Houdini - How to set multiparm defaults.

set_multi_parm_defaults.py

lod_presets = [100, 50, 25, 12, 6]


def set_hda_defaults(hda):
  hda.parm("lod_levels").set(5)
  # if we have a classname detail attrib use that
  class_name = hda.geometry(0).findGlobalAttrib("classname")
  if class_name:
    hda.parm("sopoutput").set("$HIP/`chs('./base_name')`.fbx")
    hda.parm("base_name").set(class_name.strings()[0])
  else:
    hda.parm("base_name").set(hda.inputConnections()[0].inputNode().name())
  for x in range(5):
    hda.parm("reduction_amt%s" % (x + 1)).set(lod_presets[x])