STL format is mainly used for CAD stereo-lithography, a 3D process that can transform an image into a solid virtual object. This technique uses this format in order to allow models to be accessed by as many CAD software tools as possible.
STL format can describe the surface of a 3D object without any additional representation of color, texture or other attributes.
These files can be viewed only by using specialized CAD software solutions that will also allow users to export STF files to other formats.
In the end, users will retain the liberty regarding the format that should be used for their designed object.
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