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> Unreal Engine API Reference > Runtime > Engine > Engine > FWorldAsyncTraceState

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FWorldAsyncTraceState

This encapsulate World's async trace functionality.

Windows

MacOS

Linux

References

Module	Engine
Header	/Engine/Source/Runtime/Engine/Classes/Engine/World.h
Include	#include "Engine/World.h"

Syntax

struct FWorldAsyncTraceState

Remarks

This encapsulate World's async trace functionality. This contains two buffers of trace data buffer and alternates it for each tick.

You can use async trace using following APIs : AsyncLineTrace, AsyncSweep, AsyncOverlap When you use those APIs, it will be saved to AsyncTraceData FWorldAsyncTraceState contains two buffers to rotate each frame as you might need the result in the next frame However, if you do not get the result by next frame, the result will be discarded. Use Delegate if you would like to get the result right away when available.

Variables

		Name	Description
	int32	CurrentFrame	Used as counter for Buffer swap for DataBuffer. Right now it's only 2, but it can change.
	AsyncTraceData[...	DataBuffer	Async Trace Data Buffer Array. For now we only saves 2 frames.

Constructors

	Name	Description
	FWorldAsyncTraceState()

Functions

	Name	Description
AsyncTraceDa...	GetBufferForCurrentFrame()	Get the Buffer for Current Frame
AsyncTraceDa...	GetBufferForFrame ( int32 Frame )	Get the Buffer for input Frame
AsyncTraceDa...	GetBufferForPreviousFrame()	Get the Buffer for Previous Frame

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