Camp
is this running in physics_process? because that's the only place were you can interact with physics.
interact_areas I think is okay, then you iterate through it.
for i in interact_areas:
what this does is iterate through the array and assign the current item to i, so you can run code on every item of the array
var interact_area = interact_areas[i]
this part is pointless, redundant, as i already contains what you want interact_area to be.
you should also check if arrays contain items with:
if not my_array.is_empty():
and check if each item is valid, to prevent errors.
