Note that I ran the exact same code under 4.4 and there was no problem. I even set up a clean project. Still there is the problem. So far I have found out that the line which causes the crash did not change between 4.4 and 4.5. Therefore there must have been a change about OwnerComponent.
I somehow got this working again I will report back when I find out why
is my code:
//TestBAse.m just a regular actor
#include "InstancedTest.h"
#include "TestBAse.h"
#include "MyStaticMeshActor.h"
ATestBAse::ATestBAse(const class FPostConstructInitializeProperties& PCIP)
: Super(PCIP)
{
}
void ATestBAse::BeginPlay()
{
FActorSpawnParameters SpawnInfo;
//SET NO COLLISION FAIL TO TRUE
SpawnInfo.bNoCollisionFail = true;
SpawnInfo.Owner = nullptr;
AMyStaticMeshActor* NewVertex =
GetWorld()->SpawnActor<AMyStaticMeshActor>(
AMyStaticMeshActor::StaticClass(),
FVector(0,0,0),
FRotator::ZeroRotator,
SpawnInfo
);
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//Mesh
//NewVertex->InstancedStaticMeshComponent->SetStaticMesh(VictoryEngine->AssetSM_EngineCube);
//Add Core Instance
for (int32 x = 0; x < 80; x++)
{
for (int32 y = 0; y < 80; y++)
{
FVector2D jea = FVector2D(x, y);
FTransform newT = NewVertex->GetTransform();
newT.SetLocation(FVector(x*200, y*200, 0));
NewVertex->InstancedStaticMeshComponent->AddInstance(newT);
}
}
//Scale
NewVertex->SetActorRelativeScale3D(FVector(1,1,1));
}
//MyStaticMeshActor.cpp Just copied over from ramas post
#include "InstancedTest.h"
#include "MyStaticMeshActor.h"
AMyStaticMeshActor::AMyStaticMeshActor(const class FPostConstructInitializeProperties& PCIP)
: Super(PCIP)
{
//Mesh
static ConstructorHelpers::FObjectFinder<UStaticMesh> StaticMeshOb_torus(TEXT("StaticMesh'/Engine/EngineMeshes/Cube.Cube'"));
SMAsset_Cube = StaticMeshOb_torus.Object;
//create new object
InstancedStaticMeshComponent = PCIP.CreateDefaultSubobject < UInstancedStaticMeshComponent >(this, TEXT("InstancedStaticMeshComponentCOMP"));
InstancedStaticMeshComponent->AttachTo(RootComponent);
//Not Made some reason?
if (!InstancedStaticMeshComponent) return;
//~~~~~~~~~~~~~~~~~~~~~~~~
//Set to Asset
InstancedStaticMeshComponent->SetStaticMesh(SMAsset_Cube);
InstancedStaticMeshComponent->bOwnerNoSee = false;
InstancedStaticMeshComponent->bCastDynamicShadow = false;
InstancedStaticMeshComponent->CastShadow = false;
InstancedStaticMeshComponent->BodyInstance.SetObjectType(ECC_WorldDynamic);
//If i make this below, it crashes after one instance with the same error although when checking it is not null
InstancedStaticMeshComponent->BodyInstance.OwnerComponent = Cast<UPrimitiveComponent>(InstancedStaticMeshComponent);
//Visibility
InstancedStaticMeshComponent->SetHiddenInGame(false);
//Mobility
InstancedStaticMeshComponent->SetMobility(EComponentMobility::Movable);
//Collision
InstancedStaticMeshComponent->BodyInstance.SetCollisionEnabled(ECollisionEnabled::QueryOnly);
InstancedStaticMeshComponent->BodyInstance.SetObjectType(ECC_WorldDynamic);
InstancedStaticMeshComponent->BodyInstance.SetResponseToAllChannels(ECR_Ignore);
InstancedStaticMeshComponent->BodyInstance.SetResponseToChannel(ECC_WorldStatic, ECR_Block);
InstancedStaticMeshComponent->BodyInstance.SetResponseToChannel(ECC_WorldDynamic, ECR_Block);
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
if (!StaticMeshComponent) return;
//Mobility
StaticMeshComponent->SetMobility(EComponentMobility::Movable);
//Collision
StaticMeshComponent->BodyInstance.SetCollisionEnabled(ECollisionEnabled::QueryOnly);
StaticMeshComponent->BodyInstance.SetObjectType(ECC_WorldDynamic);
StaticMeshComponent->BodyInstance.SetResponseToAllChannels(ECR_Ignore);
StaticMeshComponent->BodyInstance.SetResponseToChannel(ECC_WorldStatic, ECR_Block);
StaticMeshComponent->BodyInstance.SetResponseToChannel(ECC_WorldDynamic, ECR_Block);
}
Note that both .h have nothing in them except the pregenerated stuff.
