[uNet] how to spawn the object

I do so (method not have attributes)

Code (CSharp):

1. GameObject AnotherProjectile = Instantiate(ProjectileTypePrefab, FirePosition.transform.position, FirePosition.transform.rotation) as GameObject;
2.         ClientScene.RegisterPrefab(AnotherProjectile);
3.         Bullet proj = AnotherProjectile.GetComponent<Bullet>();
4.         proj.Damage = Damage;
5.      
6.         Vector3 target = new Vector3(FirePosition.transform.position.x * Random.Range(-FireDispersionRadius, FireDispersionRadius), FirePosition.transform.position.y * Random.Range(-FireDispersionRadius, FireDispersionRadius), FirePosition.transform.position.z);
7.         target.z *= MaxDistance;
8.      
9.         NetworkServer.Spawn(AnotherProjectile);
10.         AnotherProjectile.GetComponent<Rigidbody>().AddForce(Vector3.RotateTowards(transform.forward, target, Time.deltaTime, 0f) * FireForcePower);

But nothing happens...
Please, help. Thanks.

 

First, please use the code tags.

Second, are you getting any errors or messages in the console? Where is this script? NetworkServer.Spawn can only be called from the server. Clients usually pass the needed information to the server and the server spawns the object with the necessary information at the desired location.

 

http://forum.unity3d.com/threads/using-code-tags-properly.143875/

 

It hangs on the script of the weapon, the weapon in turn a child object of the player to prefab.
Error: NetworkServer is not active

 

How fix this error?

 

From what I know, you must register every networked prefab on start of the game and on every client - every client must know what object to spawn when you use NetworkServer.Spawn(). So you register for example all the gun and bullet prefabs in Start(), then on server you Instantiate it, set its SyncVars and then Spawn it.

 

then enter the problem because I have implemented a spawn shooting through the bullets. can register them in Start() of the bullet?

 

Yes you can, but make sure that everything is registered in the same order on all clients. There is a list of registered prefabs, and if server tells clients to instantiate for example 5. gameobject, it must be the same gameobject everywhere.

 

5 - it is name?

it seems there is no example not to understand...

 

No sorry it was just an example. I'll try to show it better. Let's say you have various networked objects:

1. Gun
2. Bullet
3. AmmoPack

You register them all in Start(). IF Start() of each of your object runs in the same order everytime it is ok, but on some client it can register in this order:

1. Gun
2. AmmoPack
3. Bullet

Now on server you Instantiate a bullet and call Spawn(bullet). Server tells all clients to instantiate their bullet and expects it to be registered prefab number 2. But on some clients the Start in AmmoPack ran earlier than in Bullet for some reason, and now what happens is that the client instantiates AmmoPack, because for it it's registered prefab number 2.

That's why you should register your prefabs in the same order every time preferably in one method, so they register the same way everytime.

Also you register the PREFABS and not the actual instantiated objects, so you can't even ClientScene.RegisterPrefab() in Start() of bullet, because Start() of bullet runs AFTER you instantiate it. You need to register it before any bullet instantiates.

 

Result the method that is called when a player shoots to spawn a bullet.
(method have not attributes)

Code (CSharp):

1.     void CmdSpawnProjectile()
2.     {
3.         GameObject AnotherProjectile = ProjectileTypePrefab;
4.         Bullet proj = AnotherProjectile.GetComponent<Bullet>();
5.         proj.Damage = Damage;
6.         ClientScene.RegisterPrefab(AnotherProjectile);
7.         NetworkServer.Spawn(AnotherProjectile);
8.         AnotherProjectile = Instantiate(AnotherProjectile, FirePosition.transform.position, FirePosition.transform.rotation) as GameObject;
9.  
10.         Vector3 target = new Vector3(FirePosition.transform.position.x * Random.Range(-FireDispersionRadius, FireDispersionRadius), FirePosition.transform.position.y * Random.Range(-FireDispersionRadius, FireDispersionRadius), FirePosition.transform.position.z);
11.         target.z *= MaxDistance;
12.      
13.         AnotherProjectile.GetComponent<Rigidbody>().AddForce(Vector3.RotateTowards(transform.forward, target, Time.deltaTime, 0f) * FireForcePower);
14.     }

