c# - Object gets stuck when trying to bounce off screen edges, am I doing this wrong? -

public class asteroidmovement : monobehaviour {  public vector2 speed; public vector2 direction; private vector2 movement;  private vector3 topscreenbound; private vector3 bottomscreenbound;  // use initialization void start() {     topscreenbound = camera.main.viewporttoworldpoint(new vector3(0f, 1f, 0f));     bottomscreenbound = camera.main.viewporttoworldpoint(new vector3(0f, 0f, 0f)); }  // update called once per frame void update() {     if (gameobject.transform.position.y >= topscreenbound.y)     {         direction.y *= -1;     }      if (gameobject.transform.position.y <= bottomscreenbound.y)     {         direction.y *= -1;     }      movement = new vector2(speed.x * direction.x, speed.y * direction.y); }  void fixedupdate() {      rigidbody2d.velocity = movement; } } 

i trying have asteroids in game bounce off edge of screen , have got working decently, after few bounces, asteroid/object gets "stuck" in wall , glitches out playing area.

am going wrong? cannot see in code making asteroids stuck after couple of bounces.thanks in advance :)

you must fix object's position bounce inside screen, if object outside of screen , not enter in screen space in next frame, object changing it's direction infinitely until enters or leaves screen.

change this:

if (gameobject.transform.position.y >= topscreenbound.y) {     direction.y *= -1; }  if (gameobject.transform.position.y <= bottomscreenbound.y) {     direction.y *= -1; } 

to this:

if (gameobject.transform.position.y >= topscreenbound.y) {     gameobject.transform.position.y = topscreenbound.y;     direction.y *= -1; }  if (gameobject.transform.position.y <= bottomscreenbound.y) {     gameobject.transform.position.y = bottomscreenbound.y;     direction.y *= -1; }