Shooting a projectile from player towards mouse ( problem with camera )

Hello

I have seen several post on the same topic ( shot towards mouse), but I could not find any where problems were related to the camera position, so here I am.

Problem:
When the player object is in the center of the world, the projectile is 5-10 degrees off target. But once i start moving around the difference increases up to 180 degrees.
My "Main Camera" is attached to the player object, following it around. The camere is placed at [0, 10, -15] when the player object is at [0, 0, 0] with a 30 degree angle down towards the player object.

This is the code that sends the projectile towards the mouse:

Code (csharp):

1.  
2. public class Projectile : MonoBehaviour {
3.  
4.     public float speed;
5.     public Vector3 mousePos;
6.     private Rigidbody rb;
7.  
8.     private Plane zeroYPlane;
9.  
10.  
11.     void Start(){
12.         rb = GetComponent<Rigidbody> ();
13.    
14.         zeroYPlane = new Plane (Vector3.up, Vector3.zero);
15.  
16.         Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
17.         float _hitDistance;
18.         zeroYPlane.Raycast (ray, out _hitDistance);
19.         mousePos = ray.GetPoint (_hitDistance);
20.         mousePos = new Vector3 (mousePos.x, 0, mousePos.z);
21.         mousePos.Normalize ();
22.         rb.velocity = mousePos * speed;
23.  
24.     }
25. }
26.  

Any help will be greatly appreciated.

Please note that my coding knowledge is rather limited, so please try to keep it simple.

 

I've been fumbling around trying to figure out the problem related to moving the player object(and the main camera).
I figured out the cause, but I have no idea on how to fix it.
It appears that the "Camera.main.ScreenPointToRay(Input.mousePosition);" line does not update when I move the camera.
In order to fix this, do I have to attack the actual "Main Camera" as a Camera object to the script?

 

Put it into the update function. The start function gets called once, update is called on every frame.

 

This does not work either, the only result I get is that the projectiles always moves towards the mouse pointer. This did not solve the problem with the camera.

 

Woop I fixed the main issue. In order to fix the issue with the projectile suddenly being 180 degrees of target I had to add this:

Code (csharp):

1.  
2. mousePos = new Vector3 (mousePos.x - transform.position.x, 0, mousePos.z - transform.position.z);
3.  

The projectile is still slightly of target, by about 5 degrees at most, any ideas on how to fix that?