What does occlusion culling do in Unity?

• A. Hides objects not visible to the camera, reducing draw calls and improving frame rates.
• B. Forces all objects to render at higher resolution to improve detail.
• C. Enables dynamic shadows on all light sources.
• D. Precomputes lighting in lightmaps.

Answer: (A)

Occlusion culling hides objects that the camera can’t see because they’re blocked by other geometry, so Unity doesn’t waste time rendering them. This reduces draw calls and fill rate, which helps improve frame rates in complex scenes. It goes beyond frustum culling by specifically testing whether something is actually hidden behind other objects, not just whether it’s inside the camera’s view. In Unity, you typically bake occlusion data for static geometry (via the Occlusion Culling window) so the engine can skip those hidden items at runtime. It doesn’t change resolution, enable shadows on all lights, or precompute lighting in lightmaps.