Zero-allocation actor pooling for Unreal Engine 5 via a World Subsystem.

Pre-spawn actors at level start, recycle them at runtime. No per-frame memory allocation, no GC spikes.

1. Clone or download this repo into your project's Plugins/ folder:

   cd YourProject/Plugins
   git clone https://github.com/NicholasGrigoriev/ActorPoolPlugin.git
   

2. Regenerate project files and build.

1. Create a Blueprint subclass of ActorsPoolWorldSubSystem (the C++ class is Abstract).
2. In the Blueprint's Class Defaults, assign a Pool Config data asset (ActorsPoolWorldConfig) that maps actor classes to pool sizes.
3. Register the Blueprint in Project Settings → Asset Manager → Primary Asset Types to Scan:
   • PrimaryAssetType: UActorsPoolWorldSubSystem
   • AssetBaseClass: your Blueprint class
   • bHasBlueprintClasses: True
   • SpecificAssets: path to your Blueprint
4. Use the pool in code or Blueprint:
   • SpawnActorFromPool — get an actor from the pool
   • ReturnActorToPool — return it when done
   • Optionally implement IObjectPoolInterface on your actor for spawn/despawn callbacks

• On level start, the subsystem reads the config and pre-spawns all actors (hidden, collision off, tick off)
• SpawnActorFromPool pops an actor from the inactive list, teleports it, and activates it
• ReturnActorToPool hides it and puts it back
• If the pool is empty, optionally falls back to regular spawning

MIT