 

My explaining skills may be seriously impaired. Now you registered it before, that is nice, but what i meant is that the prefab needs to be registered once on start of the game, then you can Instantiate and Spawn it how many times you want.
Example from docs changed to gun:

Code (CSharp):

1. using UnityEngine;
2. using UnityEngine.Networking;
3.  
4. public class Gun : NetworkBehaviour {
5.  
6.     public GameObject bulletPrefab;
7.  
8.     public void OnStartClient()
9.     {
10.         ClientScene.RegisterPrefab(bulletPrefab);
11.     }
12.  
13.     [Command]
14.     public CmdSpawnBullet(Vector3 pos, Quaternion rot)
15.     {
16.         var plant = (GameObject)Instantiate(bulletPrefab, pos, rot);
17.         NetworkServer.Spawn(plant);
18.     }
19. }

 

And we have:

Spoiler: Error

SpawnObject for Test Bullet Prefab(Clone) (UnityEngine.GameObject), NetworkServer is not active. Cannot spawn objects without an active server.
UnityEngine.Networking.NetworkServer:Spawn(GameObject)
FireArms:CmdSpawnProjectile() (at Assets/Resources/Scripts/Shooting System/Weapons/FireArms.cs:99)
FireArms:Fire() (at Assets/Resources/Scripts/Shooting System/Weapons/FireArms.cs:55)
UnityStandardAssets.Characters.FirstPerson.FirstPersonController:Update() (at Assets/Resources/Scripts/Controller/FirstPersonController.cs:103)

 

You have to actually start a networked game in order to spawn things over the network......

 

I network and do.

 

I don't know what that means.

Unity isn't lying to you. It's telling you that your server isn't active.

 

Okay, but then what do I do?

 

Where's your code that starts a networked game?

 

That is? I have an object with NetworkManager and it is NetworkManagerHUD and through it create and join. Or you another meant?

 

is the Spawn in that CmdSomething method? If it is, then weird, it should execute on server.

 

You can only use NetworkServer.Spawn if you're the host. Other players should send a Command to the host to spawn stuff. I noticed your method isn't decorated with the Command attribute - it has to be.

 

First method:

Code (CSharp):

1.     public override void Fire()
2.     {
3.         Debug.Log(CurrentAmmoInto + "/" + CurrentMagazines);
4.         if (Input.GetButton("Fire") && CurrentAmmoInto > 0 && ShootTimer <= 0 && ReloadTimer <= 0)
5.         {
6.             FireParticle();
7.  
8.             var AnotherProjectile = ProjectileTypePrefab;
9.             Bullet proj = AnotherProjectile.GetComponent<Bullet>();
10.             proj.Damage = Damage;
11.             CmdSpawn(AnotherProjectile, FirePosition.transform.position, FirePosition.transform.rotation);
12.  
13.             Vector3 target = new Vector3(FirePosition.transform.position.x * Random.Range(-FireDispersionRadius, FireDispersionRadius), FirePosition.transform.position.y * Random.Range(-FireDispersionRadius, FireDispersionRadius), FirePosition.transform.position.z);
14.             target.z *= MaxDistance;
15.  
16.             AnotherProjectile.GetComponent<Rigidbody>().AddForce(Vector3.RotateTowards(transform.forward, target, Time.deltaTime, 0f) * FireForcePower);
17.  
18.             Debug.Log("Shot");
19.             ShootTimer = FireShootingSpeed;
20.             CurrentAmmoInto--;
21.             m_AudioSource.PlayOneShot(ShootClip);
22.             /*Vector3 targetDir = transform.position * 100 - transform.position;
23.             float step = 100 * Time.deltaTime;
24.             Vector3 newDir = Vector3.RotateTowards(transform.forward, targetDir, step, 0.0F);
25.             Debug.DrawRay(transform.position, newDir, Color.red);
26.             transform.rotation = Quaternion.LookRotation(newDir);*/
27.         }
28.     }

Second Method:

Code (CSharp):

1.     [Command] void CmdSpawn(GameObject Object, Vector3 position, Quaternion rotation)
2.     {
3.         Object = Instantiate(Object, position, rotation) as GameObject;
4.         NetworkServer.Spawn(Object);
5.     }

The above methods do not work, and more specifically - spawn.

