GECS Systems in Godot 4.3+

Implement game logic in GECS v9 systems. Systems query matching archetypes and iterate through entities using fast Structure-of-Arrays (SoA) column access. All structural mutations (adding/removing entities or components) are deferred through cmd: CommandBuffer to ensure zero-copy iteration safety.

Addon: GECS · version v9 · Godot 4.3+ · MIT
Related skills: gecs-core for setup, gecs-queries for complex query filtering, gecs-performance for optimization benchmarks.

1. System Anatomy

A system inherits from System (Node).

class_name SimpleMovementSystem
extends System