NavMesh.AddMeshData.position <-- Doesn't Exist?

Edit: Unity version 5.6.0f3

The scripting manual here: https://docs.unity3d.com/ScriptReference/AI.NavMeshData.html

States that it is a public variable (as is rotation) but they are unavailable.

Code (CSharp):

1.     public Mesh CreateMesh()
2.     {
3.         Mesh mesh = new Mesh();
4.         mesh.vertices = vertices;
5.         mesh.triangles = triangles;
6.         mesh.uv = uvs;
7.         mesh.RecalculateNormals();
8.         for (int i = 0; i < mesh.vertices.Length; i++)
9.         {
10.             // For each set of triangles which are Vector3's, we will add them to the NavMesh
11.             TerrainType[] regions = GameObject.FindGameObjectWithTag("GameManager").GetComponent<MapGenerator>().regions;
12.             if( vertices[i].y < regions[3].height || vertices[i].y >= regions[13].height)
13.             {
14.                 // Not Walkable
15.             } else
16.             {
17.                 // Walkable
18.                 NavMeshData tmp = new NavMeshData();
19.                 tmp.position = vertices[i];    // <--- This is the part that doesn't work.
20.                 NavMesh.AddNavMeshData(tmp, vertices[i], Quaternion.AngleAxis(90, Vector3.up));
21.             }
22.         }
23.      
24.         return mesh;
25.     }

This is the code I am going through. I create a mesh from PerlinNoise, and I want to take the vertices, and if it's in a certain 'height' range, then I want to add them as walkable terrain for the NavMesh. Then I will update the navmesh when it loads, and then I can have a random map with navmesh generated on the fly... however... I have hit a wall.

 

The property was added in the first patch release of 5.6. ( see https://unity3d.com/unity/qa/patch-releases?version=5.6 )

I'm not sure i see what you're trying to do in the example above - the navmesh data needs to be built using the AI.NavMeshBuilder API - see e.g. https://docs.unity3d.com/ScriptReference/AI.NavMeshBuilder.BuildNavMeshData.html