How to make a kinematic body bounce back when it hits another kinematic or static body?

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:bust_in_silhouette: Asked By CynicalKazu

I am basically making pong. The ball doesn’t bounce back after hitting the paddles or the level bounds when I use move_and_slide(). I am a beginner so someone please help. lol

:bust_in_silhouette: Reply From: newold

i use to move the ball a direction (vector2()) and a speed (int or float), then in my process i get the velocity thus:

func _process(delta: float) -> void:

   # Get velocity
   var velocity = speed * delta * direction # move slow? increases speed or multiply this x 100
   # move and slide:
   # check if there is a collision:
   if get_slide_count() > 0:
      var collision = get_slide_collision(0)
      if collision != null:
         direction = direction.bounce(collision.normal) # do ball bounce

You can create your variable direction with random values for x and y from values -1 to 1. then when ball get a collision, it bounce in right direction

var direction = Vector2()
var speed = 500

    func _ready():
       # start with random direction beetween -1 and 1
       direction.x = rand_range(-1, 1)
       direction.y = rand_range(-1, 1)