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<p>Simple game AI can be hard to figure out in Unity 3D without add-ons. Fortunately, you can use a simple C# script to have an enemy chase a player. Make sure your Player object has the &#8220;Player&#8221; tag set. Then add this script to your enemy object, and set the &#8220;Move Speed&#8221; and &#8220;Rotation&#8221; speed to values that work for your game. Make sure you have sprites set for both your player and enemy game objects. Then run the game. Here is the script:</p>
<blockquote><p>using UnityEngine;</p>
<p>using System.Collections;</p>
<p> ;</p>
<p>public class EnemyAI : MonoBehaviour {</p>
<p>public Transform target;</p>
<p>public int moveSpeed;</p>
<p>public int rotationSpeed;</p>
<p> ;</p>
<p>private Transform myTransform;</p>
<p> ;</p>
<p>// Use this for initialization</p>
<p>void Awake() {</p>
<p>myTransform = transform;</p>
<p>}</p>
<p> ;</p>
<p>void Start () {</p>
<p>GameObject go = GameObject.FindGameObjectWithTag(&#8220;Player&#8221;);</p>
<p> ;</p>
<p>target = go.transform;</p>
<p>}</p>
<p> ;</p>
<p>// Update is called once per frame</p>
<p>void Update () {</p>
<p>Vector3 dir = target.position &#8211; myTransform.position;</p>
<p>dir.z = 0.0f; // Only needed if objects don&#8217;t share &#8216;z&#8217; value</p>
<p>if (dir != Vector3.zero) {</p>
<p>myTransform.rotation = Quaternion.Slerp (myTransform.rotation,</p>
<p>Quaternion.FromToRotation(Vector3.right, dir), rotationSpeed * Time.deltaTime);</p>
<p>}</p>
<p> ;</p>
<p>//Move Towards Target</p>
<p>myTransform.position += (target.position &#8211; myTransform.position).normalized * moveSpeed * Time.deltaTime;}</p>
<p>}</p></blockquote>
<p>Let us know how it works for you or if you have a better script, in the comments below!
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<p><em>Original script by <a href="https://answers.unity.com/users/95255/penfwasaurus.html">penfwasaurus</a>. Updated by <a href="https://answers.unity.com/users/16320/robertbu.html">robertbu</a>. Compiled, tested and used by <a href="http://marketinghackers.net/about/">Marketing Hackers</a>. Originally published at <a href="https://answers.unity.com/questions/604858/simple-ai-in-2d-c.html">Unity Answers</a>.</em>

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