Question by imaethan · Jun 13, 2014 at 01:27 PM · movement navmesh java nav mesh

Implementing nav mesh into point and click movement

So I've got a basic point and click movement script but whenever I've tried to implement using a navmesh it doesn't really work correctly. I've got the nav mesh set up properly, as I've got some basic AI that uses it and follows the player. Any help would be much appreciated.

      var clickEffect : GameObject;
 
         private var targetPosition:Vector3;
 
         var speed = 60;
 
         
          
 
         function Update () {
         
         
         
        
             if(Input.GetKeyDown(KeyCode.Mouse0))
 
             {
 
            speed = 5;
 
             smooth=1;
 
             
 
                 var playerPlane = new Plane(Vector3.up, transform.position);
 
                 var ray = Camera.main.ScreenPointToRay (Input.mousePosition);
 
                 var hitdist = 0.0;
 
                
 
                 if (playerPlane.Raycast (ray, hitdist)) {
 
                     var targetPoint = ray.GetPoint(hitdist);
 
                     targetPosition = ray.GetPoint(hitdist);
 
                     var targetRotation = Quaternion.LookRotation(targetPoint - transform.position);
 
                     transform.rotation = targetRotation;
 
                     
 
                 
 
                 }
 
              
 
             }
 
             
 
                 var dir:Vector3 = targetPosition - transform.position;
 
     var dist:float = dir.magnitude;
 
     var move:float = speed * Time.deltaTime;
 
     if(dist > move){
 
     transform.position += dir.normalized * move;
     Instantiate(clickEffect,targetPosition,Quaternion.identity);
     
     
     
     animation.CrossFade ("run");
 
     } else {
 
     transform.position = targetPosition;
     
     animation.CrossFade ("idle");
 
     }
 
            
 
            
 
             transform.position += (targetPosition - transform.position).normalized * speed * Time.deltaTime; 
 
            
 
       
 
          
 
          
 
          }
          
          
          function OnCollisionEnter (hit : Collision) {
          
          if (hit.gameObject.tag == "wall") {
          
          print ("hit");
          
                   targetPosition = transform.position;
                   
                   
          
          }
          
          
          
          }

Add comment · Show 7

stuart6854 · Jun 13, 2014 at 01:31 PM 0

Sorry, what doesn't work/happen?

imaethan · Jun 13, 2014 at 01:53 PM 0

Well this is my basic movement script. I'm trying to add so that it follows the navmesh ins$$anonymous$$d of just trying to run straight through objects. I tried adding in some navmesh commands but it didn't work. For example I would have "var navComponent : Nav$$anonymous$$eshAgent;" at the top.

then under function Start I would have:

 "navComponent = this.transform.GetComponent(Nav$$anonymous$$eshAgent);"

Just not sure if this next bit is correct and where to put it.

 "navComponent.SetDestination(target.position);"

This is my movement (link)

iwaldrop · Jun 13, 2014 at 05:16 PM 0

What do you mean by, 'doesn't work correctly'? It appears to be working correctly to me. Perhaps you mean it's not working as desired. How would you desire it work?

imaethan · Jun 13, 2014 at 05:23 PM 0

Like with the navmesh being used. So that when let's say, there's an object in the way. He runs around it, via the navmesh. Ins$$anonymous$$d of straight into it.

alt text

Sorry I didn't make that clear.

iwaldrop · Jun 13, 2014 at 05:37 PM 0

It seems like you have colliders that allow you to click the walls. If you want to click a wall, but walk around to the other side, then I'd suggest using colliders on a certain layer, and constrain your raycast to that layer only. This way you can control which surfaces in the world respond to touching.

iwaldrop · Jun 13, 2014 at 06:51 PM 0

Another possibility is that you haven't added Nav$$anonymous$$eshObstacles to some objects that should have them. The docs don't mention whether this is a pro feature or not, but they cut a hole in the navmesh when objects which have them are placed or moved.

Watching your video again, when you click on the wall for instance, what do you expect it to do? Generally speaking, the Nav$$anonymous$$eshAgent is doing what it's supposed to do. Adding special geometry to keep the Nav$$anonymous$$esh from being too close to walls is a possibility, but you can also do a raycast forward while moving and stop if the raycast hits anything. The length of the ray would be the distance at which you'd want the character to stop moving at away from a wall.

imaethan · Jun 13, 2014 at 07:20 PM 0

It's cut holes where the objects are. I've got a basic AI to use the navmesh, it follows the player and goes around objects to do so. The video was just a demonstration of how the movement works. If you look at the image of the scene I posted, if I clicked the other side of the wall he wouldn't go around, he'd just walk into the wall and stop.