Add pinch ray API and update pinched threshold value

* Pinch ray to use origin and direction values from engine
* Update pinched threshold value to >= 0.5

Author: ChengNan Yang

Assets/HTC.UnityPlugin/VRModule/Submodules/WaveHandTrackingSubmodule.cs

@@ -39,7 +39,7 @@ public void Fetch()
         }
 
         private DeviceFeature deviceFeature;
-        private TrackingActivator trackingActivator = TrackingActivator.Default;
+        private static TrackingActivator trackingActivator = TrackingActivator.Default;
         private GestureActivator gestureActivator = GestureActivator.Default;
         private uint leftDeviceIndex = VRModule.INVALID_DEVICE_INDEX;
         private uint rightDeviceIndex = VRModule.INVALID_DEVICE_INDEX;
@@ -186,6 +186,40 @@ protected override void OnUpdateDeviceInput()
 
         public override uint GetRightHandedIndex() { return rightDeviceIndex; }
 
+        public static bool TryGetLeftPinchRay(out Vector3 origin, out Vector3 direction)
+        {
+            if (!trackingActivator.isLeftValid)
+            {
+                origin = Vector3.zero;
+                direction = Vector3.zero;
+
+                return false;
+            }
+
+            var pinch = trackingActivator.getLeftPinchData;
+            Coordinate.GetVectorFromGL(pinch.pinch.origin, out origin);
+            Coordinate.GetVectorFromGL(pinch.pinch.direction, out direction);
+
+            return true;
+        }
+
+        public static bool TryGetRightPinchRay(out Vector3 origin, out Vector3 direction)
+        {
+            if (!trackingActivator.isRightValid)
+            {
+                origin = Vector3.zero;
+                direction = Vector3.zero;
+
+                return false;
+            }
+
+            var pinch = trackingActivator.getRightPinchData;
+            Coordinate.GetVectorFromGL(pinch.pinch.origin, out origin);
+            Coordinate.GetVectorFromGL(pinch.pinch.direction, out direction);
+
+            return true;
+        }
+
         private enum FeatureActivity
         {
             Stopped,
@@ -462,6 +496,10 @@ public bool TryFetchData(WVR_PoseOriginModel originModel)
 
             public bool isRightValid { get { return trackingData.right.isValidPose; } }
 
+            public WVR_HandPoseState_t getLeftPinchData { get { return pinchData.left; } }
+
+            public WVR_HandPoseState_t getRightPinchData { get { return pinchData.right; } }
+
             public void UpdateJoints(IVRModuleDeviceStateRW state, bool isLeft)
             {
                 var data = isLeft ? trackingData.left : trackingData.right;
@@ -482,7 +520,7 @@ public void UpdateJoints(IVRModuleDeviceStateRW state, bool isLeft)
             public void UpdateDeviceInput(IVRModuleDeviceStateRW state, bool isLeft)
             {
                 var pinch = isLeft ? pinchData.left : pinchData.right;
-                var pinched = pinch.pinch.strength >= 0.95f;
+                var pinched = pinch.pinch.strength >= 0.5f;
 
                 state.SetButtonPress(VRModuleRawButton.GestureIndexPinch, pinched);
                 state.SetButtonTouch(VRModuleRawButton.GestureIndexPinch, pinched);