bouncing ball

Unity Engine
1

Hi there guys

I need some help creating a bounce effect between 4 walls with no gravity. I have a 2d app, where the z-axis is always 0. unfortunitely I cant have rigidbodies, since my particles are going to react slightly different than normal physics behaviour. Anyway, so my question is this: If I have a box called “wall” and a sphere called “ball”, with all colliders set up, what would the code be to let the ball bounce with the correct angle from the wall (kinda like a typical flash ball bouncing between 4 walls)?

I hope this make sense…Thanks in advance

2

Hmm… Well you could have the ball moving forward using transform.Translate(Vector3.forward) then when it hits a wall, take the balls current rotation, subtract it from 360 and re-rotate and then have it move forward again, something like this. Now mind you that I’m really tired and this code isn’t tested.

var speed : float;
var rotating : boolean;

function Update(){
if(!rotation){
transform.Translate(Vector3.forward * Time.deltaTime * Speed);
}
}

function OnCollisionEnter(hit : Collision){
if(hit.gameObject.tag == "Wall"){
if(!rotating){
rotating = true;
transform.rotation.y = 360 - transform.rotation.y;
rotating = false;
}
}
}
3

Thanks Astrauk

I like your way and I think it might be better for my application. for what it’s worth, I have also tried this, which works really well and fast, but I don’t know how to calculate x and y when 2 balls collide with each other:

speedConstant = Time.deltaTime;
        if (transform.position.y > 9 || transform.position.y < -9)
        {
            speedY *= -1;
        }
        else if (transform.position.x > 9 || transform.position.x < -9)
        {
            speedX *= -1;
        }