// Use this for initialization
void Start()
{
System.Diagnostics.Stopwatch watch = new System.Diagnostics.Stopwatch();
watch.Start();
itm = NavMeshBuilder.BuildTerrainNavmesh(GameObject.FindObjectOfType <Terrain>());
Debug.Log("Terrain built in " + watch.Elapsed);
watch.Reset(); watch.Start();
StartCoroutine(itm.OptimizeMesh());
StartCoroutine(Draw());
}