Forums Technical Discussion How can I create linked channels on a parm using python?

How can I create linked channels on a parm using python?

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zragozzi
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Joined: 12月 2018
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I'm trying to create and customize a node through a python script. I'm adding parms using the hou.parmTemplate() class and for one of the parameters I need to edit the Channel tab (see below).

I can't seem to find anything in the python documentation on how to do this; anybody know what the best solution would be?

Thanks!

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pajamajama
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Joined: 4月 2019
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Figured it out!
I initially copied everything over using parm templates, then if you access the node.Parms you can copy everything over with parm.set(otherparm), this copies the linked channels to the previously created parmTemplates.

Here's some example code where I'm switching the parent node's parameters based on the node selection from a dynamic menu

def OnSelected():
    #get value of menu
    menuParameter = hou.node("./").parm('pattern');
    selectedId = menuParameter.eval()
    selectedName = menuParameter.menuLabels()[selectedId]
    #set selected node display
    selectedNode = hou.node("./{}".format(selectedName))
    selectedNode.setDisplayFlag(True)
    selectedNode.setRenderFlag(True)
    
    node = hou.node("./")
    
    #add folder for options
    parmGroup = node.parmTemplateGroup()
    if parmGroup.find("options") != None:
        parmGroup.remove(parmGroup.find("options"))
    parmFolder = hou.FolderParmTemplate("options", "Options")
    
   
    #copy parm templates from selected node and add them to options folder
    parmTemplates = selectedNode.parmTemplateGroup().parmTemplates()
    for entry in parmTemplates:
        parmFolder.addParmTemplate(entry)      
    parmGroup.append(parmFolder)
    node.setParmTemplateGroup(parmGroup)
    
    #get actual parms (not templates) from selected node
    selectedParms = selectedNode.parms()
    newParms = node.parms()
    for newParm in newParms:
        for selectedParm in selectedParms:
            if newParm.name() == selectedParm.name():
                #matching template, set it to get linked channels
                newParm.set(selectedParm)
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allenzhang1123
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Joined: 9月 2019
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If you want set A to B, you can just use:

B.parm('some_parm').set(A.parm('some_parm'))

A link in 'some_parm' at A will be created
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