XR Interaction Toolkit - Set interactable to unselectable by other interactors while selected

Hey guys a quick question,

Is there a simple way to make an object unable to be selected by other interactors while already selected by another?

EX: interactable is in left hand, right hand should not be able to select it

I can't seem to find a quick and painless way to accomplish this, so I'm sure I'm overlooking something.

 

Did you ever find a solution to this? Currently facing the same problem.

 

Old way to do this was by overriding IsSelectableBy

Code (CSharp):

1. using UnityEngine.XR.Interaction.Toolkit;
2. namespace DoGames.XR
3. {
4.     public class OneHandedGrabInteractable : XRGrabInteractable
5.     {
6.         public bool IsSelectableBy(XRSocketInteractor interactor)
7.         {
8.             return base.IsSelectableBy((XRBaseInteractor)interactor);
9.         }
10.         public override bool IsSelectableBy(XRBaseInteractor interactor)
11.         {
12.             // Prevent object from being selected if it's already selected by something that isn't an XRSocketInteractor.
13.             bool isAlreadyGrabbed = selectingInteractor && (!(selectingInteractor is XRSocketInteractor) && !interactor.Equals(selectingInteractor));
14.             return base.IsSelectableBy(interactor) && !isAlreadyGrabbed;
15.         }
16.     }
17. }

No idea what it is now

 

Can you please confirm if that is indeed the intended functionality of Select Mode: Single? I've had this issue with XRI since 2020 and every time I have attempted a solution I've been unsuccessful. I have updated the project to the most recent version of XRI and selection mode: single does not prevent other interactions from hovering or selecting an object.

 

I found that Select Mode Single did not prevent my hand from targeting an object held by the other hand. My hands would "fight" over the object (rapid transfer from one hand to the other and back). I ended up writing a custom extension of GrabInteractable that doesn't allow selection of an already-held object, based on a Brackey's tutorial. The code is quite simple:

Code (CSharp):

1. using UnityEngine.XR.Interaction.Toolkit;
2.  
3. public class CustomGrabInteractable : XRGrabInteractable
4. {
5.     // Use this instead of XR Grab Interactable to prevent hands fighting over objects.
6.     // Fighting hands can cause hand animations to break, and causes rapid-fire grab sounds.
7.     public override bool IsSelectableBy(IXRSelectInteractor interactor)
8.     {
9.         bool isAlreadyGrabbed = false;
10.        
11.         if (isSelected && !interactor.Equals(firstInteractorSelecting))
12.         {
13.             var grabber = firstInteractorSelecting as XRDirectInteractor;
14.             if (grabber != null)
15.             {
16.                 // the grabber is a direct interactor
17.                 isAlreadyGrabbed = true;
18.             }
19.         }
20.                
21.         return base.IsSelectableBy(interactor) && !isAlreadyGrabbed;
22.     }
23. }