When Epic Games released Unreal Engine 5 (UE5), it completely changed the landscape of 3D game development. Two of the most groundbreaking features are Nanite and Lumen.
Nanite is a virtualized geometry system that allows developers to import film-quality source art comprising millions of polygons directly into the engine. This means you no longer have to waste time baking normal maps or manually creating Level of Detail (LOD) models. The engine handles it dynamically without frame-rate drops.
Lumen, on the other hand, is a fully dynamic global illumination and reflections system. It reacts instantly to changes in the scene or light. If you blow a hole in a wall or change the time of day, Lumen adjusts the bounce lighting in real-time, eliminating the need for lightmap baking.
Together, these tools empower indie developers and AAA studios alike to create breathtaking, photorealistic environments faster than ever before.