github.com/hschendel/stl
Package stl implements functions to read, write, and transform files in the Stereolithography/Surface Tesselation Language (.stl) file format used in 3D modelling. The format specification was taken from http://www.ennex.com/~fabbers/StL.asp, found at http://en.wikipedia.org/wiki/STL_%28file_format%29. While STL stores the data in single precision 32 bit floating point numbers, the stl package does all calculations beyond simple addition in double precision 64 bit (float64). Usage Example Everything that operates on a model is defined as a method of Solid. Note that The STL format has two variants, a human-readable ASCII variant, and a more compact and precise binary variant which is preferrable. The Solid.BinaryHeader field and the Triangle.Attributes fields will be empty, after reading, as these are not part of the ASCII format. The Solid.Name field is read from the first line after "solid ". It is not checked against the name at the end of the file after "endsolid ". The stl package will also not cope with Unicode byte order marks, which some text editors might automatically place at the beginning of a file. The Solid.BinaryHeader field is filled with all 80 bytes of header data. Then, ReadFile will try to fill solid.Name with an ASCII string read from the header data from the first byte until a \0 or a non-ASCII character is detected. As always when you do linear transformations on floating point numbers, you get numerical errors. So you should expect a vertex being rotated for 360° not to end up at exactly the original coordinates, but instead just very close to them. As the error is usually far smaller than the available precision of 3D printing applications, this is not an issue in most cases. You can implement the Writer interface to directly write into your own data structures. This way you can use the CopyFile and CopyAll functions.
Readme
A library to read, write, and transform Stereolithography (.stl) files in Go. It is used in the command line STL manipulation tool stltool.
Using go's builtin installation mechanism:
go get github.com/hschendel/stl
solid, errRead := stl.ReadFile(inputFilename)
if errRead != nil {
// handle
}
solid.Scale(25.4) // Convert from Inches to mm
errWrite := solid.WriteFile(outputFilename)
You can implement the stl.Writer interface to directly write into your own data structures.
This way you can use the stl.CopyFile and stl.CopyAll functions.
var ownData ownDataStructure // implements stl.Writer
err := stl.CopyFile("somefile.stl", &ownData)
The package godoc documentation should be helpful. Or just start a local godoc server using this command:
godoc -http=:6060
Then open http://localhost:6060/pkg/github.com/hschendel/stl/ in your browser.
The stl package is licensed under the MIT license. See LICENSE file.
FAQs
Package stl implements functions to read, write, and transform files in the Stereolithography/Surface Tesselation Language (.stl) file format used in 3D modelling. The format specification was taken from http://www.ennex.com/~fabbers/StL.asp, found at http://en.wikipedia.org/wiki/STL_%28file_format%29. While STL stores the data in single precision 32 bit floating point numbers, the stl package does all calculations beyond simple addition in double precision 64 bit (float64). Usage Example Everything that operates on a model is defined as a method of Solid. Note that The STL format has two variants, a human-readable ASCII variant, and a more compact and precise binary variant which is preferrable. The Solid.BinaryHeader field and the Triangle.Attributes fields will be empty, after reading, as these are not part of the ASCII format. The Solid.Name field is read from the first line after "solid ". It is not checked against the name at the end of the file after "endsolid ". The stl package will also not cope with Unicode byte order marks, which some text editors might automatically place at the beginning of a file. The Solid.BinaryHeader field is filled with all 80 bytes of header data. Then, ReadFile will try to fill solid.Name with an ASCII string read from the header data from the first byte until a \0 or a non-ASCII character is detected. As always when you do linear transformations on floating point numbers, you get numerical errors. So you should expect a vertex being rotated for 360° not to end up at exactly the original coordinates, but instead just very close to them. As the error is usually far smaller than the available precision of 3D printing applications, this is not an issue in most cases. You can implement the Writer interface to directly write into your own data structures. This way you can use the CopyFile and CopyAll functions.
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