Merge pull request #4348 from Atlante45/relax_face_tracker

Relax face tracker

interface/src/Application.cpp

@@ -1859,35 +1859,6 @@ void Application::updateMouseRay() {
     }
 }
 
-void Application::updateFaceshift() {
-    bool showWarnings = Menu::getInstance()->isOptionChecked(MenuOption::PipelineWarnings);
-    PerformanceWarning warn(showWarnings, "Application::updateFaceshift()");
-    auto faceshift = DependencyManager::get<Faceshift>();
-    //  Update faceshift
-    faceshift->update();
-
-    //  Copy angular velocity if measured by faceshift, to the head
-    if (faceshift->isActive()) {
-        _myAvatar->getHead()->setAngularVelocity(faceshift->getHeadAngularVelocity());
-    }
-}
-
-void Application::updateVisage() {
-    bool showWarnings = Menu::getInstance()->isOptionChecked(MenuOption::PipelineWarnings);
-    PerformanceWarning warn(showWarnings, "Application::updateVisage()");
-
-    //  Update Visage
-    DependencyManager::get<Visage>()->update();
-}
-
-void Application::updateDDE() {
-    bool showWarnings = Menu::getInstance()->isOptionChecked(MenuOption::PipelineWarnings);
-    PerformanceWarning warn(showWarnings, "Application::updateDDE()");
-    
-    //  Update Cara
-    DependencyManager::get<DdeFaceTracker>()->update();
-}
-
 void Application::updateMyAvatarLookAtPosition() {
     PerformanceTimer perfTimer("lookAt");
     bool showWarnings = Menu::getInstance()->isOptionChecked(MenuOption::PipelineWarnings);
@@ -2067,12 +2038,13 @@ void Application::update(float deltaTime) {
     {
         PerformanceTimer perfTimer("devices");
         DeviceTracker::updateAll();
-        updateFaceshift();
+        FaceTracker* tracker = getActiveFaceTracker();
-        updateVisage();
+        if (tracker) {
+            tracker->update(deltaTime);
+        }
         SixenseManager::getInstance().update(deltaTime);
         JoystickScriptingInterface::getInstance().update();
         _prioVR.update(deltaTime);
-
     }
     
     // Dispatch input events

interface/src/Application.h

@@ -421,9 +421,6 @@ private:
     // Various helper functions called during update()
     void updateLOD();
     void updateMouseRay();
-    void updateFaceshift();
-    void updateVisage();
-    void updateDDE();
     void updateMyAvatarLookAtPosition();
     void updateThreads(float deltaTime);
     void updateMetavoxels(float deltaTime);

interface/src/avatar/Head.cpp

@@ -42,7 +42,6 @@ Head::Head(Avatar* owningAvatar) :
     _mouth2(0.0f),
     _mouth3(0.0f),
     _mouth4(0.0f),
-    _angularVelocity(0,0,0),
     _renderLookatVectors(false),
     _saccade(0.0f, 0.0f, 0.0f),
     _saccadeTarget(0.0f, 0.0f, 0.0f),

interface/src/avatar/Head.h

@@ -55,9 +55,6 @@ public:
 
     /// \return orientationBody * orientationBasePitch
     glm::quat getCameraOrientation () const;
-
-    const glm::vec3& getAngularVelocity() const { return _angularVelocity; }
-    void setAngularVelocity(glm::vec3 angularVelocity) { _angularVelocity = angularVelocity; }
     
     void setCorrectedLookAtPosition(glm::vec3 correctedLookAtPosition);
     glm::vec3 getCorrectedLookAtPosition();
@@ -130,7 +127,6 @@ private:
     float _mouth2;
     float _mouth3;
     float _mouth4;
-    glm::vec3 _angularVelocity;
     bool _renderLookatVectors;
     glm::vec3 _saccade;
     glm::vec3 _saccadeTarget;

interface/src/avatar/MyAvatar.cpp

@@ -892,13 +892,7 @@ void MyAvatar::updateLookAtTargetAvatar() {
     _lookAtTargetAvatar.clear();
     _targetAvatarPosition = glm::vec3(0.0f);
     
