Explanation
LiDAR (Light Detection and Ranging) is a technology that uses laser pulses to precisely measure distances and map the surrounding environment in three dimensions. By calculating the time each pulse takes to bounce back, LiDAR creates detailed 3D point clouds. It is now embedded in consumer devices like iPhone Pro and iPad Pro, and is used for 3D scanning, AR enhancement, room-scale VR mapping, and realistic occlusion.
Real-world example
The sensor on the iPhone Pro that measures distances for AR placement, or the scanners on self-driving cars.
Practical applications
- Rapid 3D scanning: digitize a space or object in minutes
- Precise AR: better placement of virtual objects on real surfaces
- Automatic mapping: map a room for room-scale VR
- Realistic occlusion: virtual objects are correctly hidden by real objects
LiDAR vs other technologies
LiDAR (Light Detection And Ranging)
- Measures distance via laser time-of-flight
- Millimeter-level precision
- Works even in low-light conditions
Example: iPhone Pro, iPad Pro, select VR/AR headsets
Alternatives (depth cameras)
- Structured light (pattern projection)
- Stereo vision (dual cameras)
- Less precise but less expensive
Example: Kinect (structured light), Quest (stereo vision)
VR scenario
An architect scans an apartment with a LiDAR-equipped iPad Pro in 5 minutes. The 3D model is automatically generated. They can then virtually place the planned furniture in it, or import it into a VR experience for their client.
Why it matters in professional VR
- LiDAR democratizes 3D scanning: an iPhone is sufficient for simple use cases
- Significantly improves the quality of AR experiences
- A key technology for digital twins and mixed reality