Set up the project structure

Oct 13, 2025 by pinkandtrash.com 26 views

Introduction

Incorporating machine learning capabilities into your Unreal Engine 5 (UE5) project can be a game-changer. One popular library for building and deploying machine learning models is Libtorch, a C++ frontend for PyTorch. However, integrating Libtorch into UE5 can be a challenging task, especially for those new to both technologies. In this article, we will guide you through the process of including Libtorch in your UE5 project, addressing common errors and providing a step-by-step tutorial.

Prerequisites

Before we dive into the tutorial, make sure you have the following:

Unreal Engine 5: Download and install the latest version of UE5 from the official Epic Games website.
Libtorch: Download the Libtorch library from the official PyTorch website. You can choose between the pre-built binaries or build from source.
C++ knowledge: Familiarity with C++ is essential for this tutorial.
UE5 project: Create a new UE5 project or open an existing one.

Step 1: Setting up the UE5 Project

To include Libtorch in your UE5 project, you need to set up the project correctly. Follow these steps:

Create a new UE5 project: Open the UE5 launcher and create a new project. Choose the "Third-Person" template and select "C++" as the project type.
Set up the project structure: Create a new folder in your project directory called "Libtorch". This will be the root directory for your Libtorch files.
Create a new C++ class: In the UE5 editor, go to File > New C++ Class. Name the class "LibtorchWrapper" and select "Actor" as the parent class.

Step 2: Installing Libtorch

Now that you have set up your UE5 project, it's time to install Libtorch. Follow these steps:

Download the Libtorch library: Download the pre-built binaries or build from source. For this tutorial, we will use the pre-built binaries.
Extract the Libtorch library: Extract the downloaded archive to a folder on your computer.
Copy the Libtorch library: Copy the extracted Libtorch library to the "Libtorch" folder you created in Step 1.

Step 3: Configuring the UE5 Project

To include Libtorch in your UE5 project, you need to configure the project correctly. Follow these steps:

Add the Libtorch library to the project: In the UE5 editor, go to Edit > Project Settings > Modules. Click the "+" button and select "Add Module". Browse to the "Libtorch" folder and select the "libtorch.so" file (or "libtorch.dylib" on macOS).
Add the Libtorch include directory: In the UE5 editor, go to Edit > Project Settings > Modules. Click the "+" button and select "Add Module Include Directory". Browse to the "Libtorch" folder and select the "include" directory.
Add the Libtorch library to the linker: In the UE5 editor, go to Edit > Project Settings > Modules. Click the "+" button and select "Add Module Linker". Browse to the "Libtorch" folder and select the "libtorch.so" file (or "libtorch.dylib" on macOS).

Step 4: Writing the Libtorch Wrapper

Now that you have set up your UE5 project and installed Libtorch, it's time to write the Libtorch wrapper. Follow these steps:

Create a new C++ file: In the UE5 editor, go to File > New C++ File. Name the file "LibtorchWrapper.cpp".
Include the Libtorch header: In the "LibtorchWrapper.cpp" file, include the Libtorch header file: #include "torch/torch.h"
Create a new Libtorch model: In the "LibtorchWrapper.cpp" file, create a new Libtorch model: torch::nn::Module model;
Compile the Libtorch model: In the "LibtorchWrapper.cpp" file, compile the Libtorch model: model.compile(torch::optim::Adam(model.parameters(), 0.001));

Step 5: Using the Libtorch Wrapper

Now that you have written the Libtorch wrapper, it's time to use it in your UE5 project. Follow these steps:

Create a new C++ file: In the UE5 editor, go to File > New C++ File. Name the file "MyActor.cpp".
Include the Libtorch wrapper: In the "MyActor.cpp" file, include the Libtorch wrapper: #include "LibtorchWrapper.h"
Create a new instance of the Libtorch wrapper: In the "MyActor.cpp" file, create a new instance of the Libtorch wrapper: LibtorchWrapper* wrapper = new LibtorchWrapper();
Use the Libtorch wrapper: In the "MyActor.cpp" file, use the Libtorch wrapper: wrapper->forward(torch::Tensor());

Conclusion

In this article, we have guided you through the process of including Libtorch in your Unreal Engine 5 project. We have covered the prerequisites, set up the UE5 project, installed Libtorch, configured the UE5 project, written the Libtorch wrapper, and used the Libtorch wrapper in your UE5 project. With this tutorial, you should now be able to include Libtorch in your UE5 project and start building machine learning models.

