Runtime InstancedStaticMesh Navigation problem

Development Programming & Scripting C++
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1

Hi, I Am working with instanced static mesh, spawn the components and fill them in game, everything work fine but navmesh ignore the components, if i run the code in editor the navmesh work correctly.
how do I make sure navmesh doesn’t ignore the UInstancedStaticMeshComponent created at runtime?

StaticInstancesComponent[i] = NewObject<UInstancedStaticMeshComponent>(this, UInstancedStaticMeshComponent::StaticClass(), FName(String));
		if (!StaticInstancesComponent[i])
			return;
		StaticInstancesComponent[i]->RegisterComponent();
		StaticInstancesComponent[i]->AttachToComponent(RootComponent.Get(), FAttachmentTransformRules::KeepWorldTransform);
		StaticInstancesComponent[i]->CreationMethod = EComponentCreationMethod::Instance;
		StaticInstancesComponent[i]->SetStaticMesh(StaticInstancesArray[i].StaticMesh);
		StaticInstancesComponent[i]->SetMobility(EComponentMobility::Movable);
		StaticInstancesComponent[i]->SetCollisionProfileName(FName("BlockAllDynamic"));
		StaticInstancesComponent[i]->SetCanEverAffectNavigation(true);
		this->AddInstanceComponent(StaticInstancesComponent[i]);

		StaticInstancesComponent[i]->AddInstances(StaticInstancesArray[i].Transform, false, true);
		StaticInstancesComponent[i]->SetWorldLocation(FVector(0));

I’m using Invoker with Runtime Generation Dynamic

EditorGenerationInGame
EditorGenerationInGame1317×917 50.2 KB

InGameGeneration
InGameGeneration1289×865 49.1 KB

2

Howdy malock89, welcome back and thank you for posting.

The concern may be due to your navigation settings. I found a relevant thread that may provide more help. Its discusses changing your navigation settings. In UE5, I believe, you may want this set to Dynamic.

I hope this helps.

3

Thanks, i have set the runtime generation to dynamic and checked generate navigation only around navigation invoker .
I notice that if i press play, f8, than move the instances, the navmesh start to work on them too.
then I found a partial solution forcing the navmesh to update the instancedStaticMeshComponent toggling SetCanEverAffectNavigation(already set to true) after the begin play

StaticInstancesComponent[i]->SetCanEverAffectNavigation(0); StaticInstancesComponent[i]->SetCanEverAffectNavigation(1);

I don’t find this solution very clean but it work now

4

I guess calling RegisterComponent(); at the end would fix the problem. its even more logical.

5

Must be careful not to call AddInstances() before RegisterComponent(), this will crash the engine. However even calling it at the end does not solve the problem