Help! Getting the WorldContext Object for Kismet Library?

Development Programming & Scripting
1

I need help because I can´t find this anywhere.

I want to call some functions from the Kismet Rendering Library from code.
But they always expect a UObject* WorldContextObject! What is this and how can I get it?

I tried the following code after I searched for WorldContext, but it does not work =(

	UObject* WorldContext = GEditor->GetEditorWorldContext();
	UCanvas* Canvas;
	FVector2D Size;
	FDrawToRenderTargetContext Context;
	UKismetRenderingLibrary::BeginDrawCanvasToRenderTarget(WorldContext, TextureTarget, Canvas, Size, Context);

Because a FWorldContext cannot be converted to a UObject. So what exactly does the Kismet Library want??

Thanks for any help!

2

Hello!

The UObject* WorldContextObject is just any UObject the Static function can get the UWorld from. So if you’re calling it from an AActor, giving it this would do.

UObject* someValidWorldContext = this; // assuming you're calling this on a UObject and not some abstract class.

Usualy those static functions which are called BlueprintCallable, which require a WorldContextObject, doesn’t show it in blueprint because they have a meta specifier meta = (WorldContext = "WorldContextObject") which lets them retrieve world from whatever actor they’re in, basically auto fills the world context with this.

3

Ah thanks for the answer.
Does it need to be an Actor, or is a Component equivalent?
Because my class is derived from SceneCaptureComponent2D. And I already tried calling the Kismet function with this, but it did not work - I thought it was because of the wrong WorldContext Object…

4

The goal is to get the UWorld. And Components aren’t derived from AActor, but from ActorComponent.

In this case i would use “GetOwner()” instead of “this”. assuming the owner is an Actor though.

5

In fact, this works fine.

But I was calling it with the TextureTarget not being initialized, which was the reason the Kismet function failed. And appearantly I did a really bad job at debugging, thats why I did not find out earlier xD

But thanks for you explanation! I did really get confused about this though :wink: