Unity - grasping objects with weird physics behaviour

[klocekkonrad]

Hi all!

I need to ask you for help with Leap Motion.

So, I have a scene with my custom VR rig (but with corresponding Leap components, so everything works well), and set up Interaction Engine.
On my scene I have two objects: mesh1 (with MeshCollider), and cube1 (with BoxCollider). Objects have Interaction Behaviour, and I use capsule hand. Objects are non-kinematic.
Grasping works, but probably of rigidbodies in hands and in objects, physics got weird and item is very unstable, sometimes with little motion object explodes.
I tried to use kinematic rigidbodies, but I want my objects to fall after grasping.
Also I tried to set isKinematic = true in events like OnContactStart, OnGraspBegin etc. but it causes the same problem, or hanging object in the air for 1 second after grasping, which is not natural.

Is there any attempt to make it good, or I just need to tune params where contact occurs etc?
Thanks in advance .

Technicals:
1. Unity 5.6.3f1
2. Core Module: 4.3.1
3. Interaction Engine: 1.1.0

[nbenson]

Can you confirm that you don't have RigidRoundHands in your Model Pool object in your rig? They come in the standard Leap rig by default, but they are mutually exclusive with the Interaction Engine and they will cause exactly this sort of interaction instability.

[klocekkonrad]

@nbenson - thank you for your response! Yes, I can confirm. In my HandModels I've got LoPoly_Rigged_Hand_Left / LoPoly_Rigged_Hand_Right (as in Interaction Engine examples), when I change hand models to CapsuleHands experience is the same.

[nbenson]

Sorry, the names are similar, but we're referring to different things. "Rigged Hands" are fine, but I'm asking if you have objects named "RigidRoundHand_L" and "RigidRoundHand_R" -- rigid, not rigged. If you have RigidRoundHands in your scene, you will have problems.

If you don't have RigidRoundHands in your scene, then the problem is elsewhere. It's hard to diagnose without more information. Could you post a screenshot of your scene Hierarchy and rig setup?

[klocekkonrad]

@nbenson - thank you, sorry for late response.
I don't have RiggedHands in my scene, I attach my configuration of rig ==> here (I can't upload images here :/

[nbenson]

Hmm. Your scene setup appears to be fine.

• Is your application hitting (at least) 60 FPS?
• Does your physics fixed timestep match your application framerate? (e.g. for a 90 FPS PC VR application, your physics fixed timestep should be 1/90 = 0.011111...)
• Is your Leap being subjected to lighting conditions that produce a sub-optimal tracking experience? (Do your hands appear to stutter or move around discontinuously?)

Additionally, if you are able to provide a scene to reproduce the issue, or a recording of the problematic physics behavior you are observing, I will be better equipped to address the problem.

[julienkay]

1/90 = 0.11111...)

Just in case someone gets confused by this: You probably mean 0.01111.. right?

[nbenson]

Edited for clarity

[andreasegger]

Any updates on this matter?

I have a very similar problem. When grasping the object the often weirdly jump around or are being very unstable.
Can I fine-tune this somehow?

By the way: When I don't interact with objects the hand tracking is very stable

Thanks

[nbenson]

If you've checked your scene against those bullet points I mentioned above and the issue is still occurring, I'll need an example scene that reproduces the problem, since there isn't an obvious reason why this should be happening. (Again, assuming the bullet points have been checked.)

If you're able to get me a test scene I can poke around in, I can take a look.