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What is ETraceTypeQuery

Does anyone know what the ETraceTypeQuery is? Its a type that is passed into functions such as GetHitResultAtScreenPosition and GetHitResultUnderCursorByChannel, but I'm not sure what it is. I'm using the previously mentioned functions to make a character look at the mouse in a top-down shooter. The problem is when the mouse moves over an obstacle it interferes with the direction the character faces. I was hoping the ETraceTypeQuery could solve this issue, just not sure how to use it.

Here is the code that I have:

 void ALaserTagPlayerController::RotateToMouseCursor() 
     FHitResult Hit;
     //The two lines below have the same effect
     //GetHitResultUnderCursorByChannel(TraceTypeQuery1, false, Hit);
     GetHitResultAtScreenPosition(Cast<ULocalPlayer>(Player)->ViewportClient->GetMousePosition(), TraceTypeQuery1, true, Hit);
     const FVector PlayerPos = GetWorld()->GetFirstPlayerController()->GetCharacter()->GetActorLocation();
     FRotator PlayerRot = FRotationMatrix::MakeFromX(Hit.Location - PlayerPos).Rotator();
     PlayerRot.Pitch = 0.0f;


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asked Jul 19 '14 at 08:24 PM in C++ Programming

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avatar image 天天爱学习 May 04 '19 at 02:03 PM

Hello, in the 4.22.1 version, you can view the source code of the


function. In the first line,

ECollisionChannel CollisionChannel = UEngineTypes::ConvertToCollisionChannel(TraceChannel); ConvertToCollisionChannel()

This function converts the enumeration value. To the corresponding


, for example ETraceTypeQuery I use the second TraceTypeQuery2, then the corresponding ECollisionChannel is

ECC_WorldDynamic UMETA(DisplayName="WorldDynamic")

, which is the second one.

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