How to get a LineRenderer to shoot from Gun Point to Mouse Position

So i created a LineRenderer to be used a a Laser Gun, it worked fine when I wanted it to shoot from the Gun Position forward but Now that I’m trying to make it go towards the Mouse it mainly just shoots upwards or in a random location. Here is my code so far.

if(Input.GetMouseButtonDown(0)){ 


var start = transform.position;
laser.SetPosition(0,start);
var location = Input.mousePosition;
var finish = start + location * 10;
var ray : RaycastHit;


if(Input.GetButton("Fire1") && Physics.Raycast (location, start, ray)) 

finish = ray.point;

laser.SetPosition(1,finish);

Any help is much appreciated.

You need to do some research into how Raycast are done. You either cast a ray, or you can cast from a world position and direction. Your Raycast() is using a screen location for the position and a world position for the direction. The typical code would look like this:

var ray : Ray = Camera.main.ScreenPointToRay(Input.mousePosition);
var hit : RaycastHit;

if(Input.GetButton("Fire1") && Physics.Raycast (ray, hit)) { 

    laser.SetPosition(1,hit.point);
}

Note this is using the ‘ray’ version of Raycast().