Shooting to the center of the screen.

Unity Engine
1

Hi,

This code is used to fire laser straight forward.

using UnityEngine;
using System.Collections;

public class LeftGun : MonoBehaviour {

    public Rigidbody laser;
    public AudioClip LaserShot;

    float shotSpeed = 0.1f;
    bool canShoot = true;

    // Update is called once per frame
    void Update () {

        if(!Engine.escape)
        {
            shotSpeed -= Time.deltaTime;

            if(shotSpeed <= 0f)
                canShoot = true;

            if(Input.GetButton("Fire1") && canShoot)
            {
                shotSpeed = 0.1f;
                canShoot = false;
                PlayerGUI.ammunition--;
                audio.PlayOneShot(LaserShot);
                Rigidbody clone = Instantiate(laser,transform.position, transform.rotation) as Rigidbody;
                clone.velocity = transform.TransformDirection(-80, 0, 0);
                Destroy(clone.gameObject, 3);
            }
        }
    }

I would like to fire to the center of the screen (where crosshair is). How can I achive that?

2

So, you want to fire a laser on a 2D plane toward a crosshair that is always located at the center of the screen. Is that correct?

3

Something like this:

682×592 200 KB

4

I’d do something like this:

//
// Screen space (viewport) coordinates are between 0..1 so 0.5 on both the x and y is
// the screen centre.
//
Vector3 screenSpaceCenter = new Vector3(0.5f, 0.5f, 0);
//
// Convert that to a world point where myCamera needs to be changed to be
// your actual camera.
//
Vector3 laserEnd = myCamera.ViewportToWorldPoint(screenSpaceCenter);

//
// Shoot towards laserEnd
//
2 Likes
5

That solution will be adequate if the projectiles always go to the center of the screen and the spaceship doesn’t move. If it does move and the lasers go to a point in front of it rather than a static position at the center of the screen that solution will not work.

6

Yeah… It’s not working. Like outwarddesign said, spaceship is moving and it’s not working.

@
Solved.

public Camera myCamera;

float x = Screen.width / 2;
float y = Screen.height / 2;
              
var ray = myCamera.ScreenPointToRay(new Vector3(x, y, 0));
clone.velocity = ray.direction * 80;
2 Likes
7

Looks good. Good job!

8

thanks worked

9

thx it worked thx soooooo much