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Asked By | JJHaggar |
Hello,
I am new to Godot, and I am trying to make a 2d top-down shooter (a simple Asteroids clone) to learn a bit about Godot basics, but I encountered a ‘strange’ behaviour when I added bullets, you can watch it here: https://youtu.be/2Ywcl4VGeNY?t=4s (they are slow bullets but the problem is not that, the problem it’s that they collide & push the ship and the other bullets, and I’d like to overwrite that behaviour somehow)
The project is here in case you want to take a look (this is the folder of the Asteroids clone, the rest of the project is a bit messy, sorry) Bitbucket
The ship is a KinematicBody2D, and the bullets are also KinematicBody2D, and I don’t know if it’s normal that when they collide they automatically push each other as you can see on the video.
Can I control what happens when 2 KinematicBody2D meet each other? (for example go through each other? bounce?) Or maye I should be using area2D instead? (is what I can extract more or less after reading the docs Physics introduction — Godot Engine (latest) documentation in English but I’m not sure at all)
SpaceShip code:
extends KinematicBody2D
const ACCELERATION = 2
const ROTATION_ACCELERATION = 5
const MAX_SPEED = 100
var motion = Vector2()
var rotation_deg = 0
const SCREEN_WIDTH = 480
const SCREEN_HEIGHT = 270
func _input(event):
if event.is_action_pressed("fire"):
$BulletSpawn.fire(rotation_deg)
return
func _process(delta):
$"../DebugLabel".text = "angle=" + str(rotation_deg) + "\n" + \
"sin=" + str(sin(deg2rad(rotation_deg))) + "\n" + \
"cos=" + str(cos(deg2rad(rotation_deg))) + "\n" + \
"motion=" + str(motion) + "\n" + \
"pos=" + str(position) + "\n" + \
"sin=" + str(sin(deg2rad(rotation_deg)))
func _physics_process(delta):
if Input.is_action_pressed("ui_left"):
rotation_deg -= ROTATION_ACCELERATION
if Input.is_action_pressed("ui_right"):
rotation_deg += ROTATION_ACCELERATION
rotation = deg2rad(rotation_deg)
if Input.is_action_pressed("ui_up"):
motion.x += ACCELERATION * cos(deg2rad(rotation_deg))
motion.y += ACCELERATION * sin(deg2rad(rotation_deg))
if Input.is_action_pressed("ui_down"):
motion.x -= ACCELERATION * cos(deg2rad(rotation_deg))
motion.y -= ACCELERATION * sin(deg2rad(rotation_deg))
move_and_slide(motion)
if position.x > SCREEN_WIDTH:
position.x = 0
if position.y > SCREEN_HEIGHT:
position.y = 0
if position.x < 0:
position.x = SCREEN_WIDTH
if position.y < 0:
position.y = SCREEN_HEIGHT
if motion.x > MAX_SPEED:
motion.x = MAX_SPEED
if motion.y > MAX_SPEED:
motion.y = MAX_SPEED
if motion.x < -MAX_SPEED:
motion.x = -MAX_SPEED
if motion.y < -MAX_SPEED:
motion.y = -MAX_SPEED
if rotation_deg > 360:
rotation_deg = -360
if rotation_deg < -360:
rotation_deg = 360
Bullet code:
extends KinematicBody2D
var angle = 0.0
const SPEED = 50
var motion = Vector2()
func _ready():
set_as_toplevel(true)
pass
func _physics_process(delta):
motion.x = SPEED * cos(deg2rad(angle))
motion.y = SPEED * sin(deg2rad(angle))
move_and_slide(motion)
BulletSpawn code:
extends Node2D
var bullet = preload("Bullet.tscn")
func fire(angle):
var new_bullet = bullet.instance()
new_bullet.angle = angle
new_bullet.position = get_parent().position
get_parent().get_parent().add_child(new_bullet)
I’ve been searching info and trying to figure out which approach would be best but I fear I’ve still got poor programming skills so I feel a bit overwhelmed.
Info/Things I tried:
Godot 3.0: Using KinematicBody2D · KCC Blog I Downloaded the example to test but I cannot get the same results by myself :S
https://forum.godotengine.org/3247/i-need-help-about-collision-and-area2d Outdated (it’s for godot 2)
Reddit - Dive into anything
https://forum.godotengine.org/12942/best-node-for-a-bullet?
I hope somebody can point me in the correct direction. Thank you for your help! 
