/// <summary>
/// Called when the object transitions from one <see cref="GrabState"/> to another.
/// </summary>
/// <param name="state">The state the object should transition to.</param>
private void ChangeObjectState(GrabState state)
{
_currentGrabState = state;
switch (state)
{
// Inform the object that it has been ungrabbed and set it to not be kinematic.
case GrabState.Idle:
IsObjectGrabbing = false;
_grabbedObject.ObjectUngrabbed();
_grabbedObjectRigidBody.isKinematic = false;
break;
// When the user starts grabbing the object, save the object and store its animation values.
case GrabState.Grabbing:
IsObjectGrabbing = true;
_grabbedObject = _focusedGameObject;
_grabbedObject.ObjectGrabbing();
_grabbedObjectRigidBody = _focusedGameObject.GetComponent <Rigidbody>();
_grabbedObjectRigidBody.isKinematic = true;
_startObjectRotation = _grabbedObject.transform.rotation;
_startControllerRotation = ControllerManager.Instance.Rotation;
_startPosition = _grabbedObject.transform.position;
_grabAnimationProgress = 0f;
break;
// When the object becomes grabbed to the controller, call the grabbed method and set the object's position to the hand.
case GrabState.Grabbed:
ControllerManager.Instance.TriggerHapticPulse(2000);
_grabbedObject.ObjectGrabbed();
_grabbedObject.transform.position = ControllerManager.Instance.Position;
break;
}
}
/// <summary>
/// Store the values attached to focused object.
/// </summary>
/// <param name="focusedObject">The new focused object to store.</param>
private void SetNewFocusedObject(GameObject focusedObject)
{
_focusedGameObject = focusedObject.GetComponent <GazeGrabbableObject>();
_objectGazeStickinessSeconds = _focusedGameObject.GazeStickinessSeconds;
_animationCurve = _focusedGameObject.AnimationCurve;
_flyToControllerTimeSeconds = _focusedGameObject.FlyToControllerTimeSeconds;
_focusedGameObjectTime = Time.time;
}
/// <summary>
/// Updates the currently focused <see cref="GazeGrabbableObject"/> and keeps it focused for the time set by the object, <see cref="GazeGrabbableObject.GazeStickinessSeconds"/>.
/// </summary>
private void UpdateFocusedObject()
{
// Check whether Tobii XR has any focused objects.
foreach (var focusedCandidate in TobiiXR.FocusedObjects)
{
var focusedObject = focusedCandidate.GameObject;
// The candidate list is ordered so that the most likely object is first in the list.
// So let's try to find the first focused object that also has the GazeGrabbableObject component and save it.
if (focusedObject != null && focusedObject.GetComponent <GazeGrabbableObject>())
{
SetNewFocusedObject(focusedObject);
break;
}
}
// If enough time has passed since the object was last focused, mark it as not focused.
if (Time.time > _focusedGameObjectTime + _objectGazeStickinessSeconds)
{
_focusedGameObjectTime = float.NaN;
_focusedGameObject = null;
_objectGazeStickinessSeconds = 0f;
}
}