Cotangent is an application for 3D printing that Gradientspace Corp developed from 2016 to 2018. The app was built in Unity, based on open-source C# geometry processing and slicing/toolpathing libraries I developed. Although development is no longer being pursued, you can still download and run Cotangent on Windows at https://www.cotangent.io. Lots more details about the available toolset there as well.

The Cotangent application code (built on top of Unity 2018) is available on GitHub under an MIT license: https://github.com/gradientspace/Cotangent

The Open-Source Component libraries used to build Cotangent include:

• gsGCode - a C# GCode parsing, manipulation, and generation library
• gsSlicer - a C# mesh slicing and 3D printing toolpathing library
• geometry3Sharp - a C# mesh/geometry processing library
• frame3Sharp - a C# framework for building 3D Tool Applications in Unity

Cotangent's UI combined mesh editing and 3D print prep/slicing

Mesh Autorepair fills ensures all parts are closed solids

Adaptive remeshing preseves sharp edges and fine details

Cotangent's new approach to tree-style support structures

Rebuild large missing scan regions with mesh winding number

Gradientspace Slicer handles open sheets, with intersections

Gradientspace Slicer can automatically add tolerance between parts based on printer settings

New Hole Filling strategies that recover sharp edges

Mesh simplification with feature preservation