AI Script walking on terrain

Questions & Answers
1

i was looked Some script in internet But all have problem while my enemy model Walk on Terrain…

i am triying use Character Controller and Character Motor But my character Turn Face To Y axiss if target point y axis value diffrent.

How i can write script ignore target y axis?

This is my code …

using UnityEngine;
using System.Collections;

public class EnemyAI : MonoBehaviour {
	public Transform target;
	public int moveSpeed;
	private Vector3 centerPoint;
	private float distance;
	private CharacterController character;	
	private Vector3 targetpoint ;
	private Vector3 moveDirection;
	private int gnp = 0; 
	
	void Awake(){
		centerPoint = transform.position;
	}
	

	void Start () {
		 character = GetComponent<CharacterController>();
	}

	void Update () {	
		Walk();
	}

	void GotoTargetPoint(){

			animation.CrossFade ("walk");
			Vector3 moveDirection  = targetpoint - transform.position;	
		
			if (moveDirection.magnitude < 2){
				switch(gnp){
					case 10:
						gnp = 1;
						Debug.Log("GNP " + gnp);
					break;
				
					case 20 :
						gnp=0;
						Debug.Log("GNP " + gnp);
					break;
				}
				
			}else{
				transform.LookAt(targetpoint);
				character.Move(moveDirection.normalized * moveSpeed * Time.deltaTime);	
			}
	}
	
	
	void GetNewPoint(){
		targetpoint =  new Vector3(Random.Range(-13.0F, 13.0F), 0, Random.Range(-13.0F, 13.0F));
		targetpoint = targetpoint + transform.position;
		targetpoint.y = Terrain.activeTerrain.SampleHeight(targetpoint);
		gnp = 10;			
	}
	void Walk(){
		if (gnp == 0){
			GetNewPoint();
			Debug.Log("GNP " + gnp);
		}
		if (gnp == 1 ){
			targetpoint=centerPoint;
			gnp = 20;
			Debug.Log("GNP " + gnp);
		}	
		GotoTargetPoint();
	}
		
}
2

Copy targetpoint to a variable flatTarget, and copy the player’s Y coordinate to it, so that flatTarget and the player will be at the same plane:

...
void GotoTargetPoint(){

    animation.CrossFade ("walk");
    // create a "flat" targetpoint copying the player's y coordinate:
    Vector3 flatTarget = targetpoint;
    flatTarget.y = transform.position.y;
    Vector3 moveDirection = flatTarget - transform.position; // use flatTarget instead of targetpoint   
    if (moveDirection.magnitude < 2){
        switch(gnp){
            case 10:
                gnp = 1;
                Debug.Log("GNP " + gnp);
            break;
            case 20 :
                gnp=0;
                Debug.Log("GNP " + gnp);
            break;
        }
    }else{
        transform.LookAt(flatTarget); // <- look at the flatTarget point
        character.Move(moveDirection.normalized * moveSpeed * Time.deltaTime);  
    }
}