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Fix replicated physics actors falling through floor on late-joining clients

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This commit is contained in:
Steve Streeting 2023-12-07 14:48:34 +00:00
parent 50f788762e
commit e8aec1fd24
2 changed files with 16 additions and 3 deletions
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17
Source/StevesUEHelpers/Private/StevesReplicatedPhysicsActor.cpp
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@ -3,7 +3,7 @@
#include "StevesReplicatedPhysicsActor.h"
AStevesReplicatedPhysicsActor::AStevesReplicatedPhysicsActor()
AStevesReplicatedPhysicsActor::AStevesReplicatedPhysicsActor(const FObjectInitializer& ObjInit)
{
PrimaryActorTick.bCanEverTick = false;
@ -13,6 +13,8 @@ AStevesReplicatedPhysicsActor::AStevesReplicatedPhysicsActor()
const auto MeshComp = GetStaticMeshComponent();
MeshComp->SetMobility(EComponentMobility::Movable);
MeshComp->SetCollisionObjectType(ECC_WorldDynamic);
// I think this is actually not needed, since on clients the role is ROLE_SimulatedProxy not ROLE_AutonomousProxy
// When using ROLE_SimulatedProxy physics is replicated all the time
MeshComp->bReplicatePhysicsToAutonomousProxy = true;
// We do NOT replicate MeshComp itself! That's expensive and unnecessary
@ -36,8 +38,19 @@ void AStevesReplicatedPhysicsActor::BeginPlay()
}
else
{
// Ignore all collisions on client
// We're on a client so will be receiving replicated physics
// Ignore all collisions; if we don't do this, things jank because of conflicting collisions
MeshComp->SetCollisionResponseToAllChannels(ECR_Ignore);
// We DON'T disable physics. Physics still needs to be enabled for replicated physics to be respected.
// Otherwise objects will not move on the client.
// There's one case where this is problematic: replicated physics actors that are already asleep
// once a new client joins a game in-progress will locally simulate themselves through the floor, because no further
// updates will be received about their physics from the server.
// My solution is to start all objects asleep on the client; if they're not, the server will send updates and
// the objects will wake up. If they're asleep on the server, we're good.
MeshComp->PutAllRigidBodiesToSleep();
}
Super::BeginPlay();

2
Source/StevesUEHelpers/Public/StevesReplicatedPhysicsActor.h
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@ -15,7 +15,7 @@ class STEVESUEHELPERS_API AStevesReplicatedPhysicsActor : public AStaticMeshActo
GENERATED_BODY()
public:
AStevesReplicatedPhysicsActor();
AStevesReplicatedPhysicsActor(const FObjectInitializer& ObjInit);
protected:
virtual void BeginPlay() override;