-    glm::quat faceRotation = Application::getInstance()->getViewFrustum()->getOrientation();
+    glm::vec3 lookForward = getHead()->getFinalOrientationInWorldFrame() * IDENTITY_FRONT;
-    FaceTracker* tracker = Application::getInstance()->getActiveFaceTracker();
-    if (tracker) {
-        // If faceshift or other face tracker in use, add on the actual angle of the head
-        faceRotation *= tracker->getHeadRotation();
-    }
-    glm::vec3 lookForward = faceRotation * IDENTITY_FRONT;
     glm::vec3 cameraPosition = Application::getInstance()->getCamera()->getPosition();
     
     float smallestAngleTo = glm::radians(Application::getInstance()->getCamera()->getFieldOfView()) / 2.0f;
@@ -1164,15 +1158,8 @@ void MyAvatar::updateOrientation(float deltaTime) {
         pitch *= DEGREES_PER_RADIAN;
         roll *= DEGREES_PER_RADIAN;
         
-        // Record the angular velocity
-        Head* head = getHead();
-        if (deltaTime > 0.0f) {
-            glm::vec3 angularVelocity(pitch - head->getBasePitch(), yaw - head->getBaseYaw(), roll - head->getBaseRoll());
-            angularVelocity *= 1.0f / deltaTime;
-            head->setAngularVelocity(angularVelocity);
-        }
-        
         //Invert yaw and roll when in mirror mode
+        Head* head = getHead();
         if (Application::getInstance()->getCamera()->getMode() == CAMERA_MODE_MIRROR) {
             head->setBaseYaw(-yaw);
             head->setBasePitch(pitch);

interface/src/devices/DdeFaceTracker.cpp

@@ -50,6 +50,8 @@ DdeFaceTracker::DdeFaceTracker() :
 }
 
 DdeFaceTracker::DdeFaceTracker(const QHostAddress& host, quint16 port) :
+    _host(host),
+    _port(port),
     _lastReceiveTimestamp(0),
     _reset(false),
     _leftBlinkIndex(0), // see http://support.faceshift.com/support/articles/35129-export-of-blendshapes
@@ -63,9 +65,7 @@ DdeFaceTracker::DdeFaceTracker(const QHostAddress& host, quint16 port) :
     _browUpRightIndex(18),
     _mouthSmileLeftIndex(28),
     _mouthSmileRightIndex(29),
-    _jawOpenIndex(21),
+    _jawOpenIndex(21)
-    _host(host),
-    _port(port)
 {
     _blendshapeCoefficients.resize(NUM_EXPRESSION);
     
@@ -80,18 +80,6 @@ DdeFaceTracker::~DdeFaceTracker() {
     }
 }
 
-void DdeFaceTracker::init() {
-    
-}
-
-void DdeFaceTracker::reset() {
-    _reset  = true;
-}
-
-void DdeFaceTracker::update() {
-    
-}
-
 void DdeFaceTracker::setEnabled(bool enabled) {
     // isOpen() does not work as one might expect on QUdpSocket; don't test isOpen() before closing socket.
     _udpSocket.close();

interface/src/devices/DdeFaceTracker.h

@@ -23,12 +23,10 @@ class DdeFaceTracker : public FaceTracker, public Dependency {
     SINGLETON_DEPENDENCY
     
 public:
-    //initialization
+    virtual void reset() { _reset = true; }
-    void init();
+
-    void reset();
+    virtual bool isActive() const;
-    void update();
+    virtual bool isTracking() const { return isActive(); }
-    
-    bool isActive() const;
     
     float getLeftBlink() const { return getBlendshapeCoefficient(_leftBlinkIndex); }
     float getRightBlink() const { return getBlendshapeCoefficient(_rightBlinkIndex); }

interface/src/devices/FaceTracker.cpp

@@ -11,7 +11,41 @@
 
 #include "FaceTracker.h"
 
