Godot doesn't trigger collision

Question

I'm using godot 4.2.1 and try to orient this tutorial series in my first test project.

I made a map and common enemy which is inherited form base enemy and walks on a path. Also I made a TowerMk1 inherited from base tower. Now I want this tower to rotate and track enemies in it's range.

My problem is that body_entered signal of tower's Area2D doesn't trigger.

My BaseEnemy:

My CommonEnemy (pink rectangle - CollisionShape2D):

BaseTower:

TowerMk1 (blue circle - CollisionShape2D):

body_entered is connected in BaseTower in the editor - proof:

In TowerMk1 it's connected automatically because of an inheritance.

BaseTower script:

extends Node2D

@export var enemy_tracking : bool = true

var enemies = []

func _physics_process(delta):
    if enemy_tracking:
        track_enemy()
    else:
        pass

func track_enemy():
    var target = select_enemy()
    if not target == null:
        turn_to(target)

func select_enemy():
    var max_progress = -1
    var target
    var current_progress
    for enemy in enemies:
        current_progress = enemy.get_progress()
        if current_progress > max_progress:
            target = enemy
            max_progress = current_progress
        
    return target

func turn_to(target):
    get_node("TowerSprite").look_at(target.position)

func _on_range_body_entered(body):
    if body is BaseEnemy:
        enemies.append(body.get_parrent())


func _on_range_body_exited(body):
    if body is BaseEnemy:
        enemies.erase(body.get_parrent())

I put a debugger stop flag on this row:

But it is not triggered at all!

I marked a checkbox to show collision shapes during a debug and this is how it looks:

You can see that the pink rectangle is inside the blue circle (it was not spawned right here - they traveled from the beginning of the path). But the collision was not triggered.

Collision of both Range of the tower and AnimatebleBody2D of the enemy match in their parameters: Layer 1, Mask 1.

What do I do wrong?

Bugfish · Accepted Answer · 2024-04-12 09:06:11Z

2

The problem is the AnimatableBody2D, which is basically a StaticBody2D.

Referencing to this ticket in github

When StaticBody2D is moved, it is teleported to its new position without affecting other physics bodies in its path.

This is also true for AnimatableBody2D.

You could switch to an CharacterBody2D to make it work, or disable sync_to_physics in the AnimatableBody2D. Both will allow the area to detect your enemy.

Sidenode:

if body is BaseEnemy:

will not work, cause your AnimatableBody is not holding your script. Instead use:

if body.get_parent() is BaseEnemy:

answered Apr 12, 2024 at 9:06

Bugfish

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2 Comments

Stakan Stakan Over a year ago

Thanks for the answer. But I'm confused with "When moved manually, it affects other bodies in its path." in the description of AnimatableBody2D.

Bugfish Over a year ago

I think the problem is, that you are not directly moving the Body, but its parent. So the position of AnimatableBody2D actually does not change. I tried moving the Body directly be changing its position, which results in the area detecting the body. So I guess since the linear and angular velocity are estimated, it uses the bodys position for calculations. Since we move the PathFollow2D instead, the body is "porting" not moving into the area

Procrastinator · Accepted Answer · 2024-06-13 06:27:45Z

-1

func _on_range_body_entered(body):
    if body is BaseEnemy:
        enemies.append(body)

func _on_range_body_exited(body):
    if body is BaseEnemy:
        enemies.erase(body)

edited Jun 13, 2024 at 6:27

Procrastinator

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answered Jun 11, 2024 at 16:25

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