Unet Instantiate

Multiplayer & Networking
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1

I have this simple building script, where if i press q i can build objects, like a foundation. But this doesnt sync over UNET? How would i make this script sync over unet?

using UnityEngine;
using System.Collections;
using System.Collections.Generic;
using UnityEngine.Networking;
public class BuildingSystem : MonoBehaviour
{
     public List<buildObjects> objects = new List<buildObjects>();
     public buildObjects currentobject;
     private Vector3 currentpos;
     private Vector3 currentrot;
     public Transform currentpreview;
     public Transform cam;
     public RaycastHit hit;
     public LayerMask layer;
     public float offset = 1.0f;
     public float gridSize = 1.0f;
     public bool IsBuilding;
     void Start()
     {
         ChangeCurrentBuilding(0);
         Cursor.visible = false;
         Cursor.lockState = CursorLockMode.Locked;
     }
     void Update()
     {
         if(Input.GetKeyDown("q"))
         {
             IsBuilding = true;
         }
         else if(Input.GetKeyDown("e"))
         {
             IsBuilding = false;
         }
         if (IsBuilding == false)
         {
             currentpreview.gameObject.SetActive(false);
         }else
         {
             currentpreview.gameObject.SetActive(true);
         }
         if (IsBuilding == true)
         {
             startPreview();
         }
         if (Input.GetButtonDown("Fire1"))
         {
             Build();
         }
         if (Input.GetKeyDown("0") || Input.GetKeyDown("1") || Input.GetKeyDown("2"))
         {
             switchCurrentBuilding();
         }
     }
     public void switchCurrentBuilding()
     {
         for (int i  = 0; i < 3; i++)
         {
             if(Input.GetKeyDown("" + i))
             {
                 ChangeCurrentBuilding(i);
             }
         }
     }
     public void ChangeCurrentBuilding(int cur)
     {
         currentobject = objects[cur];
         if(currentpreview != null)
         {
             Destroy(currentpreview.gameObject);
         }
         GameObject curprev = Instantiate(currentobject.preview, currentpos, Quaternion.Euler(currentrot)) as GameObject;
         currentpreview = curprev.transform;
     }
     public void startPreview()
     {
         if (Physics.Raycast(cam.position, cam.forward, out hit, 10, layer))
         {
             if(hit.transform != this.transform)
             {
                 showPreview(hit);
             }
         }
     }
     public void showPreview(RaycastHit hit2)
     {
         currentpos = hit2.point;
         currentpos -= Vector3.one * offset;
         currentpos /= gridSize;
         currentpos = new Vector3(Mathf.Round(currentpos.x), Mathf.Round(currentpos.y), Mathf.Round(currentpos.z));
         currentpos *= gridSize;
         currentpos += Vector3.one * offset;
         currentpreview.position = currentpos;
         if (Input.GetButtonDown("Fire2"))
         {
             currentrot += new Vector3(0,90,0);
         }
         currentpreview.localEulerAngles = currentrot;
     }
     public void Build()
     {
         PreviewObject PO = currentpreview.GetComponent<PreviewObject>();
         if (PO.IsBuildable)
         {
             Instantiate(currentobject.prefab, currentpos, Quaternion.Euler(currentrot));
         }
     }
}
[System.Serializable]
public class buildObjects
{
     public string name;
     public GameObject prefab;
     public GameObject preview;
     public int Gold;
}
2

Put NetworkIdentity (and NetworkTransform too I think?) scripts on the things you build.

3

i have, the “previewbuild” shows, but when you Instantiate the item(prefab) it doesnt spawn for the other client

4

Screenshot - 8c10ad4f5fa90e51fa74f2efb93217bc - Gyazo - Client

Screenshot - 89ebc5de56e4f453b38ecb2bac168ca6 - Gyazo - Host

IF the Client builds something it shows up for them, but not the host

5

bump?

6

Instantiate the object on the server
Assign any initial synced values you need to on the server (position, SyncVars, etc.)
Then call NetworkServer.spawn(yourGameObject)

7

you have to use network.spawn or cmd/rpc commands. I don’t see networking in your script?

8

Ok now its like this, but now i get this error on the host instead:
UnassignedReferenceException: The variable currentpreview of BuildingSystem has not been assigned.
You probably need to assign the currentpreview variable of the BuildingSystem script in the inspector.

I can still build on the host and such, but i get that error on the host if i try to build on the client

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

public class BuildingSystem : NetworkBehaviour
{
    public List<buildObjects> objects = new List<buildObjects>();
    public buildObjects currentobject;
    private Vector3 currentpos;
    private Vector3 currentrot;
    public Transform currentpreview;
    public Transform cam;
    public RaycastHit hit;
    public LayerMask layer;

    public float offset = 1.0f;
    public float gridSize = 1.0f;

    public bool IsBuilding;

    void Start()
    {
        ChangeCurrentBuilding(0);

        Cursor.visible = false;
        Cursor.lockState = CursorLockMode.Locked;
    }

    void Update()
    {
        if(Input.GetKeyDown("q"))
        {
            IsBuilding = true;
        }
        else if(Input.GetKeyDown("e"))
        {
            IsBuilding = false;
        }

        if (IsBuilding == false)
        {
            currentpreview.gameObject.SetActive(false);
        }else
        {
            currentpreview.gameObject.SetActive(true);
        }

        if (IsBuilding == true)
        {
            startPreview();
        }
        if (Input.GetButtonDown("Fire1"))
        {
            CmdBuild();
        }
        if (Input.GetKeyDown("0") || Input.GetKeyDown("1") || Input.GetKeyDown("2"))
        {
            switchCurrentBuilding();
        }
    }

    public void switchCurrentBuilding()
    {
        for (int i  = 0; i < 3; i++)
        {
            if(Input.GetKeyDown("" + i))
            {
                ChangeCurrentBuilding(i);
            }
        }
    }

    public void ChangeCurrentBuilding(int cur)
    {
        currentobject = objects[cur];
        if(currentpreview != null)
        {
            Destroy(currentpreview.gameObject);
        }
        GameObject curprev = Instantiate(currentobject.preview, currentpos, Quaternion.Euler(currentrot)) as GameObject;
        currentpreview = curprev.transform;
    }

    public void startPreview()
    {
        if (Physics.Raycast(cam.position, cam.forward, out hit, 10, layer))
        {
            if(hit.transform != this.transform)
            {
                showPreview(hit);
            }
        }
    }

    public void showPreview(RaycastHit hit2)
    {
        currentpos = hit2.point;
        currentpos -= Vector3.one * offset;
        currentpos /= gridSize;
        currentpos = new Vector3(Mathf.Round(currentpos.x), Mathf.Round(currentpos.y), Mathf.Round(currentpos.z));
        currentpos *= gridSize;
        currentpos += Vector3.one * offset;
        currentpreview.position = currentpos;
        if (Input.GetButtonDown("Fire2"))
        {
            currentrot += new Vector3(0,90,0);
        }
        currentpreview.localEulerAngles = currentrot;
    }

    [Command]
    public void CmdBuild()
    {
        PreviewObject PO = currentpreview.GetComponent<PreviewObject>();
        if (PO.IsBuildable)
        {
            GameObject prefab = (GameObject)Instantiate(currentobject.prefab, currentpos, Quaternion.Euler(currentrot));
            NetworkServer.Spawn(prefab);
        }
    }
}

[System.Serializable]
public class buildObjects
{
    public string name;
    public GameObject prefab;
    public GameObject preview;
    public int Gold;
}