-FaceTracker::FaceTracker() :
+inline float FaceTracker::getBlendshapeCoefficient(int index) const {
-    _estimatedEyePitch(0.0f),
+    return isValidBlendshapeIndex(index) ? _blendshapeCoefficients[index] : 0.0f;
-    _estimatedEyeYaw(0.0f) {
 }
+
+float FaceTracker::getFadeCoefficient() const {
+    return _fadeCoefficient;
+}
+
+const glm::vec3 FaceTracker::getHeadTranslation() const {
+    return glm::mix(glm::vec3(0.0f), _headTranslation, getFadeCoefficient());
+}
+
+const glm::quat FaceTracker::getHeadRotation() const {
+    return glm::mix(glm::quat(), _headRotation, getFadeCoefficient());
+}
+
+void FaceTracker::update(float deltaTime) {
+    // Based on exponential distributions: http://en.wikipedia.org/wiki/Exponential_distribution
+    static const float EPSILON = 0.02f; // MUST BE < 1.0f
+    static const float INVERSE_AT_EPSILON = -std::log(EPSILON); // So that f(1.0f) = EPSILON ~ 0.0f
+    static const float RELAXATION_TIME = 0.8f; // sec
+    
+    if (isTracking()) {
+        if (_relaxationStatus == 1.0f) {
+            _fadeCoefficient = 1.0f;
+            return;
+        }
+        _relaxationStatus = glm::clamp(_relaxationStatus + deltaTime / RELAXATION_TIME, 0.0f, 1.0f);
+        _fadeCoefficient = 1.0f - std::exp(-_relaxationStatus * INVERSE_AT_EPSILON);
+    } else {
+        if (_relaxationStatus == 0.0f) {
+            _fadeCoefficient = 0.0f;
+            return;
+        }
+        _relaxationStatus = glm::clamp(_relaxationStatus - deltaTime / RELAXATION_TIME, 0.0f, 1.0f);
+        _fadeCoefficient = std::exp(-(1.0f - _relaxationStatus) * INVERSE_AT_EPSILON);
+    }
+}

interface/src/devices/FaceTracker.h

@@ -18,29 +18,40 @@
 #include <glm/glm.hpp>
 #include <glm/gtc/quaternion.hpp>
 
-/// Base class for face trackers (Faceshift, Visage).
+/// Base class for face trackers (Faceshift, Visage, DDE).
 class FaceTracker : public QObject {
     Q_OBJECT
     
 public:
-    FaceTracker();
+    virtual bool isActive() const { return false; }
-    virtual ~FaceTracker() {}
+    virtual bool isTracking() const { return false; }
     
-    const glm::vec3& getHeadTranslation() const { return _headTranslation; }
+    virtual void init() {}
-    const glm::quat& getHeadRotation() const { return _headRotation; }
+    virtual void update(float deltaTime);
+    virtual void reset() {}
+    
+    float getFadeCoefficient() const;
+    
+    const glm::vec3 getHeadTranslation() const;
+    const glm::quat getHeadRotation() const;
     
     float getEstimatedEyePitch() const { return _estimatedEyePitch; }
     float getEstimatedEyeYaw() const { return _estimatedEyeYaw; } 
     
+    int getNumBlendshapes() const { return _blendshapeCoefficients.size(); }
+    bool isValidBlendshapeIndex(int index) const { return index >= 0 && index < getNumBlendshapes(); }
     const QVector<float>& getBlendshapeCoefficients() const { return _blendshapeCoefficients; }
+    float getBlendshapeCoefficient(int index) const;
     
 protected:
-    
+    glm::vec3 _headTranslation = glm::vec3(0.0f);
-    glm::vec3 _headTranslation;
+    glm::quat _headRotation = glm::quat();
-    glm::quat _headRotation;
+    float _estimatedEyePitch = 0.0f;
-    float _estimatedEyePitch;
+    float _estimatedEyeYaw = 0.0f;
-    float _estimatedEyeYaw;
     QVector<float> _blendshapeCoefficients;
+    
+    float _relaxationStatus = 0.0f; // Between 0.0f and 1.0f
+    float _fadeCoefficient = 0.0f; // Between 0.0f and 1.0f
 };
 
 #endif // hifi_FaceTracker_h

interface/src/devices/Faceshift.cpp

@@ -25,37 +25,11 @@ using namespace fs;
 
 using namespace std;
 
+const QString DEFAULT_FACESHIFT_HOSTNAME = "localhost";
 const quint16 FACESHIFT_PORT = 33433;
-float STARTING_FACESHIFT_FRAME_TIME = 0.033f;
+const float DEFAULT_FACESHIFT_EYE_DEFLECTION = 0.25f;
 
