How to detect only one swipe gesture?

[razvanboboc]

Hello! I am using Leap Motion core asset 2.3.1 and I want to change the displayed object using swipe gesture. Si, let's say a cube is rendered on the screen. When I make the swipe gesture, I want that the cube to be replaced by a sphere. The question is how can I detect only a single swipe gesture, because it detects a lot of 'swipes' when I swipe once. Any suggestions? Thank you in advance!

[Barrett-Fox]

The notion of a swipe works best in a physical tablet based interaction. There, we have a clear binary of touching the glass that happens before we even begin detecting motion for a swipe.

With hands in VR, our hands are usually in motion already. So knowing how, when and where to begin detecting the swipe are questions we need to define for a successful interaction. This could be done by asking the user to swipe through a visible detection volume or other type of visual affordance.

For the simple interaction you're describing, a reliable way to do this switching would be with a 3D button like we provide in our Interaction Engine examples in \Assets\LeapMotion\Modules\InteractionEngine\Examples\2. Basic UI

[Bren]

Here is how I handled detecting a swipe in Form & Function 3D. Hopefully, it works with your version of the core assets:

HI @haukesa , happy to share. Here's the meat of the script I used to detect swipes. It's very similar to the examples in the docs but I only grab the first gesture registered in the gesturelist and I added a cool down of 0.75 sec. void Update () { GestureList gestureList = mleapController.Frame().Gestures(); if(gestureList.Count > 0){ Gesture gesture = _gestureList [0]; switch (gesture.Type) { case Gesture.GestureType.TYPESWIPE: SwipeGesture swipe = new SwipeGesture (g…

I agree with @Barrett-Fox , that in-air swipe interactions can sometimes feel a bit detached or out of context. But it really depends on the experience you're building. We in-air swipe all the time in real life. We wave to greet people, gesture to give cars the right of way. So don't feel like there's a hard rule for if/when to use these types of gestures. Iterate and test, that's the only way you'll know. Good luck!

[razvanboboc]

Thanks a lot for your reply! It was very helpful!

[razvanboboc]

Hello everyone!

I still have not been able to implement the desired behavior: when I swipe once, a sphere have to be rendered on the screen. To the next swipe, the sphere should be replaced with another object (a cube, let's say) and so on until the end of the 'object list'. After a number of seven objects, the whole process should be resumed. I have a piece of code with three objects, but I'm not yet able to detect only one swipe and to change the displayed object accordingly. I am grateful for any idea or help.

public class Swipe : MonoBehaviour {
Controller controller;

public GameObject wall = null;
public GameObject sphere = null;
public GameObject capsule = null;

public Vector3 startPos;
public Vector3 endPos;
List<GameObject> list;
public float distance = 5f;
int count = 0;

//Time to take from start to end
private float lerpTime = 0.02f;
//This will update the lerp time
private float currentLerpTime = 0;
private float _lastGestureTime = 0;

private bool keyHit = false;

// Use this for initialization
void Start () {
    controller = new Controller();
    controller.EnableGesture(Gesture.GestureType.TYPESWIPE);
    controller.Config.SetFloat("Gesture.Swipe.MinLength", 200.0f);
    controller.Config.SetFloat("Gesture.Swipe.MinVelocity", 750f);
    controller.Config.Save();
    startPos = wall.transform.position;
    endPos = wall.transform.position + Vector3.up * distance;
    list = new List<GameObject>();
}

// Update is called once per frame
void Update()
{
    Frame frame = controller.Frame();
    GestureList gestures = frame.Gestures();
    Hand hand = frame.Hands.Frontmost;
    GameObject c = GameObject.Find("Cube");
    list.Add(c);
    GameObject ca = GameObject.Find("Capsule");
    list.Add(ca);
    GameObject s = GameObject.Find("Sphere");
    list.Add(s);
    foreach (GameObject li in list)
    {
        Debug.Log(li.name);
    }

    if (hand.IsRight)
    {
        for (int i = 0; i < gestures.Count; i++)
        {
            Gesture gesture = gestures[i];
            if (gesture.Type == Gesture.GestureType.TYPESWIPE)
            {
                SwipeGesture Swipe = new SwipeGesture(gesture);
                Vector swipeDirection = Swipe.Direction;
                if (Time.time - _lastGestureTime > 0.75f && swipeDirection.x < 0)
                {
                    Debug.Log("Left");
                    currentLerpTime += Time.deltaTime;
                    if (currentLerpTime >= lerpTime)
                    {
                        currentLerpTime = lerpTime;
                    }
                    float Perc = currentLerpTime / lerpTime;
                    list[0].SetActive(false);
                    list[1].SetActive(false);
                    list[2].SetActive(true);
                    _lastGestureTime = Time.time;
                }
                if (Time.time - _lastGestureTime > 0.75f && swipeDirection.x > 0)
                {
                    Debug.Log("Right");
                    currentLerpTime += Time.deltaTime;
                    if (currentLerpTime >= lerpTime)
                    {
                        currentLerpTime = lerpTime;
                    }
                    float Perc = currentLerpTime / lerpTime;
                    list[0].SetActive(true);
                    list[1].SetActive(false);
                    list[2].SetActive(false);
                    _lastGestureTime = Time.time;
                }
                count++;
            }
        }
    }
}

}