Forums PDG/TOPs How to create custom PDG Python Processor preset

How to create custom PDG Python Processor preset

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tung
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Hi all,

I am wondering if there is a way to create custom “preset” for PDG's Python Processor node like Parm Evaluation, Clone Upstream Items, etc.?

Thank you.
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tpetrick
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Yes, that's possible. The presets used on TOP nodes are implemented using Houdini's standard parm preset builder, which will look for file(s) named “PythonScripts.txt” on the Houdini search path. You can add a file with that name to your Houdini Path and put custom preset definitions in there. For example, on Linux you'd save the custom presets file to $HOME/houdini18.0/PythonScript.txt.

The snippet entries should start with the parm name the preset belongs to, then the name of the preset in the menu, and finally the code itself. For example:

Top/pythonprocessor/generate
    My Custom Snippet Name
    import hou
    print(hou.pwd())

Top/pythonprocessor/generate
    My Other Snippet Name
    print("hello")

You can also check $HH/PythonScripts.txt for reference, which contains all of the parm presets for the various Python nodes shipped with Houdini.
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tung
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Awesome, I'll try this out. Thanks a lot for your answer @tpetrick.

Cheers,
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tung
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Hello again,

I am just back to this topic after a while.

I am currently looking for a way to trigger some custom parameters generate when I click on my custom preset. Would that be possible?

Cheers,
Tung
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BrookeA
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To clarify – you want to add some custom parameters to the node's interface when your custom preset is selected?
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tung
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BrandonA
To clarify – you want to add some custom parameters to the node's interface when your custom preset is selected?
Hi Brandon, yes. That's what I am after.

Thank you.
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tung
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Hi @BrandonA,

Do you know if there is a way for such thing in current Houdini?
BrandonA
To clarify – you want to add some custom parameters to the node's interface when your custom preset is selected?

Cheers,
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BrookeA
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If you are able to trigger a Python callback, you can add spare parameters to your node's interface. To do this you will need to make use of hou.ParmTemplateGroup(https://www.sidefx.com/docs/houdini/hom/hou/ParmTemplateGroup.html).

Here is an example code snippet from the documentation:

node = hou.node("/obj").createNode("geo")
group = node.parmTemplateGroup()
folder = hou.FolderParmTemplate("folder", "My Parms")
folder.addParmTemplate(hou.FloatParmTemplate("myparm", "My Parm", 1))
group.append(folder)
node.setParmTemplateGroup(group)
Edited by BrookeA - July 29, 2020 19:52:01
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