 Faceshift::Faceshift() :
-    _tcpEnabled(true),
-    _tcpRetryCount(0),
-    _lastTrackingStateReceived(0),
-    _averageFrameTime(STARTING_FACESHIFT_FRAME_TIME),
-    _headAngularVelocity(0),
-    _headLinearVelocity(0),
-    _lastHeadTranslation(0),
-    _filteredHeadTranslation(0),
-    _eyeGazeLeftPitch(0.0f),
-    _eyeGazeLeftYaw(0.0f),
-    _eyeGazeRightPitch(0.0f),
-    _eyeGazeRightYaw(0.0f),
-    _leftBlinkIndex(0), // see http://support.faceshift.com/support/articles/35129-export-of-blendshapes
-    _rightBlinkIndex(1),
-    _leftEyeOpenIndex(8),
-    _rightEyeOpenIndex(9),
-    _browDownLeftIndex(14),
-    _browDownRightIndex(15),
-    _browUpCenterIndex(16),
-    _browUpLeftIndex(17),
-    _browUpRightIndex(18),
-    _mouthSmileLeftIndex(28),
-    _mouthSmileRightIndex(29),
-    _jawOpenIndex(21),
-    _longTermAverageEyePitch(0.0f),
-    _longTermAverageEyeYaw(0.0f),
-    _longTermAverageInitialized(false),
     _eyeDeflection("faceshiftEyeDeflection", DEFAULT_FACESHIFT_EYE_DEFLECTION),
     _hostname("faceshiftHostname", DEFAULT_FACESHIFT_HOSTNAME)
 {
@@ -71,31 +45,17 @@ Faceshift::Faceshift() :
 #endif
 }
 
+#ifdef HAVE_FACESHIFT
 void Faceshift::init() {
-#ifdef HAVE_FACESHIFT
     setTCPEnabled(Menu::getInstance()->isOptionChecked(MenuOption::Faceshift));
-#endif
 }
 
-bool Faceshift::isConnectedOrConnecting() const {
+void Faceshift::update(float deltaTime) {
-    return _tcpSocket.state() == QAbstractSocket::ConnectedState ||
-    (_tcpRetryCount == 0 && _tcpSocket.state() != QAbstractSocket::UnconnectedState);
-}
-
-bool Faceshift::isActive() const {
-#ifdef HAVE_FACESHIFT
-    const quint64 ACTIVE_TIMEOUT_USECS = 1000000;
-    return (usecTimestampNow() - _lastTrackingStateReceived) < ACTIVE_TIMEOUT_USECS;
-#else
-    return false;
-#endif
-}
-
-void Faceshift::update() {
     if (!isActive()) {
         return;
     }
-    PerformanceTimer perfTimer("faceshift");
+    FaceTracker::update(deltaTime);
+    
     // get the euler angles relative to the window
     glm::vec3 eulers = glm::degrees(safeEulerAngles(_headRotation * glm::quat(glm::radians(glm::vec3(
         (_eyeGazeLeftPitch + _eyeGazeRightPitch) / 2.0f, (_eyeGazeLeftYaw + _eyeGazeRightYaw) / 2.0f, 0.0f)))));
@@ -116,14 +76,28 @@ void Faceshift::update() {
 }
 
 void Faceshift::reset() {
-#ifdef HAVE_FACESHIFT
     if (_tcpSocket.state() == QAbstractSocket::ConnectedState) {
         string message;
         fsBinaryStream::encode_message(message, fsMsgCalibrateNeutral());
         send(message);
     }
     _longTermAverageInitialized = false;
+}
+
+bool Faceshift::isActive() const {
+    const quint64 ACTIVE_TIMEOUT_USECS = 1000000;
+    return (usecTimestampNow() - _lastTrackingStateReceived) < ACTIVE_TIMEOUT_USECS;
+}
+
+bool Faceshift::isTracking() const {
+    return isActive() && _tracking;
+}
 #endif
+
+
+bool Faceshift::isConnectedOrConnecting() const {
+    return _tcpSocket.state() == QAbstractSocket::ConnectedState ||
+    (_tcpRetryCount == 0 && _tcpSocket.state() != QAbstractSocket::UnconnectedState);
 }
 
 void Faceshift::updateFakeCoefficients(float leftBlink, float rightBlink, float browUp,
@@ -148,12 +122,13 @@ void Faceshift::updateFakeCoefficients(float leftBlink, float rightBlink, float
 }
 
 void Faceshift::setTCPEnabled(bool enabled) {
+#ifdef HAVE_FACESHIFT
     if ((_tcpEnabled = enabled)) {
         connectSocket();
-
     } else {
         _tcpSocket.disconnectFromHost();
     }
+#endif
 }
 
 void Faceshift::connectSocket() {
@@ -202,10 +177,6 @@ void Faceshift::readFromSocket() {
     receive(_tcpSocket.readAll());
 }
 
