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Deterministic prediction-rollback netcode library for Unity.

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nilpunch/unity-prediction-rollback

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unity-prediction-rollback

Important

There is a much simpler and more reliable solution for prediction-rollback - Masssive ECS


It was an interesting experiment, but there are many problems with it. So, DO NOT USE IN PRODUCTION!.

Deterministic prediction-rollback netcode library for fast-paced games.
Library does not reference Unity Engine, so it could be used in a regular C# project.
P.S. currently, only samples references Unity Engine.

Goals

  1. Responsive controls with no delay
  2. Unlimited session length with late-joins
  3. Easy client-side coding with Unity (no ECS)
  4. Clean and simple OOP architecture
  5. Cross-platform determinism

Overview

This is a library, not a framework. Thus, the user controls everything that happens.

Implemented features:

  1. Prediction-rollback with zero GC allocations
  2. Live command timeline - make changes in the past and see immediate effect upon the future
  3. Distributed simulation - killer feature, allowing for many great things
  4. Algorithmic command prediction
    • Input replication
    • Input decay (fading out)
  5. Snapshots memory recycling on demand
  6. Replays with command history

TODO:

  1. Commands serialization
  2. State serialization for late-joins
  3. Actual networking

Recent progress

Here is some simple shooter with prediction-rollback features.

Input prediction sample. When there is no input from the player, the movement is fading out, and the shooting repeates in the last direction.

movie_017.mp4

Live simulation replay sample.

movie_013.mp4

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Deterministic prediction-rollback netcode library for Unity.

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MIT, Unknown licenses found

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