Ambient occlusion is a 3D rendering technique that simulates ambient light occlusion by nearby surfaces, impacting 3D rendering by enhancing depth perception and realism through soft, natural shadows in crevices and tight spaces.
It works by calculating the indirect light reaching each point on a 3D model; areas surrounded by other objects receive less light, appearing darker, which mimics real-world light behavior.
It often pairs with global illumination to add subtle surface detail, preventing 3D models from looking flat and making them feel more grounded.
In complex scenes, adjusting ambient occlusion parameters can strengthen spatial relationships between objects, further boosting the scene’s believability.