How to import unreal engine?

Beginner Questions
1

I’m trying to use ITK to read dcm files from Unreal Engine.

After cmake, I built AllBuild in release mode. I then built the Insertall project and added it to the directory where the Unreal project is located.
The cmake setting modified CMAKE_INSTALL_PREFIX to copy files anywhere you wanted when building an Install project.
I think the header and lib files have all been added normally.

However, when I build an Unreal project, you get the following error.

[Error]
D:\ITKPluginTest\ExternalLib\ITK\Build\include\ITK-6.0\itkeigen\Eigen\src\Core\util\Memory.h(153): error C3861: ‘assert’: identifier not found

D:\ITKPluginTest\ExternalLib\ITK\Build\include\ITK-6.0\itkeigen\Eigen\src\Core\util\Memory.h(220): error C3861: ‘assert’: identifier not found

D:\ITKPluginTest\ExternalLib\ITK\Build\include\ITK-6.0\itkeigen\Eigen\src\Core\MathFunctions.h(1361): error C3861: ‘assert’: identifier not found

======================================

Does anyone know why that error is happening and how to fix it?

The development environment is as follows.
Window10
Visual Studio 2022

2

assert is defined in header <cassert>. Maybe that include is missing somewhere? More likely there is something wrong with your build system.

3

Thank you for your help.

I don’t think the file is missing because there was no problem when I only built ITK itself.

An error occurred in the eigen_assert macro when looking at the code where the error occurred.

Unreal Engine is also using Eigen, is there any chance of crashing if I library ITK?

4

If so, I suggest turning on ITK_USE_SYSTEM_EIGEN, then setting EIGEN_DIR to the same one Unreal uses. It will probably not matter for crashing, as you are not trying to transfer some eigen classes between ITK and Unreal libraries.

5

It took a long time to solve this problem.
As a result, integrating it into Unreal as the original code of ITK was problematic, so I quit.
It was confirmed that if some functions did not return the address when giving the return value, the value would not be received normally when crossing the dll.
I would like to know if there are any corrections or future plans regarding these issues.

Thank you.

6

I am afraid mixing different versions of the same library is a general problem, and not specific to ITK or Eigen.