Help line trace not working

[Nati-onBear]

I’ve tried logging out everything already, from crosshair to look direction, start and end location. All of those work just fine. Then l tried log out Hit Location as in the picture but nothing came out. I think it’s because LineTrace always returns false. How can I fix this?

[DanM]

You can add a debug trace to see what’s going on

static FName TraceTag = TEXT("TraceTag");
FCollisionQueryParams Params(TraceTag);
GetWorld()->DebugDrawTraceTag = TraceTag;

if(GetWorld()->LineTraceSingleByChannel(
    HitResult,
    StartLocation,
    EndLocation,
    FCollisionChannel::ECC_Visibility,
    Params)) // <- extra argument
//...

[Nati-onBear]

My, I see what happened, I tried what you told, it didn’t draw anything, which meant no trace were even there. Then I printed Hit Result, the start trace and end trace were the same. I let the End Vector be StartLocation. Silly me. Thank you for your help.

[DanM]

No problem