No rules, no squares - STL digital standard file analysis

The Warring States, Zou·Meng Biao, "Mencius, Lishang" has a cloud: "From the sin of the Ming, the ingeniousness of the public, not in the rules, can not be a square." Meaning to do anything must have certain rules, rules, practices, otherwise Unable to succeed. Today, 3D smart digitization and 3D printing enable the conversion of virtual 3D into entities, and the standard for achieving this is the STL file format.

The STL (StereoLithography) file format was invented in 1988 by Charles W. Hull, founder of 3D Systems, Inc., which was primarily aimed at SLA (Light Curing Stereo Forming) and is now the world's CAD/CAM system interface. The industry standard for file formats is the most common 3D file format supported by 3D printers .

 

â–³ Charles Hull

After saving the 3D model as an STL file, the surface contour shape of the object is converted into a triangular patch mesh. Each triangle describes its spatial position (x, y, z coordinates and normal vector).

â–³ triangle patch grid

There are two kinds of STL files: one is ASCII text format, which is characterized by good readability and can be read directly; the other is binary format, which is characterized by taking up less disk space and about 1/6 of ASCII text format, but Poor readability. But whether it is ASCII text format or binary format, the STL file format is very simple and clear at a glance.

The STL file format is simple, clear, easy to understand, easy to generate and split, and simple in algorithm. The output accuracy can also be easily controlled.

â–³ triangle patch grid

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