STL files contain no scale information, and the units are arbitrary. In the original specification, all STL coordinates were required to be positive numbers, but this restriction is no longer enforced and negative coordinates are commonly encountered in STL files today.
Binary files are more common, since they are more compact.Īn STL file describes a raw, unstructured triangulated surface by the unit normal and vertices (ordered by the right-hand rule) of the triangles using a three-dimensional Cartesian coordinate system. The STL format specifies both ASCII and binary representations. STL is a file format native to the stereolithography CAD software created by 3D Systems.STL has several backronyms such as “Standard Triangle Language” and “Standard Tessellation Language”.This file format is supported by many other software packages it is widely used for rapid prototyping, 3D printing and computer-aided manufacturing.STL files describe only the surface geometry of a three-dimensional object without any representation of color, texture or other common CAD model attributes.
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