[FIXED] Freeze fingers position while grasping an object and attach it to the palm

[NerdGirl88]

Hello,
I'm a master degree student and I'm working with Leap Motion + HTC Vive in Unity for my thesis.

In the application that I am developing the main activity is to take surgical instruments (like bisturi) and perform certain actions; the problem is that the interaction with these object using InteractionManager and InteractionBehaviuor is not natural and stable, so we want to try to attach them like a magnet at the palm/hand in a fixed position and, at the same time, freeze fingers position while we are grasping the object (we try to use detection of certain gesture, like pinch, with attachment's logic).

Someone has an idea on how I can accomplish it?

Thanks so much to anyone who tries to help me out.

[NerdGirl88]

Anybody?
Come on guys!

[alisiamartz]

Hey! I'm trying to figure this out as well, and can't seem to find good documentation on it. You wrote that you fixed it, do you mind explaining how? Thank you so much for your post!

[AlexColgan]

Our assets aren't really designed to artificially control the hand's positions (compared to the real-world hand) and we generally recommend against it. The Interaction Engine has also gotten a lot better at handling small objects. From the FAQ:

If you need to be able to grasp a very small object and the object's physical colliders don't produce good grasping behaviors, try adding a new primitive collider for the object, such as a SphereCollider, with a larger radius than the object itself, and with isTrigger set to true. As long as the InteractionBehaviour is not ignoring grasping, you will be able to grasp the object by this trigger volume.

However, you don't want a grasping-only trigger collider to be too much larger than the object itself. In general, the larger the grasping volume is around an object, the more likely the user is to accidentally grasp objects when they don't intend to. Additionally, having overlapping grasping-only trigger colliders from multiple objects will prevent the grasp classifier from correctly picking which object to grasp.

[alisiamartz]

Thanks for your response! Seriously appreciated.

Along the lines of this post (https://community.leapmotion.com/t/suggestions-for-use-with-a-steering-wheel/6463), if I wanted to manipulate the hand model when it gets close to an object, would that model be something adjusted in Unity through Leap scripts or separately in a modeling program? Just wanted to clarify, I have been messing around with the scripts for a while at this point with no clear answer.

[AlexColgan]

It would probably involve a script that unbinds the rigged hands from the Leap Motion hand tracking and triggers an animation instead.

[alisiamartz]

Thank you so much! Such a huge help, will get to working on that now.