Controlling Virtual Lights in Unreal Engine via OSC from TouchDesigner

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Unreal Engine, well known for its association with video games including the Unreal series (for which it was named) and more recently Fortnite, has been gaining popularity as a tool for virtual production, interactive/immersive projects and realistic real-time rendering.

Many developers augment their TouchDesigner projects with Unreal to take advantage of the 3D capabilities Unreal offers, while working with TouchDesigner for its ability to quickly prototype, Python integration, and connect to a wide variety of devices and protocols. As both Unreal and TouchDesigner support OSC messaging, it’s a common tool to use for sending control information and data from one software to the other.

In this tutorial, Jack DiLaura walks you through setting up a simple OSC-based connection between TouchDesigner and Unreal Engine, allowing you to control the overhead lights of a highly detailed model of a subway car rendered in Unreal with CHOP signals from TouchDesigner. You’ll learn how to set up basic functionality within Unreal Engine to receive OSC messages, parse their addresses, and route the content to parameters of the objects within your scene.

Chapters:
00:00:00 - Unreal Engine download and Epic Games Marketplace
00:04:21 - Setting up the TouchDesigner Network
00:07:39 - Setting up the Unreal Engine Project
00:10:36 - OSC Receiver in Unreal Engine
00:15:56 - OSC Server
00:22:08 - Testing the OSC connection
00:27:59 - Routing Messages to the Intensity Level of Lighting
00:33:57 - Adjusting the Lighting Intensity
00:40:01 - Rebuilding Lighting Effects
00:45:31 - Generating RGB Values and Setting Light Color
00:51:00 - More TouchDesigner and Immersive Content