LineTraceSingle not picking up terrain?

Development World Creation
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1

I’m using this on my player/character that will be used as part of my lock on functions.

FHitResult testHitResult(ForceInit);
	UWorld* TheWorld = this->GetWorld();
	FVector testStartFVector = this->GetActorLocation();
	FVector testEndFVector = testStartFVector + GetActorForwardVector() * 1000.0f;
	FColor debugColor = FColor::Red;

	FCollisionQueryParams TraceParams(TEXT("MyTrace"), true, this);
	TraceParams.bTraceComplex = true;
	TraceParams.bTraceAsyncScene = true;
	TraceParams.bReturnPhysicalMaterial = false;

	if (TheWorld->LineTraceSingle(testHitResult, testStartFVector, testEndFVector, ECC_WorldStatic, TraceParams))
	{
		ALivingEntity* tempActor = (testHitResult.GetActor() != NULL ? Cast<ALivingEntity>(testHitResult.GetActor()) : NULL);

		if (tempActor != NULL)
		{
			//GEngine->AddOnScreenDebugMessage(-1, 5.0f, FColor::Blue, TEXT("Found"));
			debugColor = FColor::Red;
			Target = tempActor;
			//DrawDebugBox(TheWorld, testHitResult.Location, FVector(10, 10, 10), debugColor);
		}

	}

This all works but as it uses my characters direction to do the trace I hadn’t noticed that it ignores terrain as I can actually see the target my self.

I’ve put this code onto my bots, and my bots know the location of their target, so the trace always puts a line straight to them. From their eyes to their targets location.

for some reason they seem to ignore the terrain for collision, any Ideas?

My terrain is set to BlockAll.

2

Hi, I have the same issue here. My LineTraceSingle seems to ignore walls, building, etc, and find the target trough everything on the level.

Here I use the ECC_Pawn chanel with ECR_Block on Pawn, WorldStatic and WorldDynamic.

Do you have finally found the solution ?

Best regards.

3

No sorry mate, just really odd. I’ve tried loads of collision channels and different settings none of them work.

4

Some one on the forum (before the crash) suggest me to use the second overload of the function.

No more ECC_Channel but a FCollisionObjectQueryParams set to AllObjects.

FHitResult Hit(ForceInit);
FCollisionQueryParams TraceParams = FCollisionQueryParams(FName(TEXT("Trace")), true, this);
FCollisionObjectQueryParams TracesParams = FCollisionObjectQueryParams::AllObjects;
[...]
GetWorld()->LineTraceSingle(*Hit, Start, End, *TraceParams, *ExtraParams);

And it works better for me.