protected NavMeshPath path;
NavMeshAgent agent = null;

void Start () {
    path = new NavMeshPath();
    agent = GetComponent<NavMeshAgent>();
}

public void SetNextWaypoint(Vector3 location){
    agent.ResetPath();
    path.ClearCorners();
    agent.CalculatePath(nextWayPoint, path);
    agent.SetPath(path);
}