What is occlusion culling, and how does it optimize 3D performance?

Occlusion culling is a 3D rendering optimization technique that identifies objects hidden by others and skips rendering them, reducing GPU workload to boost performance. It works by analyzing the scene from the camera’s perspective to detect occluded objects (blocked by foreground elements), thus avoiding unnecessary polygon/texture processing. Typical applications include 3D games (e.g., dense urban scenes), architectural visualization (indoor spaces with multiple rooms), and VR with complex overlapping objects. For 3D scenes with many overlapping elements, using occlusion culling tools (e.g., Unity, Unreal Engine) helps balance visual quality and frame rates.