IG-Mesh (standing for "I Get a Mesh..." or "Igl-Grasshopper Mesh") is a grasshopper plugin for both low-level and advanced mesh processing.

The library features tools for extracting both low-level information (e.g. vertex, edge, face relationship) and high-level properties (e.g. isolines, quad-planarization) that many mesh processing plugins do not provide.

IG-Mesh is developed for the general architecture, design, and fabrication community, hoping to fill the gap of mesh operations in any design-to-fabrication pipelines. The goal is to resolve the long-lasting pain of interactive mesh processing on the Rhino & Grasshopper platform.

This library is currently under the alpha-phase for initial public test. To further improve it, your contribution is needed.

Please submit an issue and describe what your mesh processing task requires and what type of functions are missing.

I will add the corresponding functions to the library after evaluation, ASAP.

1. Open Rhino and run command PackageManager.
2. Search for "IG-Mesh".
3. Install the plugin and restart Rhino.

The Project Page on Food4Rhino also holds major release versions of this library.

Pre-compiled releases are available on the GitHub repo.

1. Download the .zip file from the latest release.
2. Unzip the .zip file and put the folder into you Grasshopper Component Folder.
3. Restart Rhino and Grasshopper.

Releases with minor updates will only be published as pre-compiled releases and be hosted on github.

Below are the current planned features to be added in the next release:

• planarization using Shape-Up (done in v0.2)
• Fast geodesic distance based on the "Heat-kernel" method (done in v0.2)
• Half-Edge structure

Below is an incomplete list of functions that IG-Mesh plans to provide. The list is constantly adjusted based on feedback:

• edge-related functions for vector fields operation
• Various approaches for unrolling mesh (parametrization)
• FEM-related functions (need evaluation on speed and computational efficiency)
• voxel (tet-based) processing functionality

You need Visual Studio 2019 (2022 is not supported by McNeel) and the .NET framework to compile the project.

1. Install the official Rhino SDK.
2. Build the iglCpp project -- if no error occurs, the SDK is installed successfully.

1. Download the libigl library to your local desk.
2. Add the include dir in the Property Page of igmCpp.

Both IG-Mesh and libigl requires Eigen3. The vcpkg approach is recommended, though you can also manually link the library in the Solution Property Page.

In the NuGet package manager of Visual Studio, you should install the following packages for the solution:

• System.Collections
• System.Runtime
• Grasshopper
• RhinoCommon

You should now be able to build the whole solution and generate the .gha and .dll files.

Many of the base functions are converted from the geometry processing library libigl, and ported into C# environment through the PInvoke methods and openNURBS.

The author would like to pay his deepest gratitude to the developers for this library and the responsive Q&A during the past years¹.

The library is released under the GPL licence.

Author: Zhao Ma

If IG-Mesh contributes to an academic publication, please cite it as:

@software{ig-mesh,
  title = {IG-Mesh},
  author = {Zhao Ma},
  url = {https://github.com/xarthurx/IG-Mesh},
  doi = {10.5281/zenodo.6499203},
  version = {0.2.8}
  year = {2022}
}

You can also find the reference infomation on Zenodo.org.