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Basic Python Parameter creation workflow in Houdini: https://gfxhacks.com/create-parameters-in-houdini-with-python
# get node (find the path in your node's info panel)
n = hou.node("/path/to/node")
# get existing list of parameters for the specified node
g = n.parmTemplateGroup()
# define new float parameter ("id", "Label", components/input fields, default values)
p = hou.FloatParmTemplate("myParm", "My Parameter", 3, default_value=[1, 1, 1])
# append the new parameter to the list
g.append(p)
# apply changes
n.setParmTemplateGroup(g)
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