Easiest way to get multiparm instance index

multiparm_instance_index.py

# Callbacks
idx = kwargs["script_multiparm_index"]

# In a parameter expression
idx = evaluatingParm().multiParmInstanceIndices[0] # Returns a tuple. Will need subscript for the right level, and test for IndexError

# In a parameter expression, better
import re
idx = re.match(r".+(\d+)$", evaluatingParm().name()).group(1)

# Disable/Hide when syntax

{ enable# == 0 }


# In Type Properties / Edit Parameter Interface Defaults
# according to this excellent tip https://www.sidefx.com/forum/topic/23552/?page=1#post-153410
# not only can you use # in disable when/hide when expressions, but also parameter defaults!
# You could even just put "#" and it will evaluate it for you as if that were the default
# it only seems to work once though, so if you need multiple refs, store in a variable
# ie ch("parm_a#") + ch("parm_b#") will not work

i = #
return i + 123

very exciting