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Unreal Engine C++ API Reference > Runtime > Engine > Engine > UWorld
References
| Module | Engine |
| Header | /Engine/Source/Runtime/Engine/Classes/Engine/World.h |
| Include | #include "Engine/World.h" |
| Source | /Engine/Source/Runtime/Engine/Private/Collision/WorldCollisionAsync.cpp |
FTraceHandle AsyncLineTraceByChannel
&40;
EAsyncTraceType InTraceType,
const FVector & Start,
const FVector & End,
ECollisionChannel TraceChannel,
const FCollisionQueryParams & Params,
const FCollisionResponseParams & ResponseParam,
const FTraceDelegate &42; InDelegate,
uint32 UserData
&41;
Remarks
Interface for Async. Pretty much same parameter set except you can optional set delegate to be called when execution is completed and you can set UserData if you'd like if no delegate, you can query trace data using QueryTraceData or QueryOverlapData the data is available only in the next frame after request is made - in other words, if request is made in frame X, you can get the result in frame (X+1)
FTraceDelegate TraceDelegate; TraceDelegate.BindRaw(this, &MyActor::TraceDone);
Parameters
| Name | Description |
|---|---|
| InTraceType | Indicates if you want multiple results, single result, or just yes/no (no hit information) |
| Start | Start location of the ray |
| End | End location of the ray |
| TraceChannel | The 'channel' that this ray is in, used to determine which components to hit |
| Params | Additional parameters used for the trace |
| ResponseParam | ResponseContainer to be used for this trace |
| InDelegate | Delegate function to be called - to see example, search FTraceDelegate Example can be void MyActor::TraceDone(const FTraceHandle& TraceHandle, FTraceDatum & TraceData) Before sending to the function, |
| UserData | UserData |