - Entities, Component, systems, Query, Commands, and .chain().
bevy::time - Time, Fixed, and run_fixed_main_schedule (FixedMain).

Related Skills

Prerequisites

bevy-master - ECS ownership, schedules, and which Bevy skill to load.

Complements

bevy-physics-3d - Collision and physics solvers. Player motion stays in this skill.
godot-characterbody-2d - Equivalent Godot skill. Do not import Godot types.

Downstream / consumers

Genre skills cover loop and encounter design.

Master

bevy-master - Bevy router.

使い方