hzFishy's Game Dev Notes

Character Movement Component

The CMC is placed in Networking because most of the important parts and difficulties occurs when you need replication and prediction.

Resources

Optimizing

Partial Breakdown

When walking, when you move (or tick?) CMC will eventually run the following:

  • StartNewPhysics calls PhysWalking (only call of PhysWalking)
    • PhysWalking calls MoveAlongFloor
      • MoveAlongFloor calls SafeMoveUpdatedComponent
        • SafeMoveUpdatedComponent will run checks and eventually call MoveUpdatedComponentImpl, which calls MoveComponent on UpdatedComponent (by default it is the root, which is the capsule component)
      • Then, here it checks if we are stuck or not. And if its a another ramp (using Normal hit) or wall/barrier.

Client to listen server animation issues

It seems that the listen server can see client character animations lag, this is because by default clients send data to the server at a high frequency (because clients may have a high framerate). To fix this the idea is to cap the max update frequency.

(thanks to Kaos)

DefaultGame.ini
[/Script/Engine.GameNetworkManager]
TotalNetBandwidth=960000
MaxDynamicBandwidth=120000
MinDynamicBandwidth=45000
ClientAuthorativePosition=false
ClientErrorUpdateRateLimit=0.015f
MAXCLIENTUPDATEINTERVAL=0.25f
MAXPOSITIONERRORSQUARED=6.f
MaxClientForcedUpdateDuration=1.f
ServerForcedUpdateHitchThreshold=0.150f
ServerForcedUpdateHitchCooldown=0.100f
MaxMoveDeltaTime=0.125f
ClientNetSendMoveThrottleOverPlayerCount=3
ClientNetSendMoveDeltaTime=0.0166f
ClientNetSendMoveDeltaTimeThrottled=0.0222f
ClientNetSendMoveDeltaTimeStationary=0.0166f
ClientNetSendMoveThrottleAtNetSpeed=60000
bMovementTimeDiscrepancyDetection=false
bMovementTimeDiscrepancyResolution=false
MovementTimeDiscrepancyMaxTimeMargin=0.25f
MovementTimeDiscrepancyMinTimeMargin=-0.25f
MovementTimeDiscrepancyResolutionRate=1.0f
MovementTimeDiscrepancyDriftAllowance=0.05f
bMovementTimeDiscrepancyForceCorrectionsDuringResolution=true
ClientNetCamUpdateDeltaTime=0.066f
BadPingThreshold=200
SeverePingThreshold=500
BadPacketLossThreshold=0.05
SeverePacketLossThreshold=0.15
 
[/Script/Engine.Player]
ConfiguredInternetSpeed=60000
ConfiguredLanSpeed=60000
 
[/Script/SteamSockets.SteamSocketsNetDriver]
NetConnectionClassName=/Script/SteamSockets.SteamSocketsNetConnection
ReplicationDriverClassName="/Script/TwinStick.RTS_ReplicationGraph"
ConnectionTimeout=80.0
bNeverApplyNetworkEmulationSettings=true
InitialConnectTimeout=120.0
NetServerMaxTickRate=60
bClampListenServerTickRate=true
MaxNetTickRate=30
KeepAliveTime=0.2
MaxClientRate=120000
MaxInternetClientRate=120000
RelevantTimeout=5.0
SpawnPrioritySeconds=2.0
ServerTravelPause=4.0