Mesuring distance through script

Question

I have a turret script that in its previous version would use a trigger to judge if it was to shoot at an enemy. That worked okay, but enemies would have to enter the trigger one by one. I want it so that it uses a script to decide if an enemy is in range. I believe that this will solve my issue. Thanks!

  var distance;
     var Look : boolean = false;
     var Target : Transform;
     var damp : float;
     var Projectile : Transform;
     var Shell : Transform;
     var MuzzleFlash : Transform;
     var fireRate : float =  5;
     var Speed : int = 2000;
     var ShellSpeed : int = 500;
     var TurretAudio : AudioClip; 
     var TurretAnimation : AnimationClip;
     static var ammo : int = 250;
     var AMMO : int;
     var AttackDistance = 10.0;
     
     private var nextFire = .5;
     
     function Update()
     {
         distance = Vector3.Distance(Target.position, transform.position);
         
         if(distance < AttackDistance)
         {
             if(gameObject.tag == "Enemy")
             {
                 Look = true;
                 if(!Target)
                 {
                     Target = gameObject.transform;
                 }
             }
          
         if(Look && Target != null)
         {
             var rotate = Quaternion.LookRotation(Target.position - transform.position);
             
             transform.rotation = Quaternion.Slerp(transform.rotation, rotate, Time.deltaTime * damp);
             Shoot();
         }
         
         AMMO = ammo;
         }
     }
     
     function Shoot()
     {
         if(ammo > 0)
         {
         if(Time.time > nextFire)
         {
             nextFire = Time.time + fireRate;
                 
                 var muzzleflash = Instantiate(MuzzleFlash, transform.Find("Spawn").transform.position, transform.rotation);
                 
                 var projectile = Instantiate(Projectile, transform.Find("Spawn").transform.position, transform.rotation);    
                 projectile.rigidbody.AddForce(transform.forward * Speed); 
                 
                 var shell = Instantiate(Shell, transform.Find("Spawn_2").transform.position, transform.rotation);
                 shell.rigidbody.AddForce(transform.right * ShellSpeed);
                 
                 audio.PlayOneShot(TurretAudio);
                 animation.Play(TurretAnimation.name);
             ammo --;
         }
     }
     }

REVSIDED CODE:

  var Look : boolean &#61; false;
     var Target : Transform;
     var damp : float;
     var Projectile : Transform;
     var Shell : Transform;
     var MuzzleFlash : Transform;
     var fireRate : float =  5;
     var Speed : int = 2000;
     var ShellSpeed : int = 500;
     var TurretAudio : AudioClip; 
     var TurretAnimation : AnimationClip;
     static var ammo : int = 250;
     var AMMO : int;
     var ViewDistance = 10.0;
     var AttackDistance = 8.0;
     
     private var nextFire = .5;
     
     function Update()
     { 
         distance = Vector3.Distance(Target.position, transform.position);
         if(distance < ViewDistance)
         { 
         
         if(distance < AttackDistance)
         { 
         
         if(gameObject.tag == "Enemy")
         { 
             Look = true; 
             if(!Target) 
             {
                 Target = gameObject.transform; 
             } 
         }
     
         if(Look && Target != null)
         { 
             
             var rotate = Quaternion.LookRotation(Target.position - transform.position);        
     
             transform.rotation = Quaternion.Slerp(transform.rotation, rotate, Time.deltaTime * damp); 
         
             Shoot(); 
         }
     
                 AMMO = ammo; 
             } 
         } 
     }
     
     function Shoot()
     {
         if(ammo > 0)
         {
         if(Time.time > nextFire)
         {
             nextFire = Time.time + fireRate;
                 
                 var muzzleflash = Instantiate(MuzzleFlash, transform.Find("Spawn").transform.position, transform.rotation);
                 
                 var projectile = Instantiate(Projectile, transform.Find("Spawn").transform.position, transform.rotation);    
                 projectile.rigidbody.AddForce(transform.forward * Speed); 
                 
                 var shell = Instantiate(Shell, transform.Find("Spawn_2").transform.position, transform.rotation);
                 shell.rigidbody.AddForce(transform.right * ShellSpeed);
                 
                 audio.PlayOneShot(TurretAudio);
                 animation.Play(TurretAnimation.name);
             ammo --;
         }
     }
     }

Answer 1

Best Answer

Answer by Montraydavis · Oct 31, 2012 at 02:16 PM

To get distance, do this...

 var TurretDistance : float = (transform.position - Target.transform.position).sqrMagnitude * (transform.position - Target.transform.position).sqrMagnitude ;

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Major · Oct 31, 2012 at 02:19 PM 0

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Thanks for replying so fast. I will try that when I can get to my computer. Thanks!

Montraydavis · Oct 31, 2012 at 02:21 PM 0

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You are welcome :) Feel free to mark as answered, or vote up if this ends up working for you. Thanks for using Unity :)

Answer 2

Answer by Tim-Michels · Oct 31, 2012 at 02:34 PM

Well if you simply want the distance between 2 points, there's a simpler option:

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

This should be the simplest and quickest way of getting the distance.

Cheers ;)

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Major · Oct 31, 2012 at 03:05 PM 0

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I also need to limit how far the turrets can see. How would I integrate that?

Tim-Michels · Oct 31, 2012 at 03:19 PM 0

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You could add a member ViewDistance and only perform further checks for attacking if the distance is smaller than ViewDistance.

I hope that covers your question...

Major · Nov 07, 2012 at 02:49 PM 0

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Can you give me an example? I am new in this area.

Tim-Michels · Nov 07, 2012 at 03:11 PM 0

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Well, first you add a new var in your script: var ViewDistance = 10.0;

Then you Update function should look something like this:

function Update() { distance = Vector3.Distance(Target.position, transform.position); //Calculate distance every frame

if(distance < ViewDistance) //Check if distance is smaller than maximum view distance { //Only perform further checks when the target is in viewing range. //If the target is further than the ViewDistance, its not needed to calculate further stuff if(distance < AttackDistance) { if(gameObject.tag == "Enemy") { Look = true; if(!Target) { Target = gameObject.transform; } }

if(Look && Target != null) { var rotate = Quaternion.LookRotation(Target.position - transform.position);

transform.rotation = Quaternion.Slerp(transform.rotation, rotate, Time.deltaTime * damp); Shoot(); }

A$$anonymous$$$$anonymous$$O = ammo; } } }

Sorry for the bad code formatting, just copy paste it in your script, code doesn't look good in a comment

thumbs up ;)

Major · Nov 16, 2012 at 12:19 AM 0

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Okay so I have posted the code that I used from you comment and integrated it into my previous code. Although all it is doing is creating a giant lag machine and won't target anything.

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Mesuring distance through script

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