First steps with Unity and Photon

First Step: setup the multi-user project and check it is working

• Create a new "3D Core" Unity project

• Import some XR Packages into your Unity project (Window / Package Manager):

  • "XR Interaction Toolkit" and its samples

    • it will import automatically "XR Core Utilities" and "XR Legacy Input Helpers"

  • "XR Plugin Management" and its samples

• Import this package into your Unity project: RVC2023.unitypackage

  • Assets / Import Package / Custom Package...

  • It includes Photon2 and will allow joining an existing server

  • If you lose  the photon server address, here it is: ff3bcfc7-ff4e-4689-8acc-7532edc10870

• Give a new number version to your project:

  • To avoid conflicts between all your projects (it is not the best way do do that, but it can be enough for this practical work...)

  • Assets/Photon/PhotonUnityNetworking/Resources/PhotonServerSettings:

    • Settings : App Version

  • Add the two scenes from the "Resources/Networking" directory in the "Build Settings" (the launcher must be the first one):

    • Launcher.Unity

    • Arena

  • In the "Resolution and Presentation" section, change the "Fullscreen Mode" to "Windowed" with a 800x600 resolution:

    • in "Build Settings" / "Player Settings..." / "Resolution and Presentation"

  • Build the app, and run it at least twice for two different users:

    • You can also use only one build, and execute the second client directly in Unity

Second Step: look at the physical interactions

• To make it possible to push the cubes...

  • There is a Rigid Body and Box Collider

    • In the "NavigationRig" prefab (declared in the "Assets/Resources" directory)

      • With a freeze of the position and orientation of the avatar

• Try to push a cube with a player…

  • Do the cubes move for all the users?

  • In the same way?

  • Try to understand why...

• Next, you will have to create a "SharedObject" prefab based on one of the cubes, to avoid to repeat manual changes to each of them

  • Drag the Cube1 object in the Assets/Ressources window and change its name

  • Replace the previous cubes by 3 instances of this new prefab

  • Change the colors of 2 of them to recreate the initial situation

Third Step: share the moves of the cubes

• Add networking attributes to the cubes

  • A PhotonTransformView

  • A PhotonView:

    • That will observe the PhotonTransformView

    • Observe option: Unreliable On Change

  • Try and see what happens:

    • Do the cubes move exactly in the same way for all the players?

    • Try to understand why!