Common Errors

When including Libtorch in your UE5 project, you may encounter the following common errors:

Error LNK2019: This error occurs when the linker cannot find the Libtorch library. Make sure you have added the Libtorch library to the linker in Step 3.
Error LNK2001: This error occurs when the linker cannot find a symbol in the Libtorch library. Make sure you have included the correct header file in Step 4.
Error LNK1104: This error occurs when the linker cannot find a file in the Libtorch library. Make sure you have copied the correct file to the "Libtorch" folder in Step 2.

Troubleshooting

If you encounter any errors during the process, follow these troubleshooting steps:

Check the UE5 project settings: Make sure you have set up the UE5 project correctly in Step 1.
Check the Libtorch installation: Make sure you have installed Libtorch correctly in Step 2.
Check the Libtorch wrapper: Make sure you have written the Libtorch wrapper correctly in Step 4.
Check the UE5 project logs: Check the UE5 project logs for any error messages.

Frequently Asked Questions

In this article, we will answer some of the most frequently asked questions about including Libtorch in Unreal Engine 5.

Q: What is Libtorch?

A: Libtorch is a C++ frontend for PyTorch, a popular machine learning library. It allows developers to build and deploy machine learning models in C++.

Q: Why include Libtorch in Unreal Engine 5?

A: Including Libtorch in Unreal Engine 5 allows developers to build and deploy machine learning models in their games and simulations. This can be used for a variety of tasks, such as:

Game AI: Libtorch can be used to build and deploy game AI models, such as pathfinding and decision-making algorithms.
Simulation: Libtorch can be used to build and deploy simulation models, such as physics and dynamics simulations.
Computer Vision: Libtorch can be used to build and deploy computer vision models, such as image recognition and object detection.

Q: How do I include Libtorch in Unreal Engine 5?

A: To include Libtorch in Unreal Engine 5, follow the steps outlined in our previous article: How to Include Libtorch in Unreal Engine 5.

Q: What are the system requirements for including Libtorch in Unreal Engine 5?

A: The system requirements for including Libtorch in Unreal Engine 5 are:

Operating System: Windows 10 or later, macOS High Sierra or later, or Linux Ubuntu 18.04 or later.
CPU: Intel Core i5 or AMD equivalent.
Memory: 8 GB RAM or more.
Graphics: NVIDIA GeForce GTX 1060 or AMD equivalent.

Q: Can I use Libtorch with other Unreal Engine 5 features?

A: Yes, you can use Libtorch with other Unreal Engine 5 features, such as:

Blueprints: Libtorch can be used with Blueprints, a visual scripting system in Unreal Engine 5.
C++: Libtorch can be used with C++, a programming language in Unreal Engine 5.
Visual Scripting: Libtorch can be used with Visual Scripting, a visual scripting system in Unreal Engine 5.

Q: How do I troubleshoot issues with Libtorch in Unreal Engine 5?

A: To troubleshoot issues with Libtorch in Unreal Engine 5, follow these steps:

Check the UE5 project settings: Make sure you have set up the UE5 project correctly.
Check the Libtorch installation: Make sure you have installed Libtorch correctly.
Check the Libtorch wrapper: Make sure you have written the Libtorch wrapper correctly.
Check the UE5 project logs: Check the UE5 project logs for any error messages.

Q: Can I use Libtorch with other machine learning libraries?

A: Yes, you can use Libtorch with other machine learning libraries, such as:

TensorFlow: Libtorch can be used with TensorFlow, a popular machine learning library.
Keras: Libtorch can be used with Keras, a popular machine learning library.
PyTorch: Libtorch is a C++ frontend for PyTorch, so it can be used with PyTorch.

Q: How do I get started with Libtorch in Unreal Engine 5?

A: To get started with Libtorch in Unreal Engine 5, follow these steps:

Read the documentation: Read the Libtorch documentation to learn more about the library.
Watch tutorials: Watch tutorials on YouTube or other video platforms to learn more about using Libtorch in Unreal Engine 5.
Join the community: Join the Libtorch community on GitHub or other platforms to connect with other developers and get help with any issues you may encounter.

By following these steps and troubleshooting guide, you should be able to include Libtorch in your Unreal Engine 5 project and start building machine learning models.