STL (file format)

High school (ages 12+)
Science & Technology

Name:

Date:

Step 1 · Read the article

Open the article and read it at the level above. Then answer the questions below in your own words.

https://smallwhale.org/articles/stl--file-format-

Write what each word means, using the article.

Do not copy the article. Write two things you learned, the way you would explain them to a friend.

Answers below are taken from the article’s stored facts, so they match what the student read.

1. What is the originating entity?3D Systems, developed for stereolithography CAD software
2. What is the core geometric primitive?Triangles, each defined by three vertices and a unit normal vector
3. What is an STL file?An STL file is a special file that tells 3D printers how to build an object. It describes the object’s surface using many small triangles.
4. Why do STL files use triangles?Triangles are simple shapes that can be put together to make any surface. This makes the file easy for printers to read and use.

Tessellation: The process of covering a surface with geometric shapes, typically triangles, to approximate a complex form.
Vertices: The corner points of a triangle in a three-dimensional space, defined by their x, y, and z coordinates.
Unit Normal Vector: A vector of length one that is perpendicular to the surface of a triangle, indicating its outward orientation.
Cartesian Coordinate System: A system that uses three perpendicular axes (x, y, and z) to define the position of a point in space.