 

Nothing there is striking me as wrong, the only thing that comes to mind is if you have set Local Player Authority in your NetworkIdentity in inspector.

 

AnotherProjectile isn't the networked projectile so manipulating its Rigidbody won't do what you think it will.

EDIT:

I bet your input code is running for every networked prefab. You should check isLocalPlayer so it only runs for the objects the player controls.

 

And third:

Code (CSharp):

1.     public override void OnStartClient()
2.     {
3.         ClientScene.RegisterPrefab(ProjectileTypePrefab);
4.     }

No, there is no Local Authority

I would now at least the object to spawn.
the bullet has not LocalPlayerAuthority.
.

 

checked LocalPlayerAuthority on the projectile so that that's not exactly working. and even locally does not appear.

EDIT:
checked the script input off on other prefab locally for everyone but himself.

 

Set LocalPlayerAuthority for the gameObject that has the script spawning bullets. Without LocalPlayerAuthority scripts can't(from what I know) use Commands.

 

I put down, but something does not work.

 

I think you can only have NetworkIdentity on root gameObject, and Commands too, so remove the second NetowrkIdentity and find a way to have the Command in root gameObject.

 

Therefore, for the sake of the test script hung the weapons on the main object. Worked. Probably have to do object Spawner with the script spawn and giving the link arms, to invoke the method.

so, now the error is more fun. He says, well, what object to spawn there. And so, the actual question is: how to spawn an object from a child object?

 

Soo you can have method in the root object like:

Code (CSharp):

1. [Command]
2. public void CmdSpawnPrefab(GameObject prefab){
3. GameObject go = Instantiate(prefab) as GameObject;
4. NetworkServer.Spawn(go);
5. }

And call it from the child weapon with the right bullet as argument.

 

I use this method:

Code (CSharp):

1.     [Command] public virtual void CmdSpawn(GameObject Object, Vector3 position, Quaternion rotation)
2.     {
3.         Object = Instantiate(Object, position, rotation) as GameObject;
4.         NetworkServer.Spawn(Object);
5.     }

But the console says when I call it, Nullreferenceexception. In this case, all of what is going on call it is not happening.

 

You can check when the object becomes null.

 

Thank you, I did itю

EDIT:
And Yes, I also want to ask to apply physics to Rigidbody also need to do it via the [Command]?

started test with two clients. The client and host, creates all fine. And here's one that a client can not do anything.

 

if one client works and other doesn't, you will have to find some mistake somewhere, and the yes, speed to rigidbody can be also applied in the command.

 

For the answer to the question about physics thank you. And what about this problem, I think I missed something.

 

Frankly I have no idea what might do that, so you will have to check which methods are running, which aren't, generally just find the problem.

 

Randomly do not register prefabs in networkmanager, where SpawnableNetworkPrefabs?

 

If you mean that the prefab sometimes doesn't register, you can either figure out why does it happen, something must make the code not run, like the class that registers it isn't active, isn't in the scene etc, or you can just put the prefab in RegisteredSpawnablePrefabs in NetworkManager in the inspector, and then you don't have to use NetworkServer.RegisterPrefab()

 

I think I found it. The clients somehow do not register prefabs.

