Single Line Trace

void AFpCppCharacter::Tick(float DeltaTime)
{
    Super::Tick(DeltaTime);

    //Hit contains information about what the raycast hit.
    FHitResult Hit;

    //The length of the ray in units.
    //For more flexibility you can expose a public variable in the editor
    float RayLength = 200;

    //The Origin of the raycast
    FVector StartLocation = FirstPersonCameraComponent->GetComponentLocation();

    //The EndLocation of the raycast
    FVector EndLocation = StartLocation + (FirstPersonCameraComponent->GetForwardVector() * RayLength);

    //Collision parameters. The following syntax means that we don't want the trace to be complex
    FCollisionQueryParams CollisionParameters;

    //Perform the line trace
    //The ECollisionChannel parameter is used in order to determine what we are looking for when performing the raycast
    ActorLineTraceSingle(Hit, StartLocation, EndLocation, ECollisionChannel::ECC_WorldDynamic, CollisionParameters);

    //DrawDebugLine is used in order to see the raycast we performed
    //The boolean parameter used here means that we want the lines to be persistent so we can see the actual raycast
    //The last parameter is the width of the lines.
    DrawDebugLine(GetWorld(), StartLocation, EndLocation, FColor::Green, true, -1, 0, 1.f);
}