RealityKit ECS Systems

Quick Start

1. First verify that a documented RealityKit component cannot solve the problem; use realitykit-visionos-developer component selection when unsure.
2. Use a custom Component for per-entity state and a custom System for continuous or multi-entity behavior.
3. Register custom components and systems once during app startup before any scene, asset, or Reality Composer Pro content that depends on them loads.
4. Keep per-frame work in systems, not SwiftUI body code or ad hoc timers.
5. Load the full ECS guide only when implementing or debugging real custom ECS code.

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