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Question by thebeluvdtrex · Apr 27, 2017 at 06:13 AM · 2d rotation

How do you instantiate an object at the tip of a rotating object?

So basically I'm trying to make a simple space shooter similar to asteroids. All I want to do is instantiate the bullet at the end of the ship so it shoots our the tip but for some reason the code I implemented wont work as the bullet still shooting from the center of the ship which makes it look awkward in essence.

Movement Code

 Rigidbody2D body;

 float maxSpeed = 300f;

 void Start(){

     body = GetComponent<Rigidbody2D> ();

 }

 void FixedUpdate(){

     if (body.velocity.magnitude > maxSpeed) {

         body.velocity = body.velocity.normalized * maxSpeed;

     }

 }

 void Update () {

     Quaternion rot = transform.rotation;

     float z = rot.eulerAngles.z;

     if(Input.GetKey(KeyCode.A)){
         z += maxSpeed / 100;
     }

     if(Input.GetKey(KeyCode.D)){
         z -= maxSpeed / 100;
     }

     rot = Quaternion.Euler (0, 0, z);

     transform.rotation = rot;

     if (Input.GetKey (KeyCode.W)) {
         body.AddForce (transform.up * .03f);
     }

 }

Shooting Code

     public Vector3 bulletOffset = new Vector3(0, 3f, 0);
 
     public GameObject projectile;
 
     void Update () {
 
         Vector3 offset = transform.rotation * bulletOffset;
 
         if (Input.GetKeyDown (KeyCode.Space)) {
 
             Instantiate (projectile, transform.position + offset, transform.rotation);
 
         }
     
     }

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Answer by BackslashOllie · Apr 27, 2017 at 10:34 AM

Personally, I would add a child GameObject to your ship, place it at where you would like the bullets to fire from and then reference it's Transform in your shooting code.

For example

     public Transform shootingPoint; //Set this to child object in inspector

     void Update () {
 
         if (Input.GetKeyDown (KeyCode.Space))
             Instantiate (projectile, 
                          shootingPoint.position, 
                          shootingPoint.rotation);
     }
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avatar image thebeluvdtrex · Apr 28, 2017 at 02:56 AM 0
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This is a very simple work around and works like a charm. THAN$$anonymous$$ YOU!

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