ue-mass-entity

Unreal Engine Mass Entity is an archetype-based Entity Component System (ECS) for high-performance simulation. You should use it to efficiently simulate thousands of entities by leveraging optimized data layout and parallel processing for large-scale game environments.

To create a custom fragment in Mass Entity, you define a new FMassFragment structure like FMyCustomFragment. This fragment represents a specific data slice for your entities, which processors then iterate over to execute simulation logic efficiently.

Processors (UMassProcessor) handle entity iteration for simulation logic, while observers (UMassObserverProcessor) react to specific entity events. Both enable efficient data processing and event handling within the archetype-based Mass Entity ECS architecture.

Yes, Mass Entity is designed for high-performance large-scale entity simulation. By leveraging its archetype-based ECS for optimized data layout and parallel processing, you can efficiently simulate thousands of AI characters in your game.

You manage the entity lifecycle and deferred mutations using the FMassEntityManager. This core manager handles entity creation, destruction, and safely schedules data changes to prevent race conditions during parallel processing.

Common pitfalls include inefficient data layout and improper parallel processing synchronization. Following best practices for fragment definitions, processor execution, and deferred mutations ensures optimal performance in large-scale entity simulations.