However, most software tools that support STL support both variants. In practice, binary STL files are more common, since they are more compact. See STL_ASCII and STL_binary for information appying only to one of the subtypes. This description document focuses on information that applies to both variants. The STL format has two subtypes, an ASCII format and a binary format. STL File Format (3D Printing) – Simply Explained provides a useful introduction to the format in the context of 3D printing. Examples of fairly full descriptions of STL are in the Wikipedia entry for the STL file format and The StL Format: Standard Data Format for Fabbers. Like other early digital formats, STL is a proprietary format however, its extremely simple structure has been openly documented since the 1990s, although not necessarily by copying the original text. See Adoption in Sustainability Factors, below. Part 1: A Study of Existing Interfaces from 1997. The STL format was widely adopted in the 1990s and referred to as a de facto standard for rapid prototyping, for example in Interface Between CAD and Rapid Prototyping Systems. STL was first documented in StereoLithography Interface Specification in 1988 by 3D Systems, Inc. STL is sometimes referred to as "Standard Tessellation Language" or "Standard Triangle Language." The term used for breaking the geometry of a surface into a series of small triangles, or other polygons, is "tessellation." The format was developed initially for stereolithography, a form of 3D printing used in the late 1980s for rapid prototyping. The STL (STereoLithography) file format is an openly documented format for describing the surface of an object as a triangular mesh, that is, as a representation of a 3-dimensional surface in triangular facets. Also referred to as "Standard Triangle Language" and "Standard Tessellation Language." STL (STereoLithography) File Format Family.
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