Hand Animation in XR Interaction Toolkit

Hi all,
I'm creating a VR game with XR Interaction Toolkit. At the moment I'm interacting with virtual object with a laser interactor. I'd like to use human hands that animate properly when I press specific buttons on my controller (Oculus Quest trigger, and lateral button).

Oculus quest sample projects (not using XT Interaction Toolkit) allows to achieve that with 2 hands controlled by an animator for each one. Is there something similar for XR Interaction toolkit too?
Any sample project?

Thank you

 

I'm not aware of a ready to use solution, but you can make something like this from scratch without much difficulty. The simplest implementation is just a basic blend tree with multiple hand poses.

 

the oculus plugin contains rigged hands with some poses and blend tree, but it could be quite difficult to control it with XR Interaction Toolkit.
Does anyone did it?

 

Eureka!!!
Maybe I found the solution I needed!
Using Oculus Integration Hand Animations with Unity XR Kit | by Kyle Pastor | datastuffplus | Medium

I'll try it asap, but for logic I think this solution should work!

 

I'm posting a update to this tutorial, because I wanted to use it with the new input system so I needed to edit the script.
I used the XRI Default Input Actions included with Unity's XR Interaction Toolkit plugin in the Starter Assets Samples. The only other thing I did was add make a separate Thumb Touched button action in both Hand Interaction Action Maps of the XRI Default Input Action.inputactions, I filled it with bindings like secondaryTouched, primaryTouched, thumbstickTouched, thumbtouch, and thumbresttouch.

Code (CSharp):

1. using UnityEngine;
2. using UnityEngine.InputSystem;
3. using System.Linq;
4.  
5. /// <summary>
6. /// This is an adaption of both Oculus's HandPose and Hand scripts (located in Oculus' Inegration SDK's SampleFramework https://developer.oculus.com/downloads/package/unity-integration/) and Kyle Pastor's Oculus Integration Hand Animations HandAnim script found:
7. /// https://medium.com/datastuffplus/using-oculus-integration-hand-animations-with-unity-xr-kit-e707b6acb0a2 I've adapted it to use Unity's XR interaction system. I used the XRI Default Input Actions included with Unity's XR Interaction Toolkit plugin in the
8. /// Starter Assets Samples. The only other thing I did was make a separate Thumb Touched button action in both Hand Interaction Action Maps of the XRI Default Input Action.inputactions, I filled it with bindings  like secondaryTouched, primaryTouched,
9. /// thumbstickTouched, thumbtouch, and thumbresttouch.
10. /// </summary>
11.  
12. public class HandAnim : MonoBehaviour
13. {
14.     [SerializeField] private Animator m_animator = null;
15.     [SerializeField] private InputActionReference selectValueAction, activateValueAction, thumbTouchedAction;
16.  
17.     private const string ANIM_LAYER_NAME_POINT = "Point Layer", ANIM_LAYER_NAME_THUMB = "Thumb Layer", ANIM_PARAM_NAME_FLEX = "Flex", ANIM_PARAM_NAME_POSE = "Pose", ANIM_PARAM_NAME_PINCH = "Pinch";
18.     private const float INPUT_RATE_CHANGE = 20.0f;
19.     private int m_animLayerIndexThumb = -1, m_animLayerIndexPoint = -1, m_animParamIndexFlex = -1, m_animParamIndexPose = -1, m_animParamIndexPinch = -1;
20.     private bool m_isPointing = false, m_isGivingThumbsUp = false;
21.     private float m_pointBlend = 0.0f, m_thumbsUpBlend = 0.0f;
22.     private Collider[] m_colliders = null;
23.  
24.     private enum HandPoseId
25.     {
26.         Default, //0
27.         Generic, //1
28.         PingPongBall, //2
29.         Controller //3
30.     }
31.  
32.     // Start is called before the first frame update
33.     private void Start()
34.     {
35.         m_colliders = GetComponentsInChildren<Collider>().Where(childCollider => !childCollider.isTrigger).ToArray();
36.         for (int i = 0; i < m_colliders.Length; ++i)
37.         {
38.             m_colliders[i].enabled = false;
39.         }
40.  
41.         m_animLayerIndexPoint = m_animator.GetLayerIndex(ANIM_LAYER_NAME_POINT);
42.         m_animLayerIndexThumb = m_animator.GetLayerIndex(ANIM_LAYER_NAME_THUMB);
43.         m_animParamIndexFlex = Animator.StringToHash(ANIM_PARAM_NAME_FLEX);
44.         m_animParamIndexPose = Animator.StringToHash(ANIM_PARAM_NAME_POSE);
45.         m_animParamIndexPinch = Animator.StringToHash(ANIM_PARAM_NAME_PINCH);
46.  
47.         selectValueAction.action.performed += OnGrip;
48.         activateValueAction.action.performed += OnPointOrPinch;
49.         thumbTouchedAction.action.started += OnThumbTouch;
50.         thumbTouchedAction.action.canceled += OnThumbTouch;
51.     }
52.  
53.     private void OnDestroy()
54.     {
55.         selectValueAction.action.performed -= OnGrip;
56.         activateValueAction.action.performed -= OnPointOrPinch;
57.         thumbTouchedAction.action.started -= OnThumbTouch;
58.         thumbTouchedAction.action.canceled -= OnThumbTouch;
59.     }
60.     // Update is called once per frame
61.     private void Update()
62.     {
63.         m_animator.SetInteger(m_animParamIndexPose, (int)HandPoseId.Default);
64.  
65.         m_pointBlend = Mathf.Clamp01(m_pointBlend + (Time.deltaTime * INPUT_RATE_CHANGE) * (m_isPointing ? 1.0f : -1.0f));
66.         m_thumbsUpBlend = Mathf.Clamp01(m_thumbsUpBlend + (Time.deltaTime * INPUT_RATE_CHANGE) * (m_isGivingThumbsUp ? 1.0f : -1.0f));
67.         m_animator.SetLayerWeight(m_animLayerIndexPoint, m_pointBlend);
68.         m_animator.SetLayerWeight(m_animLayerIndexThumb, m_thumbsUpBlend);
69.     }
70.  
71.     private void OnGrip(InputAction.CallbackContext ctx)
72.     {
73.         m_animator.SetFloat(m_animParamIndexFlex, ctx.ReadValue<float>());
74.     }
75.  
76.     private void OnPointOrPinch(InputAction.CallbackContext ctx)
77.     {
78.         m_isPointing = !ctx.ReadValueAsButton();
79.         m_animator.SetFloat(m_animParamIndexPinch, ctx.ReadValue<float>());
80.     }
81.  
82.     private void OnThumbTouch(InputAction.CallbackContext ctx)
83.     {
84.         m_isGivingThumbsUp = !ctx.ReadValueAsButton();
85.     }