Leap Motion + Processing Library problems

[Abertran]

I’m trying to use the Leap Motion for school homework. I downloaded the library from Github and added it to the Processing Libraries.

I’m using:

• Processing 3.2.3
• Leap Motion Software 2.3.1+31549

At first, it seems to work fine, but after a while, it stops recognizing the hands. And the only way I found to make it work again is by restarting my computer (I’m using Windows 10). Still, if I use it for a while again, it stops recognizing.

Does anyone know how to fix it?

Here I’m using one of the examples given when downloading the library and I copy the code in case it helps.

Working:

Stopped working:

Example code:

import de.voidplus.leapmotion.*;

// ======================================================
// Table of Contents:
// ├─ 1. Callbacks
// ├─ 2. Hand
// ├─ 3. Arms
// ├─ 4. Fingers
// ├─ 5. Bones
// ├─ 6. Tools
// └─ 7. Devices
// ======================================================


LeapMotion leap;

void setup() {
  size(800, 500);
  background(255);
  // ...

  leap = new LeapMotion(this);
}


// ======================================================
// 1. Callbacks

void leapOnInit() {
  // println("Leap Motion Init");
}
void leapOnConnect() {
  // println("Leap Motion Connect");
}
void leapOnFrame() {
  // println("Leap Motion Frame");
}
void leapOnDisconnect() {
  // println("Leap Motion Disconnect");
}
void leapOnExit() {
  // println("Leap Motion Exit");
}


void draw() {
  background(255);
  // ...

  int fps = leap.getFrameRate();
  for (Hand hand : leap.getHands ()) {


    // ==================================================
    // 2. Hand

    int     handId             = hand.getId();
    PVector handPosition       = hand.getPosition();
    PVector handStabilized     = hand.getStabilizedPosition();
    PVector handDirection      = hand.getDirection();
    PVector handDynamics       = hand.getDynamics();
    float   handRoll           = hand.getRoll();
    float   handPitch          = hand.getPitch();
    float   handYaw            = hand.getYaw();
    boolean handIsLeft         = hand.isLeft();
    boolean handIsRight        = hand.isRight();
    float   handGrab           = hand.getGrabStrength();
    float   handPinch          = hand.getPinchStrength();
    float   handTime           = hand.getTimeVisible();
    PVector spherePosition     = hand.getSpherePosition();
    float   sphereRadius       = hand.getSphereRadius();

    // --------------------------------------------------
    // Drawing
    hand.draw();


    // ==================================================
    // 3. Arm

    if (hand.hasArm()) {
      Arm     arm              = hand.getArm();
      float   armWidth         = arm.getWidth();
      PVector armWristPos      = arm.getWristPosition();
      PVector armElbowPos      = arm.getElbowPosition();
    }


    // ==================================================
    // 4. Finger

    Finger  fingerThumb        = hand.getThumb();
    // or                        hand.getFinger("thumb");
    // or                        hand.getFinger(0);

    Finger  fingerIndex        = hand.getIndexFinger();
    // or                        hand.getFinger("index");
    // or                        hand.getFinger(1);

    Finger  fingerMiddle       = hand.getMiddleFinger();
    // or                        hand.getFinger("middle");
    // or                        hand.getFinger(2);

    Finger  fingerRing         = hand.getRingFinger();
    // or                        hand.getFinger("ring");
    // or                        hand.getFinger(3);

    Finger  fingerPink         = hand.getPinkyFinger();
    // or                        hand.getFinger("pinky");
    // or                        hand.getFinger(4);


    for (Finger finger : hand.getFingers()) {
      // or              hand.getOutstretchedFingers();
      // or              hand.getOutstretchedFingersByAngle();

      int     fingerId         = finger.getId();
      PVector fingerPosition   = finger.getPosition();
      PVector fingerStabilized = finger.getStabilizedPosition();
      PVector fingerVelocity   = finger.getVelocity();
      PVector fingerDirection  = finger.getDirection();
      float   fingerTime       = finger.getTimeVisible();

      // ------------------------------------------------
      // Drawing

      // Drawing:
      // finger.draw();  // Executes drawBones() and drawJoints()
      // finger.drawBones();
      // finger.drawJoints();

      // ------------------------------------------------
      // Selection

      switch(finger.getType()) {
      case 0:
        // System.out.println("thumb");
        break;
      case 1:
        // System.out.println("index");
        break;
      case 2:
        // System.out.println("middle");
        break;
      case 3:
        // System.out.println("ring");
        break;
      case 4:
        // System.out.println("pinky");
        break;
      }


      // ================================================
      // 5. Bones
      // --------
      // https://developer.leapmotion.com/documentation/java/devguide/Leap_Overview.html#Layer_1

      Bone    boneDistal       = finger.getDistalBone();
      // or                      finger.get("distal");
      // or                      finger.getBone(0);

      Bone    boneIntermediate = finger.getIntermediateBone();
      // or                      finger.get("intermediate");
      // or                      finger.getBone(1);

      Bone    boneProximal     = finger.getProximalBone();
      // or                      finger.get("proximal");
      // or                      finger.getBone(2);

      Bone    boneMetacarpal   = finger.getMetacarpalBone();
      // or                      finger.get("metacarpal");
      // or                      finger.getBone(3);

      // ------------------------------------------------
      // Touch emulation

      int     touchZone        = finger.getTouchZone();
      float   touchDistance    = finger.getTouchDistance();

      switch(touchZone) {
      case -1: // None
        break;
      case 0: // Hovering
        // println("Hovering (#" + fingerId + "): " + touchDistance);
        break;
      case 1: // Touching
        // println("Touching (#" + fingerId + ")");
        break;
      }
    }


    // ==================================================
    // 6. Tools

    for (Tool tool : hand.getTools()) {
      int     toolId           = tool.getId();
      PVector toolPosition     = tool.getPosition();
      PVector toolStabilized   = tool.getStabilizedPosition();
      PVector toolVelocity     = tool.getVelocity();
      PVector toolDirection    = tool.getDirection();
      float   toolTime         = tool.getTimeVisible();

      // ------------------------------------------------
      // Drawing:
      // tool.draw();

      // ------------------------------------------------
      // Touch emulation

      int     touchZone        = tool.getTouchZone();
      float   touchDistance    = tool.getTouchDistance();

      switch(touchZone) {
      case -1: // None
        break;
      case 0: // Hovering
        // println("Hovering (#" + toolId + "): " + touchDistance);
        break;
      case 1: // Touching
        // println("Touching (#" + toolId + ")");
        break;
      }
    }
  }


  // ====================================================
  // 7. Devices

  for (Device device : leap.getDevices()) {
    float deviceHorizontalViewAngle = device.getHorizontalViewAngle();
    float deviceVericalViewAngle = device.getVerticalViewAngle();
    float deviceRange = device.getRange();
  }
}