Async-Physics-Suspension-MT

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Async-Physics-Suspension-MT

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Fleet-ready vehicle physics plugin for UE5. Centralizes per-scene Chaos async sim, keeps the GT↔PT pipeline thread-safe, and runs per-vehicle steps in parallel via Chaos::PhysicsParallelFor(). Ships with debug counters and a tiny test UI.

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# Asynchronous vehicle physics in UE5 that scales with multithreading

![Unreal Engine](https://img.shields.io/badge/Unreal%20Engine-%23313131.svg?logo=unrealengine&logoColor=white)

I reworked the original [Async-Physics-Suspension](https://github.com/fgrenoville/Async-Physics-Suspension) project to simulate multiple vehicles in parallel, with a strict split between Game Thread (GT) and Physics Thread (PT) data to keep the plugin's workflow fully aligned with Unreal Engine 5 guidelines and best practices

Each vehicle owns its own input/output buffers and a PT-only internal state. All physics functionality now lives inside a dedicated plugin: SmokinWheelsPhx.

![CoverImage](https://raw.githubusercontent.com/fgrenoville/Async-Physics-Suspension-MT/main/GitHubAssets/UEProjectThmb.png)

## What’s in this repo

- The SmokinWheelsPhx plugin (per-scene Chaos management, GT ↔ PT buffers, per-vehicle parallel step).
- A sample project with a tiny UI to quickly test features and compare single-thread vs parallel performance.

## Architecture at a glance

- Per-scene ownership: one manager per FPhysScene; it registers GT hooks (ScenePreTick, ScenePostTick) and the PT sim callback (OnPreSimulate_Internal).
- GT↔PT contract: GT writes Input, PT writes Output—they exchange packets via lock-free queues. No UObjects on PT.
- Identity & handles: FGuid routes data across threads; FUniqueIdx correlates the rigid body in the solver; handles are cached and validated each step.
- Parallelism: one vehicle = one iteration; each iteration reads/writes only its own slot → lock-free inner loop.

Tip: If you’re GPU/Render-bound, parallel physics improves capacity and stability but may not increase FPS. Use Unreal Insights / stat unit to confirm where the bottleneck is.

![DemoImage](https://raw.githubusercontent.com/fgrenoville/Async-Physics-Suspension-MT/main/GitHubAssets/VehicleSpawnDestroy.gif)

![DemoImage](https://raw.githubusercontent.com/fgrenoville/Async-Physics-Suspension-MT/main/GitHubAssets/VehicleTweak.gif)

## Profiling & CVars

- Show plugin stats:
```text
stat SmokinWheelsPhx
```

![StatImage](https://raw.githubusercontent.com/fgrenoville/Async-Physics-Suspension-MT/main/GitHubAssets/StatThmb.png)

- Toggle single-thread execution:
```text
swp.ForceSingleThread true   // single-thread path
swp.ForceSingleThread false  // Chaos::PhysicsParallelFor
```
- Toggle debug drawing:
```text
swp.DebugDraw.Enable true
swp.DebugDraw.Enable false
```
- Change line thickness scale:
```text
swp.DebugDraw.ThicknessScale 0..N   // e.g., swp.DebugDraw.ThicknessScale 1.5
```
- Filter drawings by category:

The plugin can filter debug drawing by category. Currently only Suspension is used, but other categories are already defined (e.g., Engine, Aero, Transmission).
```text
swp.DebugDraw.Cats [Suspension, Engine, Aero...]
```

## 📖 Related Article

This project is explained in detail in my Medium article:

👉 [From one car to a fleet: asynchronous physics in UE5 that scales with multithreading](https://medium.com/gitconnected/from-one-car-to-a-fleet-asynchronous-physics-in-ue5-that-scales-with-multithreading-d322b2b94001)

If you want to dive into the theory behind integration and physics in game engines, check out the previous article here:

👉 [Tick by Tick: How Unreal Engine Simulates Real-World Physics](https://levelup.gitconnected.com/tick-by-tick-how-unreal-engine-simulates-real-world-physics-4ac7bc9ee5fb)

## 🔧 Requirements

- Unreal Engine 5.4+

- C++ toolchain set up

## Contributing

❤️ If you find this useful, consider starring the repo.

If you build something with it, drop a link — I’m happy to showcase community projects.

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