C++ crash when using GetBodyInstance() for anything with Skeletal Mesh

Development Programming & Scripting C++
1

Hi guys!

I am having a bit of an issue with Skeletal Meshes when using C++. Basically, I am noticing that whenever I try to access GetBodyInstance() in a Skeletal Mesh, it crashes the editor.

Here is an example line of code:

myMeshActor->GetBodyInstance()->bLockYTranslation = 1;

That line is inside a function that gets called by blueprint and it instantly crashes the editor. Anything I try to access in GetBodyInstance() crashes the editor. Both Visual Studio and Xcode compile it just fine.

Here is some example code I made to try solving this:

==========

Header:

UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = “Meshes”)
USkeletalMeshComponent* myMeshActor = CreateDefaultSubobject<USkeletalMeshComponent>(TEXT(“My_Mesh”));

UFUNCTION(BlueprintCallable, Category = “Testing”)
void setMeshProperties();

==========

CPP:

static ConstructorHelpers::FObjectFinder<USkeletalMesh> myMeshActor_Visual(TEXT("/Game/Meshes/myMesh"));
if(myMeshActor_Visual.Succeeded())
{
myMeshActor->SetSkeletalMesh(myMeshActor_Visual.Object);
}

void AmyMeshActor::setMeshProperties()
{
myMeshActor->GetBodyInstance()->bLockYTranslation = 1; //This causes crash

}

Any idea if I am trying to access it wrong?

I have also tested this issue with a Static Mesh and that does NOT cause a crash. No idea why. Thank you in advance.

2

Skeletal Meshes unlike all other primitives often have multiple body instances, and each of those has a unique Name. Unless you have a body on the root bone of the mesh, then calling that function will always return null.

3

Bingo! Did not know that. Can you specify further what you mean though? What do you mean by body on the root bone? I should have mentioned that this is an actor class I am working with, not a character class. And thanks again!

4

I think I got it figured out but I will post back.

5

Having some trouble still. I now do have a body on the root bone but it is still returning NULL.