what is the principle of 3D scanner? what might be the cost of it?

Question

this is a surveying instrument.

Answer 1

A 3D scanner is a device that analyzes a real-world object or environment to collect data on its shape and possibly color. The collected data can then be used to construct digital, three dimensional models that are used in a wide variety of applications. These devices are used extensively by industry in the production of such things as movies and video games. Other applications include industrial design and prototyping, computer vision and documentation of cultural artifacts.

Two types of 3D scanners are contact and non-contact. Non-contact 3D scanners can be further divided into two main categories, active scanners and passive scanners. There are a variety of technologies that fall under each of these categories.

The purpose of a 3D scanner is usually to create a point cloud of geometric samples on the surface of the subject. These points can then be used to extrapolate the shape of the subject (a process called reconstruction). If color information is collected at each point, then the colors on the surface of the subject can also be determined.

3D scanners are very analogous to cameras. Like cameras, they have a cone-like field of view, and like cameras, they can only collect information about surfaces that are not obscured. While a camera collects color information about surfaces within its field of view, 3D scanners collect distance information about surfaces within its field of view.

Good quality 3D scanner will cost you $ 2495.
Pl. visit:
https://www.nextengine.com/indexSecure.htm

Answer 2

A simple surveying instrument is 2D. if you have one more at 90 degrees,and if you have two such instruments and if you plot the data from both and then combine them using classical engineering method, you can produce 3D drawing.

This is the principle of 3D scanner.

All this is done using computer so it is lots quicker.