Shoot towards mouse in Unity2D

Question

I've been having trouble figuring out how to shoot a projectile in constant speed from the location of my character to the mouse position, and let it continue after reaching the mouse position, all while ignoring gravity, as in, a straight line.

I've managed to make the projectile be at the right angle, but couldn't make it travel towards, and through, the mouse.

Answer 1

Answer by Omberone · Jun 27, 2014 at 10:50 PM

 Vector2 direction = target - myPos;
 direction.Normalize();
 GameObject projectile = (GameObject)Instantiate( projectilePrefab, myPos, Quaternion.identity);
 projectile.rigidbody2D.velocity = direction * speed;

if you want to get the mouse cursor's position in world coordinates all you have to do is

 Vector2 cursorInWorldPos = Camera.main.ScreenToWorldPoint( Input.mousePosition );

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SgtPancakes · Jun 28, 2014 at 12:18 AM 0

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It doesnt appear to work, the bullets just kind of fall with slight movement towards the clicking position.

This is my code: public class Shooting : $$anonymous$$onoBehaviour {

     public GameObject bullet;
     public float speed = 5.0f;
 
     // Use this for initialization
     void Start () {
     
     }
     
     void Update () {
         if (Input.Get$$anonymous$$ouseButtonDown(0)) {
             Vector2 target = Camera.main.ScreenToWorldPoint( new Vector2(Input.mousePosition.x, Screen.height - Input.mousePosition.y) );
             Vector2 myPos = new Vector2(transform.position.x,transform.position.y + 1);
             Vector2 direction = target - myPos;
             direction.Normalize();
             GameObject projectile = (GameObject)Instantiate( bullet, myPos, Quaternion.identity);
             projectile.rigidbody2D.velocity = direction * speed;
         }
     }
 }

EDIT: never $$anonymous$$d, i just forgot to change the bullet's mass and gravity.

But there is another problem, the bullet doesnt rotate towards its flight direction, how to i fix that?

Omberone · Jun 28, 2014 at 12:24 PM 1

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Quaternion rotation = Quaternion.Euler( 0, 0, $$anonymous$$athf.Atan2 ( direction.y, direction.x ) * $$anonymous$$athf.Rad2Deg );

SgtPancakes · Jun 28, 2014 at 02:47 PM 1

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Well, it sort of worked, it now faces its direction with its body, rather than its tip. Its like the bullet hits the target with its broad side rather than its head, if that sort of makes sense.

this is my implementation:

 if (Input.Get$$anonymous$$ouseButtonDown(0)) {
             Vector2 target = Camera.main.ScreenToWorldPoint( new Vector2(Input.mousePosition.x,  Input.mousePosition.y) );
             Vector2 myPos = new Vector2(transform.position.x,transform.position.y + 1);
             Vector2 direction = target - myPos;
             direction.Normalize();
             Quaternion rotation = Quaternion.Euler( 0, 0, $$anonymous$$athf.Atan2 ( direction.y, direction.x ) * $$anonymous$$athf.Rad2Deg );
             GameObject projectile = (GameObject) Instantiate( bullet, myPos, rotation);
             projectile.rigidbody2D.velocity = direction * speed;
         }

SudoPhalanx SgtPancakes · Jul 29, 2017 at 04:14 AM 0

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Hey I used this code and it works great, but the bullet starts in the middle of my player. How do I get it to start at the tip of the player?

FunkyPhoenixGames SgtPancakes · Apr 08, 2018 at 07:06 PM 0

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Thanks, this code really helped a lot =).

Omberone · Jun 28, 2014 at 03:58 PM 0

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that depends on where your bullet is facing in the prefab =) Is the tip pointing up, right, left or down?

SgtPancakes · Jun 28, 2014 at 05:22 PM 1

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In the prefab it's facing up. Edit: got it! :D

 Quaternion rotation = Quaternion.Euler( 0, 0, $$anonymous$$athf.Atan2 ( direction.y, direction.x ) * $$anonymous$$athf.Rad2Deg + 90 );

Answer 2

Answer by BenBL · Oct 13, 2017 at 03:06 PM

Anyone can explain Why we had to +1 in position.y? Thanks.

Vector2 myPos = new Vector2(transform.position.x,transform.position.y + 1);

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FunkyPhoenixGames · Apr 08, 2018 at 07:05 PM 0

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It may have had something to do with the size and/or shape of the character SgtPancakes was using; you can safely remove it if it is annoying though =).

@BenBL

Shoot towards mouse in Unity2D

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