Adding multiplayer networking

To make the scene run as multiplayer we need, at a minimum, a Network Manager component, and we need to identify any objects that will get spawned using the Network Identity component.

Network Manager and HUD

First, we'll add the Network Manager component, as follows:

1. Navigate to GameObject | Create Empty and rename it NetworkController.

2. Navigate to Add Component | Network | Network Manager.

3. Navigate to Add Component | Network | Network Manager HUD.

We also added a Network Controller HUD menu, a crude default menu that Unity offers to select the runtime networking options (you can see it in the images that follow). It's for development. In a real project, you'll probably replace the default HUD with something more appropriate.

Network Identity and Transform

Next, add a Network Identity to the Avatar prefab. We will also add a Network Transform, which instructs the networking system to synchronize the player's Transform values to the avatar instances on each client,...