What Is a Point Cloud?
The point data collection of the product appearance surface obtained by measuring instruments in reverse engineering is also called point cloud. Generally, the number of points obtained by using a 3D coordinate measuring machine is relatively small, and the distance between points is relatively large. It is called a sparse point cloud. ; And the point cloud obtained by using a three-dimensional laser scanner or a photographic scanner, the number of points is relatively large and dense, called a dense point cloud.
Point cloud
- A point cloud is a collection of massive points at the surface characteristics of the target.
- The point cloud obtained according to the laser measurement principle includes three-dimensional coordinates (XYZ) and laser reflection intensity (Intensity).
- The point cloud obtained according to the principle of photogrammetry includes three-dimensional coordinates (XYZ) and color information (RGB).
- The point cloud is obtained by combining the principles of laser measurement and photogrammetry, including three-dimensional coordinates (XYZ), laser reflection intensity (Intensity), and color information (RGB).
- After obtaining the spatial coordinates of each sampling point on the surface of the object, a point set is obtained, which is called a "point cloud".
- Point cloud format:; * .pts; * .asc; * .dat; * .stl; * .imw; * .xyz;
- Sparse point clouds or dense point clouds are the basis of reverse modeling. There are many specialized reverse softwares that can edit and process point clouds, such as
- When a laser beam hits the surface of an object, the reflected laser light will carry information such as orientation and distance. If the laser beam is scanned according to a certain trajectory, the reflected laser point information will be recorded while scanning. Since the scanning is extremely fine, a large number of laser points can be obtained, and a laser point cloud can be formed.