Get nearest object by using raycast

Question

well I'm trying to use a get nearest object script to work with raycasting but its not quite working.

 public Transform GetNearestTaggedMouseObject()
     {
         var nearestDistanceSqr = Mathf.Infinity;
         var taggedGameObjects = GameObject.FindGameObjectsWithTag("waypoint"); 
         Transform nearestObj2 = null;
         Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
         RaycastHit hit;
         //Debug.DrawRay (ray.origin, ray.direction * 20, Color.red);
             
             if (Physics.Raycast(ray, out hit, 20)) 
             {
                 Vector3 destPoint = hit.point;
                 
                 foreach (var obj in taggedGameObjects)
                 {
                     var objectPos = obj.transform.position;
                     var distanceSqr = (objectPos - destPoint).sqrMagnitude;
                     
                     if (distanceSqr < nearestDistanceSqr)
                     {
                         nearestObj2 = obj.transform;
                         nearestDistanceSqr = distanceSqr;
                     }
                 }
             }
         if(Input.GetMouseButtonDown(0))
             moving2 = true;
         if(Vector3.Distance(transform.position, nearestObj2.transform.position) <= .1)
             moving2 = false;
         if(moving2 == true)
         {
             transform.LookAt(nearestObj2);
             transform.position = Vector3.MoveTowards(transform.position, nearestObj2.transform.position, Time.deltaTime);
         }
         return nearestObj2;
     }

This will make the controller move and follow the mouse cursor but not where you have clicked. I have also tried to put the raycast inside the if(Input.GetMouseButtonDown(0)) but it just made it so I had to hold down the mouse button for some reason. If there is a better way to do this without raycasting, I think I would rather do it that way but i haven't found anything else yet.

Answer 1

Answer by jogo13 · Jan 07, 2013 at 07:38 AM

I may be reading it wrong but i don't think you'll need raycasting for this.

Once you've got a waypoint you can just calculate the distance from your current point:

 float distance = Vector3.Distance(transform.position, waypoint.transform.position);

You'll need to go through all the waypoints and only keep the one with the shortest distance of course.

I would avoid using : foreach (var obj in taggedGameObjects) as even components are considered objects. (And may mean even more in javascript...)

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spitu · Jan 07, 2013 at 07:14 PM 0

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sorry. I should have gave more detail of what this does. What it should do is select the nearest tagged object in a group of objects closest to where mouse is clicked and then the player should move to that object. AT$$anonymous$$ the player is moving towards and will follow the mouse cursor and not where you click.

Get nearest object by using raycast

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