GoKawiilApple explains how iPhone's LiDAR sensor enables AR and better low-light photos
LiDAR on iPhone Pro models works by emitting light pulses and timing their return to measure distances to nearby surfaces, giving the device a sense of depth alongside camera imagery. Apple's ARKit uses this data to build a 3D mesh of a room's floors and walls, which apps like RoomPlan use to map furniture, doors and windows into a full 3D model. The sensor also boosts photography, enabling faster autofocus and Night mode portraits in dim lighting.