Swipe gesture recognition with leap motion

[fk22]

Hi I am interested to make a swipe left and right with leap motion and I was following a tutorial but it won't work in my code. How can I check if the hand swiped left and right?

> using System.Collections;
> using System.Collections.Generic;
> using UnityEngine;
> using Leap;


> public class GestureHands : MonoBehaviour
> {
>     Controller controller;

>     

>     void Start()
>     {
>         controller = new Controller();

>         controller.EnableGesture(Gesture.GestureType.TYPESWIPE); //doesn't recognise EnableGesture and Gesture
>        


>    }
> }

[AlexColgan]

What versions of the Leap Motion software, Unity, etc. are you using?

[fk22]

I am using Unity 2018.3.11f1 and Leap_Motion_Core_Assets_ 4.4.0 and Leap_Motion_Interaction_Engine_1.2.0
I downloaded the leap motion core assets and the interaction engine yesterday.

[AlexColgan]

Swipe gestures were deprecated in 2016 and removed from the core tracking codebase in 2018. You can find out more here: https://support.leapmotion.com/hc/en-us/articles/360004493377-What-happened-to-gesture-support-How-can-I-make-a-gesture-

[fk22]

I did download V2 from https://developer.leapmotion.com/setup/desktop but are there any version specifications for leap motion assets for Unity?

[AlexColgan]

You can find the older assets here: https://github.com/leapmotion/LeapMotionCoreAssets

Note that these assets were built out for Unity 5.2, so they won't work out of the box if you're using a more recent version.

[fk22]

Thanks for your advises. Now the code works. However, I wanted to ask you, if I can use the other version I was using before (since I have started the project with that one), can I make a gesture similar to swipe? What I am trying to do is make a gesture and then I will open a book. So the swipe gesture would be appropriate for this but is there any other gesture in Leap_Motion_Core_Assets_ 4.4.0 and Leap_Motion_Interaction_Engine_1.2.0 version to make this?

[fk22]

Hi again Alex, following my last comment, Is there any nice gesture similar to swipe that I can use from the latest version of leap motion? Since I started my project with last versions, would be great if I continue with those versions.

[AlexColgan]

Can you describe what the user would be swiping for (e.g. to move back and forth between options)?

[fk22]

@AlexColgan At the moment I am opening and closing a book with space key and then I go through the pages with arrows (right arrow to go to next page and left arrow to go to previous page). You can have a look at how it looks like here:

https://drive.google.com/file/d/1-igFL9NMH_6UOicRNWCxMcpS51I3u7wf/view

Now I want to make the same movements for the book with hand gestures. The swipe gesture seemed appropriate and I saw a tutorial where I could swipe left and right but it uses another (previous) version of leap motion. Whereas I have already started to work on the project with the latest version. Therefore, I am now thinking what kind gesture to use for the book.

[AlexColgan]

Thanks, this is very interesting! I would recommend using pinch: https://github.com/leapmotion/UnityModules/blob/develop/Assets/LeapMotion/Core/Scripts/DetectionUtilities/PinchDetector.cs

If the user pinches and moves their hand X centimeters to the right, the book goes to the previous page; pinching and moving the hand X centimeters to the left would take them to the next page. Pinching is great for a use case like this because it's natural to hold a piece of paper between the thumb and index finger, and there's much less probability of a false positive (e.g. with swipes, sometimes the user will accidentally make a swipe while getting their hand into position) because pinching is a binary action that's easy to start or stop.

[fk22]

That seems a good idea. I will give it a try. If I have any questions, I may comment here again Many thanks for the advises. Best wishes.

[fk22]

Hi again @AlexColgan I managed to do that using the condition if(IsActive) which checks for a pinch. Now I can open the book with pinch and I am trying to open the pages with _lastPosition.x coordinates and _lastRotation.x To open the pages on the left works but to open on the right does not work and I believe is because I am not putting the coordinates right:

Video:

https://drive.google.com/file/d/1WV713awdmIJKU5hJEGMo3hNd5jpjg4Vk/view?usp=sharing

Code below:

  }else if (HoverStaySpectacles.activeSelf && (_lastPosition.x > 0 && _lastRotation.x < 0) && !SpectaclesBook.IsFirstPageGroup)
                {
                 
                    Debug.Log("Turning the page to the right");
                    SpectaclesBook.TurnToPage(SpectaclesBook.CurrentLeftPageNumber - 2, EndlessBook.PageTurnTimeTypeEnum.TimePerPage, 1f);
                    
                    

                }else if (HoverStaySpectacles.activeSelf && (_lastPosition.x < 0 && _lastRotation.x > 0) && !SpectaclesBook.IsLastPageGroup)
                {
                   
                    Debug.Log("Turning the page to the left");
                    SpectaclesBook.TurnToPage(SpectaclesBook.CurrentLeftPageNumber + 2, EndlessBook.PageTurnTimeTypeEnum.TimePerPage, 1f);
                  
                }

[fk22]

Hi @AlexColgan is there any advice you can give me with regards to this? Many thanks