This is my current method for importing and using .glb files in game engines. As I gain more experience with different engines, this workflow may evolve.

I don’t make games, but I check my models primarily for artifacts, UV issues etc. Here’s how I do it at the moment:

Godot (I follow these routines from the Godot community):

For importing glb: Godot 4: Importing 3D Models

For LOD settings: Godot 4 Automatic LOD Tutorial

Unreal 5 (options: import in Content Browser, or drag and drop, or use Import into Level):

Go to Content Browser, create a folder named Models

Hit Import and select your glb files

In the Import Content dialog, uncheck: Common Meshes → Build → Recompute Tangents, and

Static Meshes → Build → Build Nanite

Drag the mesh onto the level

NOTE: For NPCs, I have found that a completely different import method is required. More on that later — I am still working through the process. Unreal can be quite picky about how things are set up, which can be frustrating at times.

Unity 6:

Open Package Manager, click + and select Install Package by Name

Type in com.unity.cloud.gltfast and press Install

Create a folder called Models inside Assets

Drag your glb files into the folder pane, then drag onto the scene