Lag compensation demo with a minimal "shooter" example using the General Movement Component (GMC) plugin for UE5. Source project available for download on GitHub at github.com/dolphineye74/GMC-LagCompensationDemo

How does it work?

The Fire input is detected in the movement component. When that happens, the client start simulating the shoot, perform all the traces (pink color).

The fire event is attached to the move as the WantsToFire variable is bound via GMC. When the server executes the move the player was executing when he fired, he can replay the shooting, and perform the appropriate traces too (green color).

Using this technique is efficient, as when the server is playing a move, the other players' position will be automatically rewinded at the move's timestamp.

However, when using the default settings of the GMC component, you might realize that past a certain distance between the player and target, the rewinding will no longer occur. This happens due to the Server Pawn Rollback Radius property (in the Advanced settings of the GMC) being too small. Hence, past this radius, the server won't rewind the potential targets. In this demo, we set the value of Server Pawn Rollback Radius to the Biped's Net Cull Distance.

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