Shooting at mouse position

Question

Hi guys I need some help with my code, it's a simple 2d shooter, I want the player to shoot in the direction the mouse is pointing, this is my code:

  if(Input.GetButtonDown("Fire1")){
             var mouse = Input.mousePosition;
             mouse.z = 1.0; //diobonino
             var mouseworldpos : Vector3 = Camera.main.ScreenToWorldPoint(mouse);
             mouseworldpos.y = transform.position.y;
             Debug.Log(mouseworldpos);
             var bullet_dir : Vector3 = mouseworldpos - transform.position;
             bullet_dir = bullet_dir.normalized;
             var clone = Instantiate(bullet1,transform.position + bullet_dir * 2,Quaternion.LookRotation(mouseworldpos, Vector3.forward));
             clone.GetComponent(Rigidbody).AddForce(bullet_dir * bullet_speed);
         }

My first problem is that sometimes it shoots in the direction of the old mouseposition, especially when the player is moving. My secondo problem is the rigidbody, is there another way to shoot bullets that can detect collision without using rigidbody?

Thanks everybody

Answer 1

Answering second problem here...

If you don't need to simulate bullets in real time then you could simply use RayCasting to get the behavior for a shooter. All you would need in this case would be a collider component (like box/mesh colliders).

Try the following script. Add it to any GameObject, like the main camera. Then create a cube and place it somewhere where your camera can view it. Separate your scene and game views so that you can view both simultaneously and hit play. Left-Click around the game window and you'll see a red line is drawn on the scene view. Any time you click on an object with a collider you'll see a debug message come up with the name of the GameObject you hit. Let me know if this would work for what you want to do and I can help you customize it further.

 using UnityEngine;
 using System.Collections;
 
 public class Shooter : MonoBehaviour
 {
     private Ray ray;
     private RaycastHit hit;
     // Use this for initialization
     void Start ()
     {
     
     }
     
     // Update is called once per frame
     void Update ()
     {
         if (Input.GetKeyDown(KeyCode.Mouse0))
         {
             ray = Camera.main.ScreenPointToRay(Input.mousePosition);
 
             if (Physics.Raycast(ray, out hit, 25.0f))
             {
                 Debug.Log(string.Format("Hit: {0}!", hit.transform.gameObject.name));
             }
             else
             {
                 Debug.Log("Missed!");
             }
         }
 
         Debug.DrawLine(ray.origin, ray.direction * 25.0f, Color.red);
     }
 }

Shooting at mouse position

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