Collision with specific Nodes?

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1

Godot Version

Godot 4.1.1

Question

Collision with specific nodes?

Hello, I am new to Godot. I intended on making a momentum based platformer like Sonic but it quickly occurred to me I have no clue what I’m doing so I need to go way smaller.

So I decided to make Pong as a learning experience. I’ve managed to get the bats and balls working, it’s the score system I’m having trouble with.

I want to have the ball go off screen then one of the players gain score. Only issue is I don’t have the faintest clue how to code this. I have the score area for Player 2 in the game, issue is the ball just bounces back and doesn’t change the script.

Is there a way to have collision detection with a specific CollisionBody2D node? I’d love to learn how to implement this.

Thank you.

2

Oldschool pong only did collision between the ball and the paddles; the rest was determined by screen position. If the ball was going to go off the top or bottom of the screen they (IIRC) negated the Y component of the vector (so it would “bounce”), and if it was going off the left or right side of the screen the appropriate player gets a point.

Something like:

func ball_move():
    ball.position += ball_vector

    if ball.position.y < 0 || ball.position > SCREEN_Y:
        ball_vector.y = -ball_vector.y

    if ball.position.x < 0:
        player_1_score += 1
        new_serve()
    elif ball.position > SCREEN_X:
        player_1_score += 1
        new_serve()
3

If you want to do this with collision:

  • the layers let you decide what collides with what
  • you can have the different colliders call different handlers:
func entered_p1_score_area(_body):
    player[0].score()
    new_serve()

func entered_p2_score_area(_body):
    player[1].score()
    new_serve()

func wall_bounce(_body):
    ball.vector.y = -ball.vector.y