ue4-点击屏幕，获取3d世界里的物体

分类于

获取3d世界坐标，物体

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//触屏回调
void AMyPlayerCtrler::OnTapPressed(const FVector2D& ScreenPosition, float DownTime)
{
    FVector WorldPosition(0.f); //存储点击中3d实体的世界坐标
    AActor* const HitActor = GetClickTarget(ScreenPosition, WorldPosition);

    AMyChar* tarChar = Cast<AMyChar>(HitActor);
    if (tarChar != nullptr)
    {
        UE_LOG(GameLogger, Warning, TEXT("--- AMyPlayerCtrler::OnTapPressed, target id:%d"), tarChar->GetUuid());
        //TODO: 做你想干的事
    }
}

//根据屏幕2d点ScreenPoint，和检查标记Collision_Pawn，检测是否点击中world中的某个符合条件的actor
AActor* AMyPlayerCtrler::GetClickTarget(const FVector2D& ScreenPoint, FVector& WorldPoint) const
{
    FHitResult Hit;
    if (GetHitResultAtScreenPosition(ScreenPoint, Collision_Pawn, true, Hit)) 
    {
        WorldPoint = Hit.ImpactPoint;
        return Hit.GetActor();
    }
    return nullptr;
}

GetHitResultAtScreenPosition 是 APlayerController 中的接口