How does a 3D scanner gather data from an object?

A 3D scanner gathers data from an object primarily by shining a laser and recording measurements. This method leverages laser triangulation or time-of-flight techniques to capture the precise dimensions and surface details of the object. When a laser beam is emitted towards the object's surface, it reflects back to the scanner, which can calculate the distance based on the time taken for the light to return or the angle at which it reflects. This data can then be processed to create a detailed 3D model, including various surface textures and contours.

Photographing the object does not typically allow for the accurate measurement of depth or the intricate details required for creating a 3D model. Infrared sensors can be used in some 3D scanning technologies but are not the primary mechanism for most scanners. Manual measurement, while it can provide dimensions, is impractical for capturing the complex and nuanced details of three-dimensional shapes efficiently. Thus, the use of lasers is the most effective and common method in modern 3D scanning technology.