In the process of obtaining the point cloud, there is a leading tool, the 3D scanner.
The operation is based on the emission of a beam of laser light which falls on an element and bounces off the scanner calculating the distance to the point. The scanner has a mirror that rotates on a rotational axis on which laser light is emitted, which provides this beam of light.
Generally speaking, scanners used in public works can be classified into two groups: fixed and mobile or portable scanners such as the paracosm portable 3D scanner.
What are their advantages and disadvantages?
- Stationary: these are the first scanners to be used for the study of point clouds. These equipments have great precision given their millimeter deviation. The operation is the same as for fixed stations used in topography. The scanner is positioned and the scan is performed. Through strategically placed spheres, the relationship between one point and another can be established.
The scanner does not just take point measurements, some of them also have a camera that generates a 360-degree panoramic view, which allows a better understanding of the cloud. This also offers the possibility of having its points in color.
- Mobile: these scanners have appeared recently because of problems related to taking readings in areas that are difficult to access or unstable. Much smaller in size, their technology eliminates the need to put them down and move them all the way to scan.
Compared to stationary scanners, these scanners have an accuracy of about 2 or 3 cm but their field of use is much wider than that of the stationary scanner.
3D scanning: a cloud of information
Performing a 3D scan of a building already provides a lot of information with which to work. With a point cloud, you can study the flatness of elements such as floors or walls, have an exact reading of what exists and be able to measure it, or perform the reverse engineering or pass-through procedure. time
In these latter processes, the study of the point cloud offers the possibility of seeing how the study item has evolved towards external agents such as time in order to know the level of degradation. In the heritage conservation sector, this use is very comprehensive, since the scanning of the elements allows not only to develop and document these elements but also to study how the passage of time and the weather conditions have affected them.
On the other hand, in the field of industrial engineering, the use of this technology makes it possible to create documentation for the development and production of parts and equipment which do not have such documentation.
There are now many web platforms that offer the possibility of managing the A cloud of dots through the browser without the need to install specific programs. These platforms also allow viewing of information later added to the cloud, such as location or beacons.