Hello,

If I have a checkbox with a python callback script on it, how do I get that callback script to execute when toggling that checkbox via python?!

So I'm toggling the checkbox just with myParm.set(1) for example, but it refuses to execute the python callback attached to the parm ‘myParm’ (callback executes fine when manually toggling the checkbox).

Thanks!

Dean.

I just ran into this problem the other day. You can't set parameters on yourself.

Add a new python node and put the set code in that node and you will be able to trigger the other node's parameter.

It is probably to avoid some cyclic issue…?

The parameter triggers fine, I can turn the checkbox on and off via code but the callback associated with it won't execute.

I don't think its a cyclic thing as checking the checkbox from the python shell also has the same result, the checkbox gets checked, but the callback attached to the checkbox is not executed.

You need to manually trigger the callback with hou.Parm.pressButton()

You are correct!

Captain Hammy strikes again! Nice one Cap.

same problem here but i am trying to trigger the callback script from TOPs

papsphilip
same problem here but i am trying to trigger the callback script from TOPs

this seems to work, when you cook the workitems.

Andr

papsphilip
same problem here but i am trying to trigger the callback script from TOPs

this seems to work, when you cook the workitems.

yes you're right! didn't think to cook, i was expecting a live update as i click through the workitems.
Seems the python script runs only when we cook the node

so after cooking i realised this method is actually not working.

After the python script in my original scene file i attach a rop geometry output and the python script runs for every workitem before that, so when the geometry output saves out my mesh the callback script is not being evaluated.

In order for the callback script to be called every time a workitem is saved to disk i had to write the same python script inside the Rop geometry output-->Scripts-->Pre-Render Script set to python.

This is working for now.

If anyone has a better idea please let me know