Python callback button trigger every frame

[sessionbeer]

This button works every time I press it but is there a way to get it to trigger every frame?

[Atom]

You can add a callback to the playbar. 

def outputPlaybarEvent(event_type, frame):
	# Code here.
	print ("Playbar event", event_type, "at frame", frame)
        
hou.playbar.addEventCallback(outputPlaybarEvent)

Or the Pre-Frame event of a ROP. Code inside the playbar callback won't update when you're rendering.

import hou

frame = int(hou.frame())
print(frame)

 

Edited October 8, 2022 by Atom

[sessionbeer]

Thanks Atom. I'm unsure how to piece together what you've suggested and the callback script that's on node above? 
Where do you put a script on the playbar?

[Atom]

Put the playbar code in a shelf tool, and click the button. Scrub the timeline to observe the print statement. To embed it in a hip file, so it runs every time the file is opened, place the code inside the source editor. You can open the editor under the Windows/Python Source Editor menu along the top of the Houdini app. 

Edited October 8, 2022 by Atom

[sessionbeer]

Thanks, Atom!

 

Edited October 9, 2022 by sessionbeer