I am pretty confident that this is a bug as other people experience it as well
This does not happen when using blueprints, so I am going to investigate that
I echo this problem. It did not effect my build in 4.4, but crashes now in 4.6 immediately after adding a third instance to a static mesh. My code is very similar to the above. Does anyone know the answer to this?
Please do report back when you figure out how to get this working. My project is relatively stuck (at 1FPS) until I can get instanced static mesh components again.
Also, just a heads-up, it’s way easier to keep track of what’s going on in the thread if you add new comments when you have something new to say as opposed to editing the original post. Thanks!
I am having this problem, though in my case, I am in blueprint.
While in the editor, it works great (I use Add Instance Static Mesh Component followed by calls to AddInstance in the Constructor Script), but as soon as I press play, I received the “FromInst->OwnerComponent.Get() == NULL” assertion error.
I’m running 4.6.1, and changing the AddInstancedStaticMeshComponent with AddStaticMeshComponent does not have any problems.
Note: I realize this is a c++ post, but I thought it might be related.
I have this issue as well i have one class with the instance component works perfectly no problems. And in a derived class of the same class (Same Code).
It crashes on the 3rd instance added.
Did some more testing and now both class are running same code no difrence.
Only difrence now is the static mesh and that the one that works is the root component on the class/ BP.
Edit:
Is the code that’s working for you (in
one class) functionally similar to
what’s in the original post?
All collision stuff is setup in the constructor.
When adding i only use AddInstanceToWorldSpace()
And the ones that crashes are attach to that parent every thing else is the same.
Also i get this crash if i try exiting PiE with one or two of them in the scene.
Assertion failed:
!HasValidPhysicsState()
[File:D:\BuildFarm\buildmachine_++depot+UE4-Releases+4.6\Engine\Source\Runtime\Engine\Private\ActorComponent.cpp]
[Line: 833] Failed to destroy physics
state (InstancedStaticMeshComponent
/Game/UEDPIE_0
I also concur this. Crash in UInstancedStaticMeshComponent::CreateAllInstanceBodies → UInstancedStaticMeshComponent::InitInstanceBody → FBodyInstance::CopyBodyInstancePropertiesFrom assert on check(FromInst->OwnerComponent.Get() == NULL);
Happens when adding 3rd instance. Doing through c++. What’s really bizarre is that it does not happen for each static mesh, only for some.
This is obviously a pretty big issue judging by the amount of responses; can we please get some Epic feedback?
I found this thread while searching for the assert failure, and but am experiencing it with a strictly blueprint set up (prototyping in BP, blah blah).
Thanks to 's comment above, I was able to realize that only the instanced mesh set as the ROOT component would work to an arbitrary number of instances; unchecking AutoWeld on the StaticMesh properties allowed me to use any of the components.
Again, I’m not doing any of this in the code right now, but it fixed the issue in BP. Whether this fix creates further issues is to be seen!
This is great news i am strugeling to find the AutoWeld setting you are talking about.
Could you please direct me the proper location.
Checkt both settings in the Static Mesh Editor and Instanced STatic Mesh Components on my actor.
Am i just blind or is it some where else?
Edit:
I did find InstancedStaticMeshComponent->UnWeldFromParent(); this it?
The Auto Weld option is in the Blueprint window, Components view, in the Physics category for each of the components. My Blueprint’s parent class is Actor.h, and has a Root component of Instanced Static Mesh, and three additional components of Instanced Static Mesh.
I’m not sure about in code; a quick find all on the source shows bAutoWeld is a uprop in the FBodyInstance class; StaticMeshComponent’s constructor uses GetBodyInstance()->bAutoWeld = true; to turn on static mesh welding by default.
