Not able to fire projectiles at mouse position

Question

Hey,

I'm trying to add a simple little system that shoots projectiles to the mouses location on click. I've it added and it's shooting projectiles like I want it to, just not at the right direction. It doesn't matter where my mouse is, if my character is on the right side of the scene, the projectiles will shoot left and if it's on the left side, you guessed it - projectiles will fire away to the right.

Any idea what could be causing t$$anonymous$$s? Here's the relevant function.

  void Shoot () {
          if (Input.GetMouseButtonDown(0)) {
          Vector2 mousePos = new Vector2 (Camera.main.ScreenToWorldPoint(Input.mousePosition).x, Camera.main.ScreenToWorldPoint(Input.mousePosition).y);
          Vector2 myPos = new Vector2(transform.position.x,transform.position.y);
          Vector2 direction = mousePos - myPos;
          direction.Normalize();
          Quaternion rotation = Quaternion.Euler( 0, 0, Mathf.Atan2 ( direction.y, direction.x ) * Mathf.Rad2Deg);
          GameObject projectile = (GameObject)Instantiate( projectilePrefab, firePoint.position, rotation);
          projectile.GetComponent<Rigidbody2D>().velocity = direction * speed;
         }
     }

Answer 1

Answer by cezikmertcan · Sep 02, 2016 at 11:45 PM

Try t$$anonymous$$s

   void Shoot ()
   {
     if (Input.GetMouseButtonDown(0))
     {
           Vector2 mousePos = Camera.main.ScreenToWorldPoint(Input.mousePosition);
           Vector2 myPos = (Vector2)transform.position;
           Vector2 direction = mousePos - myPos;
           direction.Normalize();
           float angle =  Mathf.Atan2 ( direction.y, direction.x ) * Mathf.Rad2Deg;
           GameObject projectile = (GameObject)Instantiate( projectilePrefab);
           projectile.transform.position = firePoint.position;
           projectile.transform.Rotate (0, angle, 0);
           projectile.GetComponent<Rigidbody2D>().velocity = direction * speed;
     }
 }

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Temseii · Sep 03, 2016 at 12:32 AM 0

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Thanks for the reply! The issue didn't change though.. Tried so many things, it's starting to feel like it's something in the settings and not in the script

cezikmertcan Temseii · Sep 03, 2016 at 12:18 PM 0

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I will try my code and do a better version to post here. Sorry did not have a chance to try this one.

Answer 2

Answer by josehzz112 · Sep 03, 2016 at 04:50 PM

I t$$anonymous$$nk I have a better solution

Declare public float angleOffsetInDegrees, change it in the inspector to get the desired rotation in degrees.

 void Shoot() {
     if (Input.GetMouseButtonDown(0)) {
         Vector2 mousePos = Camera.main.ScreenToWorldPoint(Input.mousePosition); //Mouse position to world position
         Vector2 myPos = new Vector2(transform.position.x, transform.position.y);
   
         //Calculate direction in quaternion
         Quaternion targetQuaternion = Quaternion.Euler(Quaternion.LookRotation(Vector3.forward, mousePos - myPos).eulerAngles + new Vector3(0f, 0f, angleOffsetInDegrees));
   
         //Calculate direction in Vec3
         Vector3 direction = new Vector3(Mathf.Sin(-targetQuaternion.eulerAngles.z * Mathf.Deg2Rad), Mathf.Cos(targetQuaternion.eulerAngles.z * Mathf.Deg2Rad), 0f);
         direction.Normalize();
   
         //Instantiate
         GameObject projectile = (GameObject)Instantiate(projectilePrefab, firePoint.position, targetQuaternion);
         projectile.GetComponent<Rigidbody2D>().velocity = direction * speed;
     }
 }

First I calculate the Quaternion setting the foward vector as the pivot for the rotation, and then the Vector3 using the Sin and Cos functions to get the corresponding angle.

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Temseii · Sep 03, 2016 at 08:48 PM 0

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Appreciate the post! That changed thing up a little bit, the projectile is now going directly north no matter where I keep my mouse

josehzz112 · Sep 04, 2016 at 03:58 AM 0

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I fixed the code in my answer.

Hope it works now.

Temseii josehzz112 · Sep 04, 2016 at 04:10 AM 0

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That took it back to the original issue, where if I'm standing on the left side of the screen the projectiles will fire right and vise versa. :/

josehzz112 Temseii · Sep 04, 2016 at 04:15 PM 0

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Updated the code. Now you can add an offset angle value to the calculated one. Change the value of that variable in the inspector from 0 to 360 and test it to get the desired rotation angle.

Not able to fire projectiles at mouse position

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