My Ray is going the wrong way

Questions & Answers
1

i have a top down view game, where you can move arounds with w,a,s,d and you make the character look around with the mouse(the camera is stationary), i wanted to shoot a ray to collide with the terrain, to then create a point so i can calculate my characters rotation. When i draw the ray in the debug mode, it just shoots backwards from the camera. How do i make it shoot to the ground?

    #pragma strict
    
    var Cam : Transform;
    
    function Update()
    {
Debug.DrawRay (Cam.position, Input.mousePosition, Color.green);
    }
2

You will have to use Camera.ScreenToWorldPoint as Input.mousePosition contains the mouse position in screen space which you will need to convert to world sppace. You will have to note that the z component of the parameter vector in the ScreenToWorldPoint method contains the distance at which the point should be from the camera. So for example if your camera’s z position is at -10 and your world is at z 0, the z component of the vector you pass to the method has to be 10.