Hi all, I'm creating a new python PDG scheduler and trying to work out the exact relationship between it's python definition and it's TOP node HDA and UI in general.

If I register a custom python scheduler and want to edit the UI seems like I need to create a HDA from it. But once I've done that what's the relationship between the python script and the HDA and the "templateBody"?

I'm also hard pressed on finding any info about how templates work as well.

Looking at the tractor and deadline python code isn't much help, everything seems to have a mish-mash of some UI params defined in templateBody, some in the HDA. Then some params are prefixed with I PDG_ and some with the parmprefix defined in the scheduler python class.

Can someone help fit this all together? Thanks!!

Random notes:

• Found this https://sourcegraph.com/github.com/CGRU/cgru/-/blob/plugins/houdini/pdg/types/afanasyscheduler.py [sourcegraph.com]
  
  Where they don't even use templateBody
  
• Found that when you convert a Scheduler defined by a python file to a HDA there's two schedulers listed, until you restart Houdini
  
• If you define a parm in templateBody after you've "converted" the script to HDA, it doesn't automatically show up in the UI, but it exists somehow in the context of the TOP node, since if you try and create a parm in the HDA properties with the same name it adds the 2 after it. So not sure how you're supposed to add new parms to templateBody after you've converted to HDA.