-float Faceshift::getBlendshapeCoefficient(int index) const {
-    return (index >= 0 && index < (int)_blendshapeCoefficients.size()) ? _blendshapeCoefficients[index] : 0.0f;
-}
-
 void Faceshift::send(const std::string& message) {
     _tcpSocket.write(message.data(), message.size());
 }

interface/src/devices/Faceshift.h

@@ -24,8 +24,7 @@
 
 #include "FaceTracker.h"
 
-const float DEFAULT_FACESHIFT_EYE_DEFLECTION = 0.25f;
+const float STARTING_FACESHIFT_FRAME_TIME = 0.033f;
-const QString DEFAULT_FACESHIFT_HOSTNAME = "localhost";
 
 /// Handles interaction with the Faceshift software, which provides head position/orientation and facial features.
 class Faceshift : public FaceTracker, public Dependency {
@@ -33,11 +32,17 @@ class Faceshift : public FaceTracker, public Dependency {
     SINGLETON_DEPENDENCY
 
 public:
-    void init();
+#ifdef HAVE_FACESHIFT
+    // If we don't have faceshift, use the base class' methods
+    virtual void init();
+    virtual void update(float deltaTime);
+    virtual void reset();
 
-    bool isConnectedOrConnecting() const; 
+    virtual bool isActive() const;
+    virtual bool isTracking() const;
+#endif
 
-    bool isActive() const;
+    bool isConnectedOrConnecting() const;
 
     const glm::vec3& getHeadAngularVelocity() const { return _headAngularVelocity; }
 
@@ -68,9 +73,6 @@ public:
     
     QString getHostname() { return _hostname.get(); }
     void setHostname(const QString& hostname);
-
-    void update();
-    void reset();
     
     void updateFakeCoefficients(float leftBlink,
                                 float rightBlink,
@@ -82,15 +84,12 @@ public:
                                 QVector<float>& coefficients) const;
     
 signals:
-
     void connectionStateChanged();
 
 public slots:
-    
     void setTCPEnabled(bool enabled);
     
 private slots:
-
     void connectSocket();
     void noteConnected();
     void noteError(QAbstractSocket::SocketError error);
@@ -101,8 +100,6 @@ private:
     Faceshift();
     virtual ~Faceshift() {}
     
-    float getBlendshapeCoefficient(int index) const;
-    
     void send(const std::string& message);
     void receive(const QByteArray& buffer);
     
@@ -113,48 +110,48 @@ private:
     fs::fsBinaryStream _stream;
 #endif
     
-    bool _tcpEnabled;
+    bool _tcpEnabled = true;
-    int _tcpRetryCount;
+    int _tcpRetryCount = 0;
-    bool _tracking;
+    bool _tracking = false;
-    quint64 _lastTrackingStateReceived;
+    quint64 _lastTrackingStateReceived = 0;
-    float _averageFrameTime;
+    float _averageFrameTime = STARTING_FACESHIFT_FRAME_TIME;
     
-    glm::vec3 _headAngularVelocity;
+    glm::vec3 _headAngularVelocity = glm::vec3(0.0f);
-    glm::vec3 _headLinearVelocity;
+    glm::vec3 _headLinearVelocity = glm::vec3(0.0f);
-    glm::vec3 _lastHeadTranslation;
+    glm::vec3 _lastHeadTranslation = glm::vec3(0.0f);
-    glm::vec3 _filteredHeadTranslation;
+    glm::vec3 _filteredHeadTranslation = glm::vec3(0.0f);
     
     // degrees
-    float _eyeGazeLeftPitch;
+    float _eyeGazeLeftPitch = 0.0f;
-    float _eyeGazeLeftYaw;
+    float _eyeGazeLeftYaw = 0.0f;
-    float _eyeGazeRightPitch;
+    float _eyeGazeRightPitch = 0.0f;
-    float _eyeGazeRightYaw;
+    float _eyeGazeRightYaw = 0.0f;
-    
-    int _leftBlinkIndex;
-    int _rightBlinkIndex;
-    int _leftEyeOpenIndex;
-    int _rightEyeOpenIndex;
-
-    // Brows
-    int _browDownLeftIndex;
-    int _browDownRightIndex;
-    int _browUpCenterIndex;
-    int _browUpLeftIndex;
-    int _browUpRightIndex;
-    
-    int _mouthSmileLeftIndex;
-    int _mouthSmileRightIndex;
-    
-    int _jawOpenIndex;
     
