USD runtime loading, GlobalDefinitions error

Development Programming & Scripting C++
1

Having trouble loading USD files at runtime.

According to UE docs:
Universal Scene Description in Unreal Engine | Unreal Engine Documentation

I need to add this line to project.Target.cs:
GlobalDefinitions.Add(“FORCE_ANSI_ALLOCATOR=1”);

If I do this, I get the error:
Packaging (Mac): ERROR: project modifies the value of GlobalDefinitions. This is not allowed, as project has build products in common with UE4Game.

Elsewhere on the web it is suggested to also add:
BuildEnvironment = TargetBuildEnvironment.Unique;

However this results in error:
ERROR: Targets with a unique build environment cannot be built an installed engine.

Anybody have clues as to what is wrong and how to solve?
TIA

2

For any future people looking, the solve is to compile your own editor, and create the USD project (with recommended adjustments) from that editor.

3

Where did you find your project’s target.cs file? In the documentation, it mentioned it’s located at: UE_(version)\Engine\Source

When I look there, there’s only:

  • UE4Editor.Target.cs
  • UE4Game.Target.cs

I thought I actually found my target’s cs file in:
X:\Unreal5_Projects[project_name]\Intermediate\Source\

However it only appeared after the project was packaged, and if I modify it to add GlobalDefinitions.Add(“FORCE_ANSI_ALLOCATOR=1”); then it just automatically removes that line the next time the project is built.

Appreciate you findings on that it can be solved by compiling the editor, but does a solution exist yet without having to do so? The information on the Unreal Documentation seems incomplete or out of date.

4

I haven’t found a solution without having my own compiled editor.

Once you’re working with your own editor, the file to edit is:
[ProjectFolder]/Source/[Project].Target.cs

S