dots-spawning-patterns

What problem does it solve?

It solves slow or incorrect entity spawning in Unity DOTS by showing efficient, deterministic patterns that avoid common performance traps and runtime failures.

Core Features & Use Cases

• Batched main-thread spawning: Instantiate a prefab Entity in one call, write per-entity data afterward, and manage Allocator.Temp correctly for fast bursts.
• ECB-based job spawning: Spawn entities from parallel jobs using EntityCommandBuffer.ParallelWriter with [ChunkIndexInQuery], ensuring correct deferred playback.
• Deterministic randomness: Use Burst-friendly Unity.Mathematics.Random with seeded CreateFromIndex to keep replays and tests consistent.
• Safety via gating and guardrails: Apply RequireForUpdate<T> to prevent missing singletons, and follow anti-patterns to avoid invalid code paths.

What problem does it solve?

Guidance focuses on implementing spawners for enemy waves, projectile fire, particle-like ECS entities, and any “create N entities per frame (or burst)” systems that must stay performant and replay-stable.

Quick Start

Follow the main-thread or ECB job pattern in the guide to spawn your prefab Entity in batches while using Random.CreateFromIndex with a non-zero deterministic seed.