GMesh enables creating reliable geometry editing tools. It is a graph-based Mesh data structure (kind of like a relational database) for geometry editing via Euler operators. It is built from the ground up to enable Unity Job System support.
GMesh is developed to support "Mesh Graph", a node-based procedural geometry generator for Unity.
Simple code example:
var gmesh = new GMesh();
gmesh.CreateFace(vertices);
_meshFilter.sharedMesh = gmesh.ToMesh();
gmesh.Dispose();
Where vertices is any IEnumerable collection of 3 or more points (float3 or Vector3).
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GMesh is similar to Blender's BMesh and BMeshUnity (incompatible with Job System).
Mesh Graph is a node-based procedural geometry design tool I am developing for the Unity Asset Store.
Think Blender's Geometry Nodes but directly applicable to creating game meshes.
"G" stands for "Graph" but could also refer to "Geometry" or "General" because the primary purpose is to provide a reliably editable mesh data structure. In turn it cannot be rendered directly by Unity, a (fast) conversion to Mesh as a final step is required and will be included.
Since the "B" in BMesh stands for Blender I thought it better to use a different prefix, and since I am working on a Node Graph based visual mesh geometry editing tool called "Mesh Graph" and the data structure itself is sort of a static graph (or relational database) it came to be called "GMesh".
On the other hand, I wanted to avoid having "GraphMesh" in "Mesh Graph". That could be confusing. ;)
You cannot easily edit a Mesh knowing just about the vertices and triangles since you are lacking information about other topology features: faces, loops and edges, and how they relate to each other.
The key word is "easily". While you can do a lot of modifications to a Unity Mesh, the operations (and the code needed to implement them) are a lot simpler and more reliable if the data structure allows you to work on faces and edges too.
Just look at the simplicity and elegance of Euler operators for mesh modifications that GMesh enables.