Question about object spawning.

Unity Engine
1

Do we have to instantiate objects on both the client AND server? Or do we just instantiate objects on the server then spawn them?

So far, my code only generates a rectangular map on the host, while the client stays black.

    void Awake () {
        Debug.Log (isClient);
        if (isClient) {
            RegisterPrefabs ();
        }
    }

    void Start(){
        Debug.Log (isServer);
        if (isServer) {
            extractMapData ("Assets\\Map Data\\sample_map.txt");
            mapTiles = new ArrayList ();
            InstantiateMap ();
        }
    }

    void InstantiateMap(){
        for (int b = 0; b < y; b++) {
            for( int a = 0; a < x; a++){
                GameObject toInstantiate = null;
                switch(mapData[a, b]){
                case 0:
                toInstantiate = ocean[Random.Range(0,ocean.Length)];
                break;
                case 2:
                toInstantiate = plain[Random.Range(0,ocean.Length)];
                break;
                case 3:
                toInstantiate = forest[Random.Range(0,ocean.Length)];
                break;
                case 4:
                toInstantiate = hill[Random.Range(0,ocean.Length)];
                break;
                case 5:
                toInstantiate = mountain[Random.Range(0,ocean.Length)];
                break;
                }

                Instantiate(toInstantiate, new Vector3(a, -b, 0), Quaternion.identity);
                mapTiles.Add (toInstantiate);
                NetworkServer.Spawn(toInstantiate);
            }
        }
    }
2

If you NetworkServer.Spawn(), then all clients will receive the instantiated object**

**so long as the GameObject is registered in the NetworkManager.

3

One quirk I found (or at least couldn’t find documentation for) was that instantiate must be called on the server.
Instantiating on a client and then calling NetworkServer.Spawn will not create an object on the server.