void Awake()
{
//get references from scene
_planeGenerator = FindObjectOfType <GoogleARCore.Examples.Common.DetectedPlaneGenerator>();
_planeDiscoveryGuide = FindObjectOfType <GoogleARCore.Examples.Common.PlaneDiscoveryGuide>();
_pointCloud = FindObjectOfType <GoogleARCore.Examples.Common.PointcloudVisualizer>();
_andyManipulator = FindObjectOfType <GoogleARCore.Examples.ObjectManipulation.AndyPlacementManipulator>();
_manipulationSystem = FindObjectOfType <GoogleARCore.Examples.ObjectManipulation.ManipulationSystem>();
_objectManipulationController = FindObjectOfType <GoogleARCore.Examples.ObjectManipulation.ObjectManipulationController>();
}