Enemy Ai unityscript movement issue - unity3d

Question

The code I am using currently makes the enemy notice me at a distance then follow me if I get closer. The issue I am having is with how they move. I am building a Minecraft style game but I cant get the enemies to stay on the ground and jump up each block like I have too with the fps controller. They just seem to float the shortest distance possible towards me.
Code:
var target : Transform; //the enemy's target
var moveSpeed = 3; //move speed
var rotationSpeed = 3; //speed of turning
var range : float=10f;
var range2 : float=10f;
var stop : float=0;
var myTransform : Transform; //current transform data of this enemy
function Awake()
{
myTransform = transform; //cache transform data for easy access/preformance
}
function Start()
{
target = GameObject.FindWithTag("1Player").transform; //target the player
}
function Update () {
//rotate to look at the player
var distance = Vector3.Distance(myTransform.position, target.position);
if (distance<=range2 && distance>=range){
myTransform.rotation = Quaternion.Slerp(myTransform.rotation,
Quaternion.LookRotation(target.position - myTransform.position), rotationSpeed*Time.deltaTime);
}
else if(distance<=range && distance>stop){
//move towards the player
myTransform.rotation = Quaternion.Slerp(myTransform.rotation,
Quaternion.LookRotation(target.position - myTransform.position), rotationSpeed*Time.deltaTime);
myTransform.position += myTransform.forward * moveSpeed * Time.deltaTime;
}
else if (distance<=stop) {
myTransform.rotation = Quaternion.Slerp(myTransform.rotation,
Quaternion.LookRotation(target.position - myTransform.position), rotationSpeed*Time.deltaTime);
}
}

Answer 1

Okay now here is what you are missing:
1.Lock the rotation on x and z axis to zero
myTransform.eulerAngles = new Vector3(0f, myTransform.eulerAngles.y, 0);
Just add this line at the end.
2.Make a short distance raycast in front of the AI and if it detects some obstacle, stop the current movement and move by y axis, if there is no obstacle move like you wrote in your script.
As for the raycasting goes, there is no need for me to write it here, you can find more info about it in Unity3D documentation here:
http://docs.unity3d.com/ScriptReference/Physics.Raycast.html and this tutorial is good for staters: https://unity3d.com/learn/tutorials/modules/beginner/physics/raycasting