[Houdini] [Python] Make hipfile a light scene data and save it.

InitSave.py

def init_and_save(cn):
    pos = []
    path = cn.path()
    posX = posY = 0
    if len(cn.children()) > 0:
        for node in cn.children():
            pos.append(node.position())
            posX = sum([x[0] for x in pos]) / len(pos)
            posY = max([x[1] for x in pos])

    if not hou.node(path + "/__INIT"):
        null = hou.node(path + "/").createNode("null", "__INIT")
        null.setPosition(hou.Vector2(posX, posY + 1))
    else:
        null = hou.node(path + "/__INIT")

    null.setDisplayFlag(True)
    null.setRenderFlag(True)
    null.setColor(hou.Color((0, 0.5, 1)))
    hou.hipFile.save()


def main():
    editor = hou.ui.paneTabOfType(hou.paneTabType.NetworkEditor)
    current_node = editor.pwd()
    if current_node.childTypeCategory() == hou.sopNodeTypeCategory():
        init_and_save(current_node)


main()

without hou.selectedNodes()

run script in SOP level