Black Prediction

This is a client side prediction and server reconciliation plugin for Mirror. It is a completely server authoritative movement solution.

Feature

Client side prediction.
Server reconciliation.
The client only rolls back states when there is a mismatch between client and server states.
Once a mismatch occurs, the client applies that state to the controller and replays the inputs starting after that state's frame. All old inputs before that get discarded.
The server simulates all controllers in one frame and a single input per frame.
Speedhack proof.
Supports both default Unity CC and KCC.

KCC is a paid asset, so I can not include the files for it directly but the example for it might be added soon.

Make a build.
Host from the build and join as a client inside the editor.
Start moving around on the client. Notice how it is very smooth.
Modify the client's player prefab and change the speed for movement and jump.
Realize that it gets snapped back to the position that it belongs to according to the server.
Add the latency simulation script inside of the NetworkManager transport field to see how it works through latency.

Open AuthoritativeCharacterData.cs
Add in desired player inputs inside of the ClientInput struct and desired player physics results inside of the ServerResult struct.
DO NOT edit AuthoritativeCharacterMotor.cs and AuthoritativeCharacterSystem.cs unless you know what you are doing.
Create your player movement script and make it derive from the AuthoritativeCharacterMotor.cs script.
Add all the required function overrides and follow ExampleCharacterController.cs inside the example folder to see how it should be implemented.
Make your own player prefab for it, add Network Identity, NetworkTransform, and your playerMovement script on it, and then throw it in the NetworkManager script in the start scene.
Make a new GameObject in your game scene with NetworkIdentity and AuthoritativeCharacterSystem script on it.
Play and test how it works.

Rotation appears to be completely messed up when using the default Unity controller. This is being looked into.

No promises.

Add custom network time and frame management.
Add interpolation for reconciliation.
Add first person view.
Make it rotate properly. The default Unity controller is not great at handling positional and rotational data.
Add Rigidbody support.
Add editor helper so the user does not need to edit the scripts directly.
Add performance checks to save bandwidth.
Support non-mirror networking solutions.

uwu