Here is the content of the shelf tool labeled Karma from this file: $HFS/houdini/toolbar/ExtraLopTools.shelf
import loptoolutils node = loptoolutils.genericTool(kwargs, 'karmarenderproperties', 'karmarendersettings') node.setCurrent(True) nodename = node.name() kwargs['inputnodename'] = nodename kwargs['inputs'] = [(nodename, 0)] kwargs['nodepositionx'] = str(node.position().x()) kwargs['nodepositiony'] = str(node.position().y() - 0.5) rop = loptoolutils.genericTool(kwargs, 'usdrender_rop') rop.parm("rendersettings").setExpression('chs("../%s/primpath")' % nodename) rop.parm("husk_instantshutter").setExpression('1 - ch("../%s/enablemblur")' % nodename) node.setCurrent(True) node.setSelected(True)