Listen/Subscribe to selection changed events

Omniverse General Discussion
1

Hello, I have been searching through the documentation on how to listen to selection events, I tried event stream and I tried the USD notification system (TfNotice) but with not luck. Basically I want to limit the user selection to a certain depth in the stage tree so I need to listen if the selection event and change the selection target accordingly.

Thank you.

2

For selection changes you would want to Stage Events for selection

import carb.events
import omni.usd


def on_stage_event(e: carb.events.IEvent):
	if e.type == int(omni.usd.StageEventType.SELECTION_CHANGED):
		print("selection changed")


stage_event_sub = (
	omni.usd.get_context()
	.get_stage_event_stream()
	.create_subscription_to_pop(on_stage_event, name="My Subscription Name")
)

Here’s a sample extension that utilizes the selection changed event: GitHub - NVIDIA-Omniverse/kit-extension-sample-ui-scene: Sample Repository to create Kit Extension using the ui.scene API

3

Great thank you.

4

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