 

Review console on the server when the client calls command:

Spoiler: Error

ArgumentException: The Object you want to instantiate is null.
UnityEngine.Object.CheckNullArgument (System.Object arg, System.String message) (at C:/buildslave/unity/build/Runtime/Export/UnityEngineObject.cs:196)
UnityEngine.Object.Instantiate (UnityEngine.Object original, Vector3 position, Quaternion rotation) (at C:/buildslave/unity/build/Runtime/Export/UnityEngineObject.cs:143)
NetworkController.CmdSpawn (UnityEngine.GameObject Object, Vector3 position, Quaternion rotation) (at Assets/Resources/Scripts/Network/NetworkController.cs:16)
NetworkController.InvokeCmdCmdSpawn (UnityEngine.Networking.NetworkBehaviour obj, UnityEngine.Networking.NetworkReader reader)
UnityEngine.Networking.NetworkIdentity.HandleCommand (Int32 cmdHash, UnityEngine.Networking.NetworkReader reader) (at C:/buildslave/unity/build/Extensions/Networking/Runtime/NetworkIdentity.cs:620)
UnityEngine.Networking.NetworkServer.OnCommandMessage (UnityEngine.Networking.NetworkMessage netMsg) (at C:/buildslave/unity/build/Extensions/Networking/Runtime/NetworkServer.cs:1297)
UnityEngine.Networking.NetworkConnection.HandleReader (UnityEngine.Networking.NetworkReader reader, Int32 receivedSize, Int32 channelId) (at C:/buildslave/unity/build/Extensions/Networking/Runtime/NetworkConnection.cs:453)
UnityEngine.Networking.NetworkConnection.HandleBytes (System.Byte[] buffer, Int32 receivedSize, Int32 channelId) (at C:/buildslave/unity/build/Extensions/Networking/Runtime/NetworkConnection.cs:409)
UnityEngine.Networking.NetworkConnection.TransportRecieve (System.Byte[] bytes, Int32 numBytes, Int32 channelId) (at C:/buildslave/unity/build/Extensions/Networking/Runtime/NetworkConnection.cs:561)
UnityEngine.Networking.NetworkServer.OnData (UnityEngine.Networking.NetworkConnection conn, Int32 receivedSize, Int32 channelId) (at C:/buildslave/unity/build/Extensions/Networking/Runtime/NetworkServer.cs:753)
UnityEngine.Networking.NetworkServer+ServerSimpleWrapper.OnData (UnityEngine.Networking.NetworkConnection conn, Int32 receivedSize, Int32 channelId) (at C:/buildslave/unity/build/Extensions/Networking/Runtime/NetworkServer.cs:1845)
UnityEngine.Networking.NetworkServerSimple.HandleData (Int32 connectionId, Int32 channelId, Int32 receivedSize, Byte error) (at C:/buildslave/unity/build/Extensions/Networking/Runtime/NetworkServerSimple.cs:382)
UnityEngine.Networking.NetworkServerSimple.Update () (at C:/buildslave/unity/build/Extensions/Networking/Runtime/NetworkServerSimple.cs:248)
UnityEngine.Networking.NetworkServer.InternalUpdate () (at C:/buildslave/unity/build/Extensions/Networking/Runtime/NetworkServer.cs:705)
UnityEngine.Networking.NetworkServer.Update () (at C:/buildslave/unity/build/Extensions/Networking/Runtime/NetworkServer.cs:655)
UnityEngine.Networking.NetworkIdentity.UNetStaticUpdate () (at C:/buildslave/unity/build/Extensions/Networking/Runtime/NetworkIdentity.cs:1060)

EDIT:
Fixed by this method:

Code (CSharp):

1.        [HideInInspector] public GameObject LastSpawnedGameObject;
2.  [Command] public virtual void CmdSpawnAtResources(string ObjectResourcesPath, Vector3 position, Quaternion rotation)
3.     {
4.         GameObject Object = Instantiate(Resources.Load(ObjectResourcesPath), position, rotation) as GameObject;
5.         NetworkServer.Spawn(Object);
6.         LastSpawnedGameObject = Object;
7.         Debug.Log("Object spawned[" + Object.name + "]");
8.     }