4.21 vehicle rotate jitter in network

Development Programming & Scripting Multiplayer & Networking
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1

I use vehicle project in ue4.21

when run the project by check run dedicate server,

go forward or back is well,but when rotate the car, it well be jitter terribly

2

I have the same issue…

3

i have a temp solution,
custom class physicReplication, override function OnTick and SetReplicatedTarget

ChariotPhysiscReplication.h

#include "CoreMinimal.h"
#include "PhysicsPublic.h"
#include "PhysicsReplication.h"
#include "PhysicsInterfaceUtils.h"

/**
 * 
 */
class CHARIOTGAME_API FChariotPhysiscReplication : public FPhysicsReplication
{
public:
	FChariotPhysiscReplication(FPhysScene* PhysScene);
	
protected:
	virtual void OnTick(float DeltaSeconds, TMap<TWeakObjectPtr<UPrimitiveComponent>, FReplicatedPhysicsTarget>& ComponentsToTargets);
	
	virtual void SetReplicatedTarget(UPrimitiveComponent* Component, FName BoneName, const FRigidBodyState& ReplicatedTarget);
	
	bool bUpdatePos;
};

class CHARIOTGAME_API FChariotPhysicsReplicationFactory : public IPhysicsReplicationFactory
{
public:
	FChariotPhysicsReplicationFactory();

	virtual FPhysicsReplication* Create(FPhysScene* OwningPhysScene) override;
	virtual void Destroy(FPhysicsReplication* PhysicsReplication) override;
};

ChariotPhysiscReplication.cpp

// Fill out your copyright notice in the Description page of Project Settings.

#include "ChariotPhysiscReplication.h"

#include "PhysicsEngine/PhysicsSettings.h"

FChariotPhysiscReplication::FChariotPhysiscReplication(FPhysScene* PhysScene)
	: FPhysicsReplication(PhysScene)
{
}



void FChariotPhysiscReplication::OnTick(float DeltaSeconds, TMap<TWeakObjectPtr<UPrimitiveComponent>, FReplicatedPhysicsTarget>& ComponentsToTargets)
{
	if (bUpdatePos)
	{
		bUpdatePos = false;
		FPhysicsReplication::OnTick(DeltaSeconds, ComponentsToTargets);
	}
	

}



void FChariotPhysiscReplication::SetReplicatedTarget(UPrimitiveComponent * Component, FName BoneName, const FRigidBodyState & UpdatedState)
{
	FPhysicsReplication::SetReplicatedTarget(Component, BoneName, UpdatedState);
	bUpdatePos = true;
	
}


FChariotPhysicsReplicationFactory::FChariotPhysicsReplicationFactory()
{
}

FPhysicsReplication* FChariotPhysicsReplicationFactory::Create(FPhysScene* OwningPhysScene)
{
	return new FChariotPhysiscReplication(OwningPhysScene);
}

void FChariotPhysicsReplicationFactory::Destroy(FPhysicsReplication* PhysicsReplication)
{
	delete PhysicsReplication;
}

use physic in gameinstance,cpp yourself

void UChariotGameInstance::Init()
{
	Super::Init();
	
	FPhysScene::PhysicsReplicationFactory = MakeShareable(new FChariotPhysicsReplicationFactory());
}

Config DefaultEngine.ini

[/Script/Engine.PhysicsSettings]
PhysicErrorCorrection=(PingExtrapolation=0.100000,PingLimit=100.000000,ErrorPerLinearDifference=1.000000,ErrorPerAngularDifference=1.000000,MaxRestoredStateError=1.000000,MaxLinearHardSnapDistance=400.000000,PositionLerp=0.050000,AngleLerp=0.10000,LinearVelocityCoefficient=0.200000,AngularVelocityCoefficient=0.628319,ErrorAccumulationSeconds=1.000000,ErrorAccumulationDistanceSq=3.000000,ErrorAccumulationSimilarity=100.000000)

this is useful for me!

1 Like
4

I had the same issue with an AWheeledVehicle actor smoothly replicating linear motion but snapping its rotation, especially at lower speeds. I solved the issue by increasing the Rotation Quantization Level on the actor’s Replicated Movement from Byte Components to Short Components. I’ve only tested this fix in PIE with simulated latency.