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run a python script in Unreal after HDA cooks VAT assets

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johnLIC
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Joined: May 2013
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Is there an easy way to run a python script in Unreal after an HDA is finished cooking? I see options from the Houdini side, but I want to automate the Unreal setup after the VAT ROP is run in an HDA - import the pos and rot textures, import the fbx, set up the material instance, etc. I know that VAT 2.1 has some scripts, and I'm using the materials that have been provided, but I want to run the setup from a python script, since it's basically the same steps every time.
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adam_perin
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Joined: Dec. 2018
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I have done this before by using unreal's remote control api. This allows you to control unreal from a web request.
https://docs.unrealengine.com/en-US/ProductionPipelines/ScriptingAndAutomation/WebControl/QuickStart/index.html [docs.unrealengine.com]

The method I have done is to have a houdini pyhton node at the end that makes a request (request module) that unreal is listening for. And I specifically target the pyhton interp in unreal. Here is a little example of what that could look like from hoduini.


payload = {
            "objectPath": "/Script/PythonScriptPlugin.Default__PythonScriptLibrary",
            "functionName": "ExecutePythonCommandEx",
            "parameters":
                {
                    "PythonCommand": "import my_module\nmy_module.func('{0}')".format(string_arg)
                }
        }

        result = requests.put(UNREAL_ENDPOINT, json=payload)


its a little hacky but has worked well for us
Edited by adam_perin - March 31, 2021 14:25:48
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