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Question by Alextrew · Feb 19, 2014 at 04:54 PM · mouserotatenullreferenceexceptionrotate object

rotate object to face mouse cursor x/z top down shooter

I have this script, but I keep getting a null reference exception, and I have no idea what to do

 // LookAtMouse will cause an object to rotate toward the cursor, along the y axis.
 //
 // To use, drop on an object that should always look toward the mouse cursor.
 // Change the speed value to alter how quickly the object rotates toward the mouse.
  
 // speed is the rate at which the object will rotate
 var speed = 5;
  
 function Update () {
     // Generate a plane that intersects the transform's position with an upwards normal.
     var playerPlane = new Plane(Vector3.up, transform.position);
  
     // Generate a ray from the cursor position
     var ray = Camera.main.ScreenPointToRay (Input.mousePosition);
  
     // Determine the point where the cursor ray intersects the plane.
     // This will be the point that the object must look towards to be looking at the mouse.
     // Raycasting to a Plane object only gives us a distance, so we'll have to take the distance,
     //   then find the point along that ray that meets that distance.  This will be the point
     //   to look at.
     var hitdist = 0.0;
     // If the ray is parallel to the plane, Raycast will return false.
     if (playerPlane.Raycast (ray, hitdist)) {
         // Get the point along the ray that hits the calculated distance.
         var targetPoint = ray.GetPoint(hitdist);
  
         // Determine the target rotation.  This is the rotation if the transform looks at the target point.
         var targetRotation = Quaternion.LookRotation(targetPoint - transform.position);
  
         // Smoothly rotate towards the target point.
       transform.rotation = Quaternion.Slerp(transform.rotation, targetRotation, speed * Time.deltaTime); // WITH SPEED
         //transform.rotation = Quaternion.Slerp(transform.rotation, targetRotation, 1); // WITHOUT SPEED!!!
     }
 }
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