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Nguyen2k2
New Participant
March 17, 2025

Interaction SDK Unreal engine 5.5 Dropping Issue

  • March 17, 2025
  • 5 replies
  • 772 views
Hello everyone,
 
I need help with the drop event in the Meta Interaction SDK. I've been using the "Interaction SDK Samples for Unreal Engine" to learn about grabbing mechanics. I found that the grab event uses the Grab Transformer Event, but I couldn't find a corresponding drop event.
 
I tried using the Cancel Grab Event, but it didn’t work as expected.
 
If anyone has experience with this or knows a solution, I would greatly appreciate your help.
 
Thank you!
    This topic has been closed for replies.

    5 replies

    dariomaciel
    Honored Contributor
    March 17, 2025

    I never tried this interaction but maybe there is a function "is it grab" (its grabbed or someting like this) with a boolean. if so, just put on tick and on a branch. I know there is such a node in another sample from meta that uses hand tracking.  what exactly are you trying to accomplish? maybe put a collision on your hand mesh and check when overlaped with the grabed mesh and check later if ends overlaps to execute something

    Nguyen2k2Author
    New Participant
    March 17, 2025
    I'm trying to build a feature where objects are dropped and then snap to a specific location.
     
    Currently, I'm using the method you suggested — I added box colliders to both hands in the hand tracking setup and used Begin Overlap and End Overlap to return a boolean isDropping.
     
    This approach works to some extent, but it’s not always reliable. Sometimes the grabbed object overlaps with both the hand and the snap point simultaneously, causing issues with the snapping behavior.

    That’s why I’m looking for a function that can detect the drop event more accurately.
    dariomaciel
    Honored Contributor
    March 17, 2025

    are you making a puzzle game? I used this kind of behavior in a puzzle game

    kutlaytunc
    kutlaytunc
    Inspiring
    March 18, 2025

    I don't wanna throw shades but that SDK was not reliable on my project also, it is still in experimental stage anyways. If there really is a problem I hope they see your post.

    Nguyen2k2Author
    New Participant
    March 19, 2025

    I found a way to handle this by using the State Changed Delegate (ISDKGrabbable) and checking its state. I'm not entirely sure about its accuracy, but for now, it works well for me. The key is to check the Previous State — if it was "Select," that means it's currently in the "Dropping" state.

     

     

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