entity-command-buffer

What problem does it solve?

Structural changes in Unity DOTS (like adding/removing components or instantiating/destroying entities) cannot be safely performed from within parallel jobs, so entities can end up in invalid states or cause runtime errors.

Core Features & Use Cases

• Record structural changes during jobs: Queue AddComponent, RemoveComponent, Instantiate, and DestroyEntity operations without performing them immediately.
• Play back at the correct frame boundary: Use the appropriate ECB system (e.g., BeginSimulationEntityCommandBufferSystem) so changes are applied safely on the main thread after simulation timing.
• Deterministic parallel playback: Use ECB.ParallelWriter with a proper sort key (chunk index) to ensure stable, predictable replay order across workers.

Quick Start

Ask your AI to show how to record entity instantiation and component setup inside a parallel IJobEntity using BeginSimulationEntityCommandBufferSystem and a chunk index sort key.