Hello, I’m having a problem using the function SweepMultiByChannel. I am creating an Sphere using SweepMultiByChannel to detect nearby actors within an specific radius. When I place a pawn actor with basic mesh, collision and object type Pawn, The Sphere generated fills the TArray result with only one actor reference, which is the functionality that I’m trying to accomplish. But when I place an skeletal mesh inside the sphere, the SweepMultiByChannel Function, fills the return array with several references of the same skeletal mesh owner actor. The objective would be to return ONLY ONE reference of EACH actor inside the result array. I’m aware that going through the array and removing duplicated actor references would solve the issue, but this would be extremely inefficient. May be I’m not using the function the right way.
Here is the code that uses the SweepMultiByChannel function:
/*TArray is the collection that contains all the HitResults*/
TArray<FHitResult> HitResults;
/*The Start location of the sphere*/
FVector StartLocation = GetActorLocation();
FVector EndLocation = GetActorLocation();
ECollisionChannel ECC = ECollisionChannel::ECC_Pawn;
/*Declare the Collision Shape, assign a Sphere shape and set it's radius*/
FCollisionShape CollisionShape = FCollisionShape::MakeSphere(SphereRadius);
/*Perform the actual raycast. This method returns true if there is at least 1 hit.*/
bool bHitSomething = Owner->GetWorld()->SweepMultiByChannel(HitResults, StartLocation, EndLocation, FQuat::FQuat(), ECC, CollisionShape);
/*If the raycast hit a number of objects, iterate through them and print their name in the console*/
if (bHitSomething)
{
for (auto It = HitResults.CreateIterator(); It; It++)
{
GLog->Log((*It).Actor->GetName());
GEngine->AddOnScreenDebugMessage(-1, 5.0f, FColor::Green, (*It).Actor->GetName());
//GEngine->AddOnScreenDebugMessage(-1, 1.0f, FColor::Green, FString::Printf(TEXT("%d"), HitResults.Num()));
}
}
/*In order to draw the sphere of the first image, I will use the DrawDebugSphere function which resides in the DrawDebugHelpers.h
This function needs the center of the sphere which in this case is provided by the following equation*/
FVector CenterOfSphere = ((EndLocation - StartLocation) / 2) + StartLocation;
/*Draw the sphere in the viewport*/
DrawDebugSphere(GetWorld(), CenterOfSphere, CollisionShape.GetSphereRadius(), Segments, FColor::Red, true);
In the image is the sphere being generated from a cube, and printed are the actors returned in the array, I painted over the actors that doesn’t matter in this question (cube, floor, projectile, etc)
