Parallel Worlds is a multiplayer online game built on top of the Merry Fragmas 3.0 tutorial series from Unity Live Sessions. Besides the classic FPS mechanics, players can switch between two different worlds (a brighter one and a darker one) by pressing the right mouse button. This project has been developed with Unity3D 2017.2.0f3.

Please note that this is just a tech demo of my knowledge in graphics programming and gameplay programming on Unity, not a full game, so I mainly focused on the world swapping feature, leaving the rest of the game features to future development and polishing tasks.

Here are the instructions to test the game on the same machine using a standalone build as a host and the Unity editor as a client:

1. Open the project with Unity, File->Build & Run. Choose filename for your standalone build and hit Save
2. Once done building, press Play! in the ParallelWorlds Configuration window;
3. Once the game is running, type a name for your game room under CREATE A GAME and press CREATE;
4. (Optional) choose a color and a name for the hosting player;
5. Back on Unity, open scene Lobby, in Assets/_Scenes and press play on the editor;
6. Once the game is running, press LIST SERVERS and hit JOIN next to the game room you created.
7. (Optional) choose a color and a name for the client player;
8. In the lobby, press the JOIN button;
9. On the standalone build, in the lobby, press the JOIN button;

1. Both universes (as the worlds are called in code) exist at the same: the main scene (corrisponding to universe A) load additively universe B on awake. The universe swapping logic, located in the PlayerUniverse component, manages each player's universe state and handles the transition process between universes. See comments on top of the PlayerUniverse class for more details.
2. The swap effect on the local player side has been made by animating the camera FOV and by adding a custom post-processing vignette effect combined with a color saturation through a vertex/fragment shader.
3. The swap effect on the remote players has been made using a surface shader that progressively dissolve (clip) the model's fragments based on a uniform parameter and a dedicated texture. Also, a colored edge is shown based on a LUT.