I'm working on and learning some basics of Unity 5, UNET, and networking. I made a simple 3D game where you go around and change the colors of objects. But I want to make it multiplayer now, and I am having lots of trouble figuring out how to send the changes over the network so all players can see a single player's color change.
Part of the issue is that it has been difficult to find the answer using the newer UNET networking engine. And sometimes I come across answers that are for the older way.
So the main question is, how do I network non-player GameObject property changes? Color, shape, size, etc..
Here is some code I have now - and I've had many different versions so I'll just post the current one:
using UnityEngine;
using System.Collections;
using UnityEngine.Networking;
public class Player_Paint : NetworkBehaviour {
private int range = 200;
[SerializeField] private Transform camTransform;
private RaycastHit hit;
[SyncVar] private Color objectColor;
[SyncVar] private GameObject objIdentity;
void Update () {
CheckIfPainting();
}
void CheckIfPainting(){
if(Input.GetMouseButtonDown(0)) {
if (Physics.Raycast (camTransform.TransformPoint (0, 0, 0.5f), camTransform.forward, out hit, range)) {
string objName = hit.transform.name;
CmdPaint(objName);
}
}
}
[ClientRpc]
void RpcPaint(){
objIdentity.GetComponent<Renderer>().material.color = objectColor;
}
[Command]
void CmdPaint(string name) {
objIdentity = GameObject.Find (name); //tell us what was hit
objectColor = new Color(Random.value, Random.value, Random.value, Random.value);
RpcPaint ();
}
}
I've tried a bunch more solutions, including writing a separate script on the objects whose color I want to change and including [SyncVar] and hook functions. I've also tried Debug.Log on each of the functions I'm expecting to update the objects on the clients and they are executing with the expected data.
I really don't know what else to do. I feel like it is a VERY simple thing I want to do, but I haven't come across syncing non-player GameObject's in any questions, tutorials, or other resources. Any ideas at all would be helpful, thank you.
I found my answer. And it was very difficult, as almost every single question, post, example, etc... I could find was about player objects, and not non-player objects.
So, I needed to use the AssignClientAuthority
function. Which I had tried a couple of times, but wasn't using it correctly. Here is the functioning C# script to apply to the player:
using UnityEngine;
using System.Collections;
using UnityEngine.Networking;
public class Player_Paint : NetworkBehaviour {
private int range = 200;
[SerializeField] private Transform camTransform;
private RaycastHit hit;
[SyncVar] private Color objectColor;
[SyncVar] private GameObject objectID;
private NetworkIdentity objNetId;
void Update () {
// only do something if it is the local player doing it
// so if player 1 does something, it will only be done on player 1's computer
// but the networking scripts will make sure everyone else sees it
if (isLocalPlayer) {
CheckIfPainting ();
}
}
void CheckIfPainting(){
// yes, isLocalPlayer is redundant here, because that is already checked before this function is called
// if it's the local player and their mouse is down, then they are "painting"
if(isLocalPlayer && Input.GetMouseButtonDown(0)) {
// here is the actual "painting" code
// "paint" if the Raycast hits something in it's range
if (Physics.Raycast (camTransform.TransformPoint (0, 0, 0.5f), camTransform.forward, out hit, range)) {
objectID = GameObject.Find (hit.transform.name); // this gets the object that is hit
objectColor = new Color(Random.value, Random.value, Random.value, Random.value); // I select the color here before doing anything else
CmdPaint(objectID, objectColor); // carry out the "painting" command
}
}
}
[ClientRpc]
void RpcPaint(GameObject obj, Color col){
obj.GetComponent<Renderer>().material.color = col; // this is the line that actually makes the change in color happen
}
[Command]
void CmdPaint(GameObject obj, Color col) {
objNetId = obj.GetComponent<NetworkIdentity> (); // get the object's network ID
objNetId.AssignClientAuthority (connectionToClient); // assign authority to the player who is changing the color
RpcPaint (obj, col); // usse a Client RPC function to "paint" the object on all clients
objNetId.RemoveClientAuthority (connectionToClient); // remove the authority from the player who changed the color
}
}
!!!Important!!! Each object that you want to affect must have a NetworkIdentity component, and it must be set to LocalPlayerAuthority
So this script is just to change a random color, but you should be able to change the actual stuff to apply this to any change in the materials or anything else you want to network with a non-player object. "Should" being the optimal word - I haven't tried with any other functionality yet.
EDIT - added more comments for learning purposes.