Polygons are small triangles which define the 3D object. The centre image is an exported STL file with 28,560 polygons. The first image on the left below is an original CAD file. The STL format does not keep data about colour and texture. The STL file format only keeps the information about the surface geometry of a 3D object. However, it may also come from a 3D scanning device. What data does STL keep about a 3D object?Īn STL file is commonly made from exporting a model from CAD software. The normal determines the polygon's orientation, and it determines which side of the polygon is inside and outside. Each polygon consists of three vertices and one normal. STL stands for – StereolithographyĪn STL file shows the polygon base mesh of a 3D design. Lastly, we will look at industries applications for this file type. We will explore what data this file format keeps about a 3D object, furthermore the size of files in STL format, 3D printing with this file format. We will focus primarily on the STL file format. Some of the file formats names that we come across in the 3D printing industry are STL, OBJ and 3MF. In additive manufacturing, commonly known as 3D printing, we have multiple file formats, depending on the materials and machine type we use.
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