protected GraspState GetNewGraspState()
{
HandModel handModel = this.GetComponent <HandModel>();
Hand leapHand = handModel.GetLeapHand();
// check destruction
if (this.CurrentGraspState == GraspState.GRASPED && this.ActiveObject != null)
{
// TODO: implement some kind of check for the overall grip aperture, if it falls
// below a certain threshold, the object should be destroyed and the returned
// state should be 'RELEASED'. Please stick to the initiateDestructionByGrabbing
// method from the ContainerController. To search within the scene you can
// use for instance the FindGameObjectWithTag method.
Vector3 centroid = leapHand.Fingers[1].TipPosition.ToUnityScaled() * .25f + leapHand.Fingers[2].TipPosition.ToUnityScaled() * .25f + leapHand.Fingers[3].TipPosition.ToUnityScaled() * .25f + leapHand.Fingers[4].TipPosition.ToUnityScaled() * .25f;
float distance = Vector3.Distance(leapHand.PalmPosition.ToUnityScaled(), centroid);
if (distance <= GraspController.MIN_FINGER_TO_PALM_DISTANCE)
{
ContainerController containerController = GameObject.FindGameObjectWithTag("Container").GetComponent <ContainerController>();
containerController.initiateDestructionByGrabbing(this.ActiveObject.gameObject);
return(GraspState.RELEASED);
}
}
// power grasp conditions:
// - grabstrength > .5 -> difficult for rotated hands otherwise
if (leapHand.GrabStrength > .35f)
{
return(GraspState.GRASPED);
}
// Scale trigger distance by thumb proximal bone length.
float proximalLength = leapHand.Fingers[0].Bone(Bone.BoneType.TYPE_PROXIMAL).Length;
if (this.CurrentGraspState == GraspState.GRASPED && this.ActiveObject != null)
{
//return GraspState.GRASPED;
// check if fingers point away from palm
Vector3 axis = handModel.GetPalmDirection();
int stretchedFingers = 0;
for (int i = 1; i < 5; i++)
{
Vector3 fingerAxis = handModel.fingers[i].GetRay().direction;
float angle = Vector3.Angle(axis, fingerAxis);
//UnityEngine.Debug.Log(i + ": " + angle);
if (angle > 0 && angle < 40)
{
stretchedFingers++;
}
}
if (stretchedFingers >= 3)
{
return(GraspState.RELEASED);
}
else
{
return(GraspState.GRASPED);
}
}
return(GraspState.RELEASED);
}