Oculus hand momentum/inertia

Okay so I'm currently working on a Vr project and I used Oculus Sample FrameWork in order to get the hands working.
So I didn't write that part:
When my character moves, the hands have inertia, like they are a bit late with any of the movement (just when I walk, when I move my hands alone no problem). And to be honest it's quite annoying.

I found That:

Code (CSharp):

1. // Hands follow the touch anchors by calling MovePosition each frame to reach the anchor.
2. // This is done instead of parenting to achieve workable physics. If you don't require physics on
3. // your hands or held objects, you may wish to switch to parenting.
4. void OnUpdatedAnchors()
5. {
6. Vector3 handPos = OVRInput.GetLocalControllerPosition(m_controller);
7. Quaternion handRot = OVRInput.GetLocalControllerRotation(m_controller);
8. Vector3 destPos = m_parentTransform.TransformPoint(m_anchorOffsetPosition + handPos);
9. Quaternion destRot = m_parentTransform.rotation * handRot * m_anchorOffsetRotation;
10. GetComponent<Rigidbody>().MovePosition(destPos);
11. GetComponent<Rigidbody>().MoveRotation(destRot);
12. 
    
13. if (!m_parentHeldObject)
14. {
15. MoveGrabbedObject(destPos, destRot);
16. }
17. m_lastPos = transform.position;
18. m_lastRot = transform.rotation;
19. 
    
20. float prevFlex = m_prevFlex;
21. // Update values from inputs
22. m_prevFlex = OVRInput.Get(OVRInput.Axis1D.PrimaryHandTrigger, m_controller);
23. 
    
24. CheckForGrabOrRelease(prevFlex);
25. }

I'm quite sure the problem comes from here...
But to be honest I have no idea how to switch to parenting because if I do it via the editor, My hands are just elsewhere, and not even moving accordingly but far...
If you Have any ideas I would be super glade ^^
Thank you very much!

 

No, I don't believe the above code is the problem.

More likely it's some sort of smoothing that happens when you move. How exactly are you doing character movement?

 

I have A character Controller in order to move my "cameras" and my hands anchor.
However My "physical" hands are not parented to that, they are the children of an other gameObject... To be honest I did'nt make that part.
I fond this part of code in the script attached to the "physical" hands and it seems like it is what actually manage the "physical" hands position. It's called each frame And I do believe that my hand could be a frame late on the moving of my character.

 

Code (CSharp):

1. GetComponent<Rigidbody>().MovePosition(destPos);
2. GetComponent<Rigidbody>().MoveRotation(destRot);

MovePosition and MoveRotation use interpolation:
https://docs.unity3d.com/ScriptReference/Rigidbody.MovePosition.html

You could try and set the pos/rot immediately per frame and see if it's less laggy:

Code (CSharp):

1. GetComponent<Rigidbody>().position = destPos;
2. GetComponent<Rigidbody>().rotation = destRot;

 

I'll try! Thanks you very much @SiliconDroid
However if it happens to "unsmooth" the movement when I just move my hands, for instance to grab an object, Would it be possible to lower the time to travel from point A to B with Move position? So when I walk it's less laggy? I'll try to and keep you posted!

Thanks guys

 

I don't know the quality of the data for the hand movement, I've had no experience with VR other than 3DOF headsets and 3DOF controllers, but the data they give is nicely preconditioned, no further smoothing required. Do keep us posted I'm interested in your result...

 

MovePosition and MoveRotation do _instant_ interpolation. All this means is that the physics engine has a chance to see whether the proposed movement/rotation collides with anything. It doesn't mean that it applies any smoothing, or otherwise introduces any lag (assuming your physics engine is running at at least frame rates).

I still believe the problem is in the character controller. It's probably doing some Lerp abuse or similar, and this is causing the apparent lag in the hands.

 

Okay Guys, so I tried

Code (CSharp):

1. GetComponent<Rigidbody>().position = destPos;
2. GetComponent<Rigidbody>().rotation = destRot;

Well it did'nt change ANYTHING same movement, same lag...
I think parenting could maybe do something? The positioning would'nt be dependant on FixedUpdate()
But to be honest I really don't know how to do that in that case... When I do iy via the editor it breaks everything and via script I'm Kind of lost because of all the variables that are necessary or not for so much different things?
Could you help me? Please?

Thanks Guys for your help @JoeStrout and @SiliconDroid

 

No, parenting won't help. The current code moves the controllers instantly to the proper position relative to the character controller.

I still suspect the problem is in the character controller code. But there's nothing more I can do from here to help you pin that down.

 

In OVRGrabber.cs, could try changing:

Code (CSharp):

1.     void FixedUpdate()
2.     {
3.         if (operatingWithoutOVRCameraRig)
4.             OnUpdatedAnchors();
5.     }

to:

Code (CSharp):

1.     void LateUpdate()
2.     {
3.         if (operatingWithoutOVRCameraRig)
4.             OnUpdatedAnchors();
5.     }

 

Thanks Guys!
@SiliconDroid
Well I tried, Still the same lag, I'm trying to fix that to but, nothing works. T-T
@JoeStrout
May be you're right...


I think That the way my hands are just makes lag.. I dunno! I'll keep you posted if I find something.
I just saw that, the faster I go, the more the hands stay behind! Maybe Something to understand from that! ^^ Still thinking

Thanks youuuu <3

 

@StayTalm_Unity Here's my hierarchy:
I have 2 groups independent from one another: The yellow one and the other.
In the first one I have: My three cameras,(a menu but we don't care), and the transform of my real hands : the tracking data from the sensors on my desk IRL.

Then I have, in Dynamic, my physical and visual hands (those should be mapped to my tracking data but not following those really well) in the game, they have the mesh renderer and many different colliders for different purpose I guess

 

Hello @StayTalm_Unity
Yes the dynamic hands feels laggy with what could happen to be a 1 frame delay.
When I put the visual like you said the anchors are just lost somewhere in my scene.. I don't understand nothing anymore to be honest...
I'll just keep twiking some stuff and we we'll see

Thanks mate for your help!

 

Thanks mate!
My hands are not elsewhere, they are just laggy. No scaling, but I will definitely try to check the local positions if I do something with parenting.

Thanks you @StayTalm_Unity