The normal vector should have unit length. The normal vector, if given, is included as part of the facet record, and is identified by the normal keyword. Each triangle begins with a facet record and ends with an endfacet record. The file begins with a solid record, (which can include a name for the object), and ends with an endsolid record. A normal vector for the triangle may also be listed. The vertices of the triangles should be listed in counterclockwise order, as viewed from outside the surface. Stereolithography is a means of creating physical 3D models of such objects, using resin or carefully cut and joined pieces of paper.Īn ASCII or binary STL file usually has a filename extension of ".stl".Īn STL file contains a description of the surface of a solid that has been decomposed into triangles. "STL" stands for "stereolithography", and indicates that the primary purpose of this file format is to describe the shape of a 3D stationary object.
STLA is a data directory which contains examples of "ASCII STL" files.
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