STL

Contents

• Introduction
• Keywords
• Grammar
• Cube Example

Introduction

STL is the stereolithography interface language which is the rapid prototyping's current de facto standard. It is a flatten boundary representation where the only primitives are triangles. The normals of the triangles should agree with the counterclockwise contour orientation paradigm.

Keywords

• solid
• facet
• normal
• outer
• loop
• vertex
• endloop
• endfacet
• endsolid

Grammar

solid [part name]
  facet normal value value value
    outer loop
      vertex value value value
      vertex value value value
      vertex value value value
    endloop
  endfacet
  ...
endsolid [part name]

Cube

solid
  facet normal 0.000000 1.000000 0.000000
    outer loop
      vertex 1.000000 1.000000 1.000000
      vertex 1.000000 1.000000 -1.000000
      vertex -1.000000 1.000000 -1.000000
    endloop
  endfacet
  facet normal 0.000000 1.000000 0.000000
    outer loop
      vertex 1.000000 1.000000 1.000000
      vertex -1.000000 1.000000 -1.000000
      vertex -1.000000 1.000000 1.000000
    endloop
  endfacet
  facet normal 0.000000 0.000000 1.000000
    outer loop
      vertex 1.000000 1.000000 1.000000
      vertex -1.000000 1.000000 1.000000
      vertex -1.000000 -1.000000 1.000000
    endloop
  endfacet
  facet normal 0.000000 0.000000 1.000000
    outer loop
      vertex 1.000000 1.000000 1.000000
      vertex -1.000000 -1.000000 1.000000
      vertex 1.000000 -1.000000 1.000000
    endloop
  endfacet
  facet normal 1.000000 0.000000 0.000000
    outer loop
      vertex 1.000000 1.000000 1.000000
      vertex 1.000000 -1.000000 1.000000
      vertex 1.000000 -1.000000 -1.000000
    endloop
  endfacet
  facet normal 1.000000 0.000000 0.000000
    outer loop
      vertex 1.000000 1.000000 1.000000
      vertex 1.000000 -1.000000 -1.000000
      vertex 1.000000 1.000000 -1.000000
    endloop
  endfacet
  facet normal 0.000000 0.000000 -1.000000
    outer loop
      vertex -1.000000 -1.000000 -1.000000
      vertex 1.000000 1.000000 -1.000000
      vertex 1.000000 -1.000000 -1.000000
    endloop
  endfacet
  facet normal 0.000000 -1.000000 0.000000
    outer loop
      vertex -1.000000 -1.000000 -1.000000
      vertex 1.000000 -1.000000 -1.000000
      vertex 1.000000 -1.000000 1.000000
    endloop
  endfacet
  facet normal 0.000000 -1.000000 0.000000
    outer loop
      vertex -1.000000 -1.000000 -1.000000
      vertex 1.000000 -1.000000 1.000000
      vertex -1.000000 -1.000000 1.000000
    endloop
  endfacet
  facet normal -1.000000 0.000000 0.000000
    outer loop
      vertex -1.000000 -1.000000 -1.000000
      vertex -1.000000 -1.000000 1.000000
      vertex -1.000000 1.000000 1.000000
    endloop
  endfacet
  facet normal -1.000000 0.000000 0.000000
    outer loop
      vertex -1.000000 -1.000000 -1.000000
      vertex -1.000000 1.000000 1.000000
      vertex -1.000000 1.000000 -1.000000
    endloop
  endfacet
  facet normal 0.000000 0.000000 -1.000000
    outer loop
      vertex -1.000000 -1.000000 -1.000000
      vertex -1.000000 1.000000 -1.000000
      vertex 1.000000 1.000000 -1.000000
    endloop
  endfacet
endsolid