3D scanning is the process of analyzing a real-world object, person or environment to collect data. A 3D scanning machine or 3D scanner will collect the shape and possibly appearance (like the color) of the subject. This data can then be used to get a 3D model, meaning a digital and three-dimensional object.
Generally, the accuracy of 3D scanners is within a range of 0.01 mm to 0.1 mm. It would be acceptable for most tasks to use a 3D scanner with an accuracy of 0.06-0.07 mm.
A 3D scanners are useful in applications where:
You rely on having accurate 3D measurements in making important decisions.
You need to capture vast amount of surface measurements quickly and efficiently.
Need to reconstruct a physical object in 3D to be visualize digitally on screen.