TerrainChunk + collider, unoptimized

    public TerrainChunk(Vector2 coord, int size, Transform parent, Material material) {
        position = coord * size;
        bounds = new Bounds(position,Vector2.one * size);
        Vector3 positionV3 = new Vector3(position.x,0,position.y);

        meshObject = new GameObject("Terrain Chunk");
        meshRenderer = meshObject.AddComponent<MeshRenderer>();
        meshFilter = meshObject.AddComponent<MeshFilter>();
        meshCollider = meshObject.AddComponent<MeshCollider>();
        meshRenderer.material = material;

        meshObject.transform.position = positionV3;
        meshObject.transform.parent = parent;
        SetVisible(false);

        mapGenerator.RequestMapData(OnMapDataReceived);
    }

    void OnMapDataReceived(MapData mapData) {
        mapGenerator.RequestMeshData (mapData, OnMeshDataReceived);
    }

    void OnMeshDataReceived(MeshData meshData) {
        Mesh mesh = meshData.CreateMesh ();
        meshFilter.mesh = mesh;
        meshCollider.sharedMesh = mesh;
    }


    public void UpdateTerrainChunk() {
        float viewerDstFromNearestEdge = Mathf.Sqrt(bounds.SqrDistance (viewerPosition));
        bool visible = viewerDstFromNearestEdge <= maxViewDst;
        SetVisible (visible);
    }

    public void SetVisible(bool visible) {
        meshObject.SetActive (visible);
    }

    public bool IsVisible() {
        return meshObject.activeSelf;
    }

}