this post was submitted on 06 Apr 2025
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[Solved] Help. Need help with adding Area2D to groups dynamically (lemmy.world)
submitted 2 weeks ago* (last edited 2 weeks ago) by BilliamBoberts@lemmy.world to c/godot@programming.dev
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I have instances of this area2d object that spawns and is added to a group dynamically. when they collide I want them to say their name and the group they are in. right now they report their name but not their group and I can't figure out why, when they instantiate they report the group they are in so it looks like they're in their group but when they collide the group is missing.

var type_groups = [ "pluto", "moon", "mercury", "mars", "venus", "earth", "neptune", "uranus", "saturn", "jupiter", "sun" ]

func set_type(t): type = t

# Adjust for paths or hierarchy
var shape = get_node_or_null("CollisionShape2D")
if shape:
	shape.scale = Vector2(type_sizes[t] * 5.5, type_sizes[t] * 5.5)
	
var detect = get_node_or_null("Area2D/CollisionDetection")
if detect:
	detect.scale = Vector2(type_sizes[t] * 5.7, type_sizes[t] * 5.7)
	detect.add_to_group(type_groups[t])
	print("added to group: ", type_groups[t])
	
var sprite = get_node_or_null("Sprite2D")
if sprite:
	sprite.scale = Vector2(type_sizes[t] * 1, type_sizes[t] * 1)
	sprite.texture = type_textures[t]

func _on_area_2d_area_entered(area): print("Collision detected by: ", get_name(), " | group: ", area.get_groups()) set_contact_monitor(true)

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[–] je_skirata 2 points 2 weeks ago

You can use str() to print the array of groups as-is, or use other functions to parse the data from the array. Also, prints() is the right function to use for comma-separated print values.

Godot docs for str()

Godot Docs for prints()

Possible quick-and-dirty fix:

func _on_area_2d_area_entered(area):
 prints("Collision detected by:", get_name(), "| group:", str(area.get_groups()) )

This might help too:

func _on_area_2d_area_entered(area):
# Information about the detected area
var area_name: String = area.name
var area_groups: Array[StringName] = area.get_groups()

# Check with type_groups[] array defined earlier; probably redundant step
for checked_group in type_groups:
  if checked_group in area_groups:
   prints("Collision detected by:", self.get_name(), "| detected area:", area_name, "| group:", checked_group)

If there's problems with collison detection make sure both areas have the same layer/mask. Remember the docs are your friend.