sinclair and synchro hooks are going to be a utility of mirror. You will be using frequently. They are used to keep variables synchronized on objects across the network, either to all clients or the owning client. To begin, I have an object which is acting as the player prefab. This is the object that spawns when I connect. In demonstrating the sync very logic on this object, I have a sprite renderer, which I'll change the color of to demonstrate the sync fair. I have a network identity, so this is a networked object, and I have a sync fair demo script. And note the sync mode is set to observers. So in this example, I'd be synchronizing to all clients. I'm going to open up the sync fair demo script. Up top, I have a field named underscore color. It is of type color 32. And just above that, I have a sync there attribute. This indicates that this will be a sync there, meaning it will be synchronized over the network automatically. Notice the properties hook equals name of

set color. Set color is the method which will be called on clients after the server updates to sync their value. If you do not need to know when a sync fair updates on clients, you can simply leave the hook part out and just use syncfare as demonstrated here. It's important to remember that syncvir will update automatically on clients, but only if you change the value on the server. In addition, if a new player joins later in the game, they'll receive that updated value as well, and the hook will call too. Going down to set color, you can see that it has two parameters. The first one is old color, the second is new color. You can name these whatever you like, however, the first entry will always be the old value before the change, and the second entry will be the new value. And again, keep in mind that this is called from the hook, so this will be called on clients only. In this method, when I receive the hook, so meaning that the color value has changed, I will get the sprite renderer on this object, and I will set the renderer color.

to the new color. Like I said before, you'll have to set the value on the server for it to synchronize to clients. So, onStartServer, I am starting curating randomize color that's just down here. This will run indefinitely. It will wait a few seconds, and it will change the color field to a random color. And since that color field is a sync var, it will update automatically to clients. Now that you've seen the script, let's see this code in action. I have a buildup, and on the build, I'm going to run this as a server. And since this is a server only, you won't see the sprite render until a player joins, since that is a player object. So, I'm going to go ahead and connect a client. As discussed, the server is changing the color every two seconds, and then that is being updated to clients. Notice that the sprite render is updating on the client, but it's not on the server. As mentioned before, the hook will only call on clients, including client host. As you can see in the code, I'm not actually updating a sprite.

renderer color in the curating, which is running on the server. The server updates the field, which will update the sync for on clients. And if a hook is present, they'll call on the clients as well.

Unity Multiplayer With Mirror - SyncVar and SyncVar Hook (Freebie)

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