Bullet bounce issue using Vector3.reflect

Question

Hello ,i have gone throught tons of other questions and posts but none of them have helped me figure out a solution for my problem. I apologies for the poor terminology but im fairly new to unity .

The set up of this game is 2D , with camera rotation 0,0,0 . I have made a gun object that is pointing with its ,,green arrow'' towards the mouse point. Then i made it shoot/instantiate bullets , and i made the bullets bounce of the walls using the Vector3.reflect , but i can only get the bullets to bounce properly when they are moving ,,right '' towards Vector3.right . So whenever i instantiate them they are bouncing the way i wanted but instead of starting off towards the mouse point they move 90 degrees to the side towards the ,,red arrow ''

So there are 2 things i've been trying to do:

Either instantiate the bullets with 90 degrees offset on their Z axis ... Or Edit the reflect angle code to work going ,, up '' instead of ,, right '' , but i cant get any of that to work .

Here is the C# scripts that i use for the "gun" object:

Vector3 mousePos = Camera.main.ScreenToWorldPoint(Input.mousePosition);

transform.rotation = Quaternion.LookRotation(Vector3.forward, mousePos - transform.position);

 if (Input.GetButtonDown ("Fire1") ) {                                    
         Instantiate(Ball, transform.position , transform.rotation) ;}

And this is the script attached to the ball :

     transform.Translate (Vector3.right * Time.deltaTime * speed);

     Ray ray = new Ray (transform.position, transform.right);
     RaycastHit hit; 
     
 if (Physics.Raycast (ray, out hit, Time.deltaTime * speed + 0.1f, collisionMask)) {
         Vector3 Dir = Vector3.Reflect (ray.direction, hit.normal);
         float rot =    Mathf.Atan2(Dir.y , Dir.x ) * Mathf.Rad2Deg ;
         transform.eulerAngles = new Vector3(0, 0,rot ) ;

I will appreciate any help or advice with this issue as im trying to work it out for the past 4 weeks and its just driving me creazy . Thanks.

Answer 1

Answer by studentutu · Feb 22, 2019 at 02:08 PM

@Neralm, If you have Physics material applied to that Bullet (Physically Accurate bullet are not 100% elastic - Bounce value inside Physics Material) you need to change the normal in the hitting surface - (multiple by Bounce value, this is exactly what physics engine doing behind each collision).

Something like this : if (Physics.Raycast(lastLaserPosition, laserDirection, out hit, laserDistance, mask) && hit.transform.gameObject.layer == GameLayer.BORDER_ID) { vertexCounter += 1; distanceToCollider = Vector3.Distance(lastLaserPosition, hit.point); laserPositions.Add(hit.point); lastLaserPosition = hit.point; laserDirection = Vector3.Reflect(laserDirection, hit.normal * bounciness); laserDistance -= distanceToCollider; }

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Bullet bounce issue using Vector3.reflect

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