# InteractionEndEvent for TransformNode

**URL:** <https://discourse.slicer.org/t/interactionendevent-for-transformnode/37852>\
**Category:** Development\
**Created:** [August 13, 2024, 12:10pm UTC](https://discourse.slicer.org/t/interactionendevent-for-transformnode/37852 "2024-08-13T12:10:04Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![park](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/park/32/5717_2.png) [@park](https://discourse.slicer.org/u/park)\
**Post date:** [August 13, 2024, 12:10pm UTC](https://discourse.slicer.org/t/interactionendevent-for-transformnode/37852/1 "2024-08-13T12:10:04Z")

</div>

Hello,

I would like to trigger an event when the interaction with the transform node’s handles in Slicer 5.7 ends after modifying the transform (similar to the `PointEndInteractionEvent` feature in Markups).

So far, I’ve been using the following code:

```auto
transformNode.AddObserver(slicer.vtkMRMLTransducerNode.TransformModifiedEvent, myFunction)

```

However, with this approach, the event keeps firing continuously during the transformation, which consumes a lot of computing power.

Is there an existing feature for this, or would I need to implement a custom event? Any advice would be greatly appreciated.