first attempt at palm rotation

interface/src/avatar/AvatarActionHold.cpp

@@ -52,15 +52,19 @@ void AvatarActionHold::updateActionWorker(float deltaTimeStep) {
     }
 
     glm::vec3 palmPosition;
+    glm::quat palmRotation;
     if (_hand == "right") {
         palmPosition = myAvatar->getRightPalmPosition();
+        palmRotation = myAvatar->getRightPalmRotation();
     } else {
         palmPosition = myAvatar->getLeftPalmPosition();
+        palmRotation = myAvatar->getLeftPalmRotation();
     }
 
     auto rotation = myAvatar->getWorldAlignedOrientation();
     auto offset = rotation * _relativePosition;
     auto position = palmPosition + offset;
+    rotation *= palmRotation;
     rotation *= _relativeRotation;
     unlock();
 

interface/src/avatar/MyAvatar.cpp

@@ -371,6 +371,19 @@ glm::vec3 MyAvatar::getLeftPalmPosition() {
     return leftHandPosition;
 }
 
+glm::quat MyAvatar::getLeftPalmRotation() {
+    unsigned int leftIndex = 0;
+    if (getHand()->getNumPalms() > leftIndex) {
+        PalmData& palm = getHand()->getPalms()[leftIndex];
+        if (palm.isActive()) {
+            glm::vec3 tipDirection = glm::normalize(palm.getTipPosition() - palm.getPosition());
+            glm::vec3 avatarDirection = glm::vec3(0.0f, 0.0f, 1.0f) * getOrientation();
+            return rotationBetween(avatarDirection, tipDirection);
+        }
+    }
+    return glm::quat();
+}
+
 glm::vec3 MyAvatar::getRightPalmPosition() {
     glm::vec3 rightHandPosition;
     getSkeletonModel().getRightHandPosition(rightHandPosition);
@@ -380,6 +393,19 @@ glm::vec3 MyAvatar::getRightPalmPosition() {
     return rightHandPosition;
 }
 
+glm::quat MyAvatar::getRightPalmRotation() {
+    unsigned int rightIndex = 1;
+    if (getHand()->getNumPalms() > rightIndex) {
+        PalmData& palm = getHand()->getPalms()[rightIndex];
+        if (palm.isActive()) {
+            glm::vec3 tipDirection = glm::normalize(palm.getTipPosition() - palm.getPosition());
+            glm::vec3 avatarDirection = glm::vec3(0.0f, 0.0f, 1.0f) * getOrientation();
+            return rotationBetween(avatarDirection, tipDirection);
+        }
+    }
+    return glm::quat();
+}
+
 void MyAvatar::clearReferential() {
     changeReferential(NULL);
 }

interface/src/avatar/MyAvatar.h

@@ -195,10 +195,12 @@ public slots:
     void setThrust(glm::vec3 newThrust) { _thrust = newThrust; }
 
     void updateMotionBehavior();
-    
+
     glm::vec3 getLeftPalmPosition();
+    glm::quat getLeftPalmRotation();
     glm::vec3 getRightPalmPosition();
-    
+    glm::quat getRightPalmRotation();
+
     void clearReferential();
     bool setModelReferential(const QUuid& id);
     bool setJointReferential(const QUuid& id, int jointIndex);