The orientation of the facets is specified in two ways as follow: Orientation of a facet is determined by the direction of the unit normal and the order in which the vertices are listed.
The specifications of STL file format can be examined from following two aspects.
The StL file does not contain any scale information the coordinates are in arbitrary units. There are a total of 12 numbers stored for each facet as the Normal and each vertex are specified by three coordinates each. The facets define the surface of a 3D object and is uniquely identified by a unit normal, which is a line perpendicular to the triangle with length of 1.0, and by three vertices. File Format SpecificationsĪn STL file represents a surface geometry using facets. A revised version of STL file format, known as STL 2.0, was proposed in 2009 with updates to the file format. It was developed by 3D Systems for its usage in commercial 3D printers. The development of STL file format dates back to 1987.
There is no information available in the STL file format for representation of colour, texture or other common CAD model attributes. Resultant data is used by applications to determine the cross section of the 3D shape to be built by the fabber.
#Stl vector code series#
It represents a surface as a series of small triangles, known as facets, where each facet is described by a perpendicular direction and three points representing the vertices of the triangle. The file format finds its usage in several fields such as rapid prototyping, 3D printing and computer-aided manufacturing. STL, abbreviation for stereolithrography, is an interchangeable file format that represents 3-dimensional surface geometry.
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