Why can't I instance the node(s)?

Question

I tried multiple ways of declaring the 'i' or '_i' but it just isn't working

Answer 1

get_children() returns an array of the child nodes, not an integer.

I believe you can just do this:

for child in lines.get_children():
        ray_col_check(child)

If you for some reason need an integer, use get_child_count() instead

for i in lines.get_child_count():
    ray_col_check(lines.get_child(i))