File name, specified as a character vector or a string scalar. The input file type must be a PLY or a PCD format file.

The polygon (PLY) file format , also known as the Stanford triangle format stores three-dimensional data from 3-D scanners. It is a format for storing graphical objects that are described as a collection of polygons. A PLY file consists of a header, followed by a list of vertices and then, a list of polygons. The header specifies how many vertices and polygons are in the file. It also states what properties are associated with each vertex, such as (x,y,z）坐标，正常和颜色。文件格式具有两个子形式：ASCII表示和一个用于紧凑存储以及快速节省和加载的二进制版本。ASCII和二进制文件的标题是ASCII文本。在两个版本之间，仅遵循标题的数字数据有所不同。看The PLY Formatfor details on the contents of a PLY file.

The point cloud data (PCD) file format also stores three-dimensional data. It was created by the authors of the widely used point cloud library (PCL) to accommodate additional point cloud data requirements. SeeThe PCD (Point Cloud Data) file format.