The Physical Assembly System is a purely blueprint-based, physics-driven assembly system that includes annotations in both Chinese and English. In this system, you can immerse yourself in a third-person perspective and connect various physical objects together. Regardless of how you assemble them, as long as there’s a reasonable way to provide power, you can add a driver’s seat and pilot them. Generally, the handling is quite satisfactory.
Additionally, the system provides gears, ropes, propellers, and other physical objects. The system also integrates the Unreal Engine’s water plugin and leverages its buoyancy system.

![Decay: Oil Drums District - [Rusty Industrial Slum] (5.1 – 5.7) 4 Decay: Oil Drums District - [Rusty Industrial Slum] (5.1 – 5.7)](https://www.psdly.co/wp-content/uploads/2026/04/Decay-Oil-Drums-District-Rusty-Industrial-Slum-5.1-–-5.7-350x250.jpg)




