Standard function on networkBehaviour called on the server?

Question

I must be missing something simple but I havent been able to find an answer so bear with me...

I have a script which is called from a [Command] function and inside has the PlayerDie funtion. (this script is on the player with the local authority).

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 using UnityEngine.Networking;
 using UnityEngine.UI;
 
 public class PlayerHealth : NetworkBehaviour {
 
     [SyncVar] int health = 100;
 
     public GameObject deathCam;
 
     public void TakeDamage(int damage)
     {
         health -= damage;
         if (health <= 0)
         {
             PlayerDie();
         }
     }
 
     void PlayerDie()
     {
         Instantiate(deathCam, transform.position, Quaternion.identity);
         NetworkServer.Destroy(gameObject);
     }
 
 }

As you can see I am Instantiating a gameObject on that function and also destroying the player gameObject. The destruction happens on all the clients and the Instantiation happens only on the server even when the local client isn't the host. My question is why? From my understanding simple void functions should be called localy like a monoBehaviour script but I am noticing this getting called on the server instead although its not a command. As a result i am seeing the "deathCam" object get spawned on the host and not the client who "died".

Answer 1

Best Answer

Answer by mossflower · Dec 29, 2017 at 06:46 PM

If you want to have the clients do something, you have to make it an RPC:

 [TargetRpc]
 void TargetPlayerDie(NetworkConnection connection)
 {
     Instantiate(deathCam, transform.position, Quaternion.Identity);
 }

Also, you probably want to Destroy from the Server:

 [Command]
 void CmdOnServer() { ...
 playerHealth.TargetPlayerDie(playerHealth.connectionToClient);
 NetworkServer.Destroy(playerHealth.gameObject);

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stratos_kakalis · Dec 30, 2017 at 07:22 AM 0

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Yes, but that's what buggs me. Although I am not using a command I am getting that function called on the server. (doesn't make sense I am going to make sure that's the case). Also I don't want an Rpc call because I only want the gameobject with the script on the local client to update not necessarily for all the players.

stratos_kakalis · Dec 30, 2017 at 08:40 AM 0

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I went back and checked my code and things are happening as i described them. In case i wasnt clear enough i have a function:

 [Command]
 void CmdRandomFunction (){
 targetGameObject.GetComponent<SomeScript>().TakeDamage();
 }

then on the "SomeScript":

 ....
 
 public void TakeDamage(){
 PlayerDie();
 }
 
 void PlayerDie(){
 Instantiate (something, somewhere, withSomeRotation)
 }
 
 ....

the Instantiation happens on the server. Is it because the script is ultimately being called by a command? And how could i call it localy...?

mossflower stratos_kakalis · Dec 30, 2017 at 05:21 PM 0

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Instead of thinking of things as happening "locally", it helps to always think of something as either happening on the server or happening on the client. Health should be managed on the server, and when a player dies, the client for that player should be sent a message saying they died. You can use [TargetRpc] to make it happen specifically on the client for the player that died, instead of [ClientRpc] which would make it happen on all clients. I think your "SomeScript" should look like this:

 ....
 
 public void TakeDamage(int damage) {
     if (!isServer)
         return;
     health -= damage;
     if (health <= 0) {
         TargetPlayerDie(connectionToClient);
         NetworkServer.Destroy(gameObject);
     }
 }
 
 [TargetRpc]
 void TargetPlayerDie(NetworkConnection connection) {
     Instantiate(something, somewhere, withSomeRotation);
 }

 ...

stratos_kakalis mossflower · Dec 31, 2017 at 10:59 AM 0

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Oh i didn't understand in your previous answer you suggested a TargetRpc I only knew the ClientRpc function. I guess it can't work the way I imagined but this is the closest workaround. Thanks for the help, this works!

Standard function on networkBehaviour called on the server?

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