About Creating and Destroying objects

Unity Engine
1

Hello guys, i’m really stuck with creating and destroying objects on both server and client side. I’m trying to understand how the Command and RPC’s work on both side. But i only could manage to spawn the object on server&client side, but failed on destroy it. I would be grateful if anyone can help me to understand how i can manage the server or client side. A basic line of code would really help me to understand how it works.

What im trying is to create a cube on both server/client side. Whenever the player clicks on it, destroy the cube on both side.

2

Ok, so you should be able to achieve that by using some logic like this:

  1. Server Spawn’s the cube on server & client side.
  2. Player chooses a cube to destroy, and send a command asking the server to destroy it.
  3. Server check if that cube is not already destroyed, and sends back a clientrpc to all; asking to destroy that cube.
  4. Voilà!

So, to be able to tell the server witch cube to destroy, what i do is create a “cubeManager” as an example, where i have a list or array of cubes that i spawn by name , then the player sends a cube’s name with a command to the server, then the server finds that name on the list of cubes and then it Sends back a delete clientRpc to all clients to delete that cube.

Do you need a code example?

3

Thanks for the response, here is what i tryied;

I have a spawn object called “Object Spawn” which has a network identity.

Also i have a GameManager which has the “Object Spawner” script with network identity on it.

On my player prefab i have a script called;
SpawnObject;

using UnityEngine;
using System.Collections;
using UnityEngine.Networking;

public class SpawnObject : NetworkBehaviour {

void Update () {
if (!isLocalPlayer) return;
if (Input.GetKeyDown(KeyCode.Alpha5))
GameObject.Find(“GameManager”).GetComponent().SpawnCube();
}
}

ObjectSpawner;

using UnityEngine;
using System.Collections;
using UnityEngine.Networking;

public class ObjectSpawner : NetworkBehaviour
{

[SerializeField]
GameObject cubePrefab;
[SerializeField]
GameObject ojectSpawn;

public void SpawnCube()
{
CmdSpawnCube();
}

[Command]
void CmdSpawnCube()
{
GameObject SceneObjects = GameObject.Find(“Object Spawn”);
GameObject Cube = (GameObject)Instantiate(cubePrefab, ojectSpawn.transform.position, Quaternion.identity) as GameObject;
NetworkServer.Spawn(Cube);
Cube.transform.SetParent(SceneObjects.transform);
}

}

To destroy the clicked object;

using UnityEngine;
using System.Collections;
using UnityEngine.Networking;

public class DestroyPickedItem : NetworkBehaviour
{
[SyncVar]
public GameObject Cube;
public Vector2 hotSpot = Vector2.zero;

void OnMouseDown()
{
if (Input.GetMouseButtonDown(0))
{
RaycastHit hit;
Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
if (Physics.Raycast(ray, out hit, 40))
{
CmdDestroyCube();
Cursor.SetCursor(null, Vector2.zero, cursorMode);
}
}
}
[Command]
void CmdDestroyCube()
{
NetworkServer.Destroy(Cube);
}
}

Here is what happens;

Everything works fine by server/host side. But whenever i try to spawn the object on client side it says;
Trying to send command for object without authority.
UnityEngine.Networking.NetworkBehaviour:SendCommandInternal(NetworkWriter, Int32, String)
ObjectSpawner:CallCmdSpawnCube()
ObjectSpawner:SpawnCube() (at Assets/Scripts/ItemInteractionSystem/ObjectSpawner.cs:25)
SpawnObject:Update() (at Assets/Scripts/ItemInteractionSystem/SpawnObject.cs:16)

and also when i delete the object, it destroys only on the client side.

I tried to spawn the object using NetworkServer.SpawnWithClientAuthority which cause some other errors on client side.

4

The idea why i want to learn this is, i want the players drop items to the ground and pick them. It would be really helpful if you could write an example code to solve my situation.