Find nearest enemy object in radius

Question

Hi all, I am trying to create RTS. What is the best and less costly (fps) way to find nearest UNITY object (with tag "Enemy") in some radius . Physics.OverlapSphere, Circle Collider 2d or compare all object positions every frame (I think this way is not good when i have many units ) ? Is there a better way ? (Sorry, I forgot to mention that the game is 2d)

Answer 1

Answer by cjdev · Jan 20, 2016 at 12:25 AM

The fastest way would be to compare the square of the distance between them to save on the time that the square root function costs. You can use the built-in properties for this:

 // Compare between all nearby enemies to find the nearest:
 (transform.position - enemy.transform.position).sqrMagnitude

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Le-Pampelmuse · Jan 20, 2016 at 08:51 AM 1

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Hi, don't you think it's your responsibility as well to keep the forum organized? ;) You shouldn't encourage users to post off-topic questions by validating them with an answer.

cjdev · Jan 20, 2016 at 08:59 AM 0

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How is it off-topic to ask about implementing a specific game mechanic while including a method already tried? You know RTS means Real-Time Strategy game right?

Answer 2

Answer by teuba · Jan 20, 2016 at 08:17 AM

You could use Vector3.Distance() to find enemy in your radius.

 // The advantage is, no need of physics engine
 if(Input.GetMouseButtonDown(0))
 {
     foreach(ScriptOnYourEnemies e in FindObjectsOfType< ScriptOnYourEnemies>())
     {
         if(Vector3.Distance(e.transform.position, transform.position) < radiusYouWant)
         {
             // An enemy is in your radius
             e.GetHurt(); // Hit the enemy for example
         }
     }
 }

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Find nearest enemy object in radius

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