     // degrees
-    float _longTermAverageEyePitch;
+    float _longTermAverageEyePitch = 0.0f;
-    float _longTermAverageEyeYaw;
+    float _longTermAverageEyeYaw = 0.0f;
-    bool _longTermAverageInitialized;
+    bool _longTermAverageInitialized = false;
     
     Setting::Handle<float> _eyeDeflection;
     Setting::Handle<QString> _hostname;
     
+    // see http://support.faceshift.com/support/articles/35129-export-of-blendshapes
+    int _leftBlinkIndex = 0;
+    int _rightBlinkIndex = 1;
+    int _leftEyeOpenIndex = 8;
+    int _rightEyeOpenIndex = 9;
+    
+    // Brows
+    int _browDownLeftIndex = 14;
+    int _browDownRightIndex = 15;
+    int _browUpCenterIndex = 16;
+    int _browUpLeftIndex = 17;
+    int _browUpRightIndex = 18;
+    
+    int _mouthSmileLeftIndex = 28;
+    int _mouthSmileRightIndex = 29;
+    
+    int _jawOpenIndex = 21;
 };
 
 #endif // hifi_Faceshift_h

interface/src/devices/Visage.cpp

@@ -41,7 +41,6 @@ const glm::vec3 DEFAULT_HEAD_ORIGIN(0.0f, 0.0f, 0.7f);
 
 Visage::Visage() :
     _enabled(false),
-    _active(false),
     _headOrigin(DEFAULT_HEAD_ORIGIN) {
     
 #ifdef HAVE_VISAGE
@@ -119,20 +118,20 @@ static const QMultiHash<QByteArray, QPair<int, float> >& getActionUnitNameMap()
 }
 #endif
 
-const float TRANSLATION_SCALE = 20.0f;
 
+#ifdef HAVE_VISAGE
+const float TRANSLATION_SCALE = 20.0f;
 void Visage::init() {
     connect(DependencyManager::get<Faceshift>().data(), SIGNAL(connectionStateChanged()), SLOT(updateEnabled()));
     updateEnabled();
 }
 
-void Visage::update() {
+void Visage::update(float deltaTime) {
-#ifdef HAVE_VISAGE
+    if (!isActive()) {
-    _active = (_tracker->getTrackingData(_data) == TRACK_STAT_OK);
-    if (!_active) {
         return;
     }
-    PerformanceTimer perfTimer("visage");
+    FaceTracker::update(deltaTime);
+    
     _headRotation = glm::quat(glm::vec3(-_data->faceRotation[0], -_data->faceRotation[1], _data->faceRotation[2]));    
     _headTranslation = (glm::vec3(_data->faceTranslation[0], _data->faceTranslation[1], _data->faceTranslation[2]) -
         _headOrigin) * TRANSLATION_SCALE;
@@ -164,12 +163,12 @@ void Visage::update() {
     }
     _blendshapeCoefficients[leftEyeBlinkIndex] = 1.0f - _data->eyeClosure[1];
     _blendshapeCoefficients[rightEyeBlinkIndex] = 1.0f - _data->eyeClosure[0];
-#endif
 }
 
 void Visage::reset() {
     _headOrigin += _headTranslation / TRANSLATION_SCALE;
 }
+#endif
 
 void Visage::updateEnabled() {
     setEnabled(Menu::getInstance()->isOptionChecked(MenuOption::Visage) &&

interface/src/devices/Visage.h

@@ -31,15 +31,16 @@ class Visage : public FaceTracker, public Dependency {
     SINGLETON_DEPENDENCY
     
 public:
-    void init();
+#ifdef HAVE_VISAGE
+    virtual void init();
+    virtual void update(float deltaTime);
+    virtual void reset();
     
-    bool isActive() const { return _active; }
+    virtual bool isActive() const { return _tracker->getTrackingData(_data) == TRACK_STAT_OK; }
-    
+    virtual bool isTracking() const { return isActive(); }
-    void update();
+#endif
-    void reset();
 
 public slots:
-
     void updateEnabled();
     
 private:
@@ -55,7 +56,6 @@ private:
     void setEnabled(bool enabled);
     
     bool _enabled;
-    bool _active;
 
     glm::vec3 _headOrigin;
 };