Fix rotation interpolation

CameraRoll/CameraRoll/manifest.jecs

@@ -1,7 +1,7 @@
 ID: D4VID_CameraRoll
 Name: CameraRoll
 Author: D4VID
-Version: 0.1.0
+Version: 0.2.0
 Priority: 0
 ClientOnly: true
 Dependencies:

CameraRoll/CameraRoll/src/client/tool/CameraRollTool.cs

@@ -104,13 +104,12 @@ namespace CameraRoll.Client.Tool {
                 _interpolationState += InterpolationSpeed;
                 
                 Vector3 prevPos = GetPos(_pointIndex - 1);
-                Vector3 posDiff = GetPos(_pointIndex) - prevPos;
-                _cam.transform.position = prevPos + posDiff * _interpolationState;
+                Vector3 newPos = GetPos(_pointIndex);
+                _cam.transform.position = Vector3.Lerp(prevPos , newPos, _interpolationState);
 
-                Vector3 prevRot = GetRot(_pointIndex - 1);
-                Vector3 rotDiff = GetRot(_pointIndex) - prevRot;
-                _cam.transform.eulerAngles = prevRot + rotDiff * _interpolationState;
-                // TODO: interpolate across the shorter direction of rotation
+                Quaternion prevRot = GetRot(_pointIndex - 1);
+                Quaternion newRot = GetRot(_pointIndex);
+                _cam.transform.rotation = Quaternion.Slerp(prevRot, newRot, _interpolationState);
                 
                 if (_interpolationState >= 1.0f) {
                     _pointIndex++;
@@ -120,7 +119,7 @@ namespace CameraRoll.Client.Tool {
         }
 
         private static Vector3 GetPos(int index) => PathPoints[index].transform.position;
-        private static Vector3 GetRot(int index) => PathPoints[index].transform.eulerAngles;
+        private static Quaternion GetRot(int index) => PathPoints[index].transform.rotation;
 
         public static void OnExit() {
             Clear();