What are the uses of a atlases 3D model for Unreal?

In Unreal Engine, atlases 3D models (3D assets with combined texture atlases) are mainly used to optimize performance by reducing draw calls and texture memory usage. They consolidate multiple textures into one file, so Unreal renders models faster—key for large scenes like open-world games, virtual film sets, or architectural visualizations with many visible assets. For projects with repeated assets (e.g., forest trees, office furniture), merging small textures into an atlas (via tools like Substance Painter) simplifies management and boosts frame rates.