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Attention | Topic was automatically imported from the old Question2Answer platform. |
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Asked By | pferft |
Hi everyone,
there’s a random value created in a Sprite node’s script
rng.randomize()
var a_random_number = rng.randf_range(8, 18)
Now a parent wants to grab that value
var the_grabbed_random_value = $Sprite.a_random_number
but this thows the error
Invalid get index 'a_random_number' (on base: 'null instance').
How can I grab such a variable’s value from a child node?
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Reply From: | jgodfrey |
So, the issue here is that your $Sprite reference isn’t working - it’s null according to the error. What node is the above script associated with? For that $Sprite reference to be valid, you’d need a node named Sprite as an immediate child of the node associated with the above script. Apparently, that’s not the case here.
An immediate child, you say… it’s a grand-grand-child, so perhaps that’s the issue? For some reason I thought that any children down the branch would be “found automatically” in such a situation.
EDIT:
I think I know my mistake now: following the variable scope I shouldn’t put my var a_random_number into the func _ready(): (or any function really) because the value would be erased immediately after the reday-script finishes, thus leading to the null-instance. Putting the variable “on top of the script” should keep the value available.
pferft | 2022-10-29 09:49