How can I make the player pick up coins not initially there at runtime?

Help
1

Godot Version

4.3.stable

Question

So I have a very basic player script at the moment and coins I can spawn where I click. I’d like the player to be able to pick up these coins and increment a coin counter by a value depending on which coin they pick up.

From what I can guess, I need to use the on_body_entered signal somewhere and make something execute whenever the player passes through the coin body, but what I don’t understand is how to do this when the coin does not exist initially. Whenever I try to drop it into the coin script, the option to choose the player is not there, because it doesn’t know its going to be a sibling yet.

I’m sorry I’m very new to Godot, but here is my script for spawning the coins. The player script is just the default Characterbody2D script for now but I do plan to change that later.

extends Node2D

var copper_coin = preload(“res://copper_coin.tscn”)
var silver_coin = preload(“res://silver_coin.tscn”)
var gold_coin = preload(“res://gold_coin.tscn”)
@onready var character_body_2d = $CharacterBody2D

func _physics_process(delta):
if Input.is_action_just_pressed(“left_click”):
var value = randi_range(0,2)

  if value == 0:
  	inst_copper(get_global_mouse_position())
  if value == 1:
  	inst_silver(get_global_mouse_position())
  if value == 2:
  	inst_gold(get_global_mouse_position())

func inst_copper(pos):
var copper_coin_instance = copper_coin.instantiate()
copper_coin_instance.position = pos
copper_coin_instance.linear_velocity = Vector2(randf_range(-100,100),randf_range(-100,-200))
add_child(copper_coin_instance)

func inst_silver(pos):
var silver_coin_instance = silver_coin.instantiate()
silver_coin_instance.position = pos
silver_coin_instance.linear_velocity = Vector2(randf_range(-100,100),randf_range(-100,-200))
add_child(silver_coin_instance)

func inst_gold(pos):
var gold_coin_instance = gold_coin.instantiate()
gold_coin_instance.position = pos
gold_coin_instance.linear_velocity = Vector2(randf_range(-100,100),randf_range(-100,-200))
add_child(gold_coin_instance)

2

Do the coins have a Area2D? Connect the body_entered signal to the coin script itself, then use and if statement to detect only when it’s the player within the area, by name is a good option or by type

func _on_body_entered(body):
    if body.name == "Player":
        pass # collect coin
        self.queue_free()
3

I tried adding this to my coin script, but the player doesn’t seem to want to interact with the coin at all. I even included a line “print(body)” as a test and nothing shows up.

The coins are a RigidBody2D and the player is a CharacterBody2D. Maybe it has to do with having them on different collision layers? I had to put them on different layers because I wanted the coins to collide physically with my tilemaplayer but not the player. Perhaps there’s a better method to handling the coins with area2D?

4

Try an extra Area2D as part of the coin for just detecting the player. They look really good as RigidBodies

5

This seems to work thanks! I thought I might need some more optimized solution but even spawning hundreds of coins doesn’t seem to cause any lag so I won’t worry about it right now I guess. Thank you so much for your help!

6

Good collision masks will help reduce lag, you might just have a faster solution than RigidBodies alone!

7

The rigidbody is still there on top of the Area2D which is why I thought maybe it wasn’t the most optimal option. Would it be more optimal to maybe disable the rigidbody once the coin lands on the ground or is there some way I can just make the coin an Area2D instead of a rigidbody and prevent it from falling through the ground?

8

RigidBody is good, Godot automatically puts them to “Sleep” when a physics object hasn’t moved for a little over a second. As long as you haven’t disabled sleeping, the coins should be super performant when sleeping.

9

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