Is there a way to get the vertices/edges that make up a hole in a navmesh? For example, the white poly in this image?
Not sure what you are trying to achieve, the only way I know to get hold of the mesh is to do this:
NavMeshTriangulation navmeshData = NavMesh.CalculateTriangulation();
Mesh mesh = new Mesh();
mesh.SetVertices(navmeshData.vertices.ToList());
mesh.SetIndices(navmeshData.indices, MeshTopology.Triangles, 0);
Then run a hole detection algorithm against this mesh. Unfortunately you cannot change the mesh and assign it back to the NavMesh, if that is what you wanted to achieve.
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