Customizable Assembly Toolkit

Build machines from modular parts. Create, connect, simulate, control, and replicate interactive assemblies in Unreal Engine 5.7.

One toolkit, one assembly workflow

CAT turns authored Part Model and Assembly assets into a server-authoritative runtime assembly. The assembly is projected into Chaos physics, exposed through Blueprint-friendly runtime objects, and synchronized for multiplayer play.

Start here

• Follow Installation, then complete the Quick Start.
• Learn the terminology in Core Concepts.
• Create CAT assets in Assets and Authoring.
• Find Blueprint nodes in the API Reference.

Documentation sections

Overview

Understand what CAT provides, how authored assets become runtime state, and which requirements apply.

Getting Started

Install the plugin and simulate the first CAT Assembly Actor.

User Guides

Follow task-oriented workflows for authoring, interaction, controls, runtime assemblies, physics, networking, and save/load.

API Reference

Look up the public runtime objects, Actors, Components, Subsystems, extension points, and Blueprint libraries.