dots-update-groups

What problem does it solve?

It prevents ECS systems from running at the wrong time or frequency, which causes “value visible one frame late” bugs, physics jitter, and non-deterministic behavior between simulation and presentation.

Core Features & Use Cases

• Update-group selection by timing semantics: choose Initialization, Simulation, FixedStep Simulation, VariableRate Simulation, or Presentation based on whether work is input setup, simulation logic, deterministic physics/netcode, low-frequency ticking, or render-side reading.
• Intra-group peer ordering that actually works: use UpdateBefore/UpdateAfter only when both systems share the same group to establish correct reader/writer dependencies.
• Rate and timestep correctness: understand how SystemAPI.Time.DeltaTime meaning changes across groups so the same code doesn’t accidentally run with wall-clock instead of fixed timestep.

Quick Start

Use this skill when you add or reorder an ECS ISystem and need its update timing, ordering, and timestep behavior to remain deterministic across frames and fixed steps.