How can I use the depth of the Kinect for my overlayObject ?

Hello !

I'm currently working on a kind of squash game and I want to use the depth provided by the Kinect v2 as my overlayObject z coordinate. The overlayObject x and y are based on the right hand posJoint.

Right now my code is like that :

 void Update ()
     {
         KinectManager manager = KinectManager.Instance;
         
         if (manager && manager.IsInitialized () && foregroundCamera) {
             //backgroundImage.renderer.material.mainTexture = manager.GetUsersClrTex();
             if (backgroundImage && (backgroundImage.texture == null)) {
                 backgroundImage.texture = manager.GetUsersClrTex ();
             }
             
             // get the background rectangle (use the portrait background, if available)
             Rect backgroundRect = foregroundCamera.pixelRect;
             PortraitBackground portraitBack = PortraitBackground.Instance;
             
             if (portraitBack && portraitBack.enabled) {
                 backgroundRect = portraitBack.GetBackgroundRect ();
             }
 
             // overlay the joint
             long userId = manager.GetUserIdByIndex(playerIndex);
 
             int iJointIndex = (int)trackedJoint;
             if (manager.IsJointTracked (userId, iJointIndex)) 
             {
                 Vector3 posJoint = manager.GetJointPosColorOverlay(userId, iJointIndex, foregroundCamera, backgroundRect);
                 posJoint.z = -8f;
 
                 if (posJoint != Vector3.zero) 
                 {
 
                     if (overlayObject) 
                     {
                         overlayObject.position = posJoint;
                     }
                 }
             } 
             else 
             {
                 // make the overlay object invisible
                 if (overlayObject && overlayObject.position.z > 0f) 
                 {
                     Vector3 posJoint = overlayObject.position;
                     posJoint.z = -8f;
                     overlayObject.position = posJoint;
                 }
             }
         }
     }

As you can see, I restricted the overlayObject z axis to -8, but I'd like it to go forward when the right hand is near the camera and backwards when the hand is far from it.