Is there a way to make a follow script without NavMesh?

Clearly there are games that do not use Unity's navmesh and still have AI pathfinding and whatnot, so it becomes a question of how much work you are willing to do to that end.

It's important to ask the right questions. The answer to your current question posed here is "yes, of course", but it sounds like the actual question you want to ask is "what happened to my project to break the navmesh system?"

Do you know what happened? Look at the link.

It sounds like this is something for work or school (by the deadline), so the urgency is noted.

What are you looking for as far as "follow script" is concerned? Just something to slowly approach some other object? You presumably care about obstacles, or you likely wouldn't bother with setting up a navmesh agent system.

There is a bit here, but this will be 90% comments as this seems to be for class / education.

Create an empty scene, make two cubes, attach this to one of them. Then set the other cube as its follow target.

It will look like this: **http://i.imgur.com/FwX4wxU.gifv**

 using UnityEngine;
 using System.Collections;
 
 public class SimpleFollow : $$anonymous$$onoBehaviour
 {
     // Pick a target to see how this works
     public float followSpeed = 0.1f;
     public Transform followTarget;
 
     // Update is called once per frame
     void Update ()
     {
         // Call the function we wrote below.  It can get a bit ugly
         // if you put a bunch of code in a function like Update().
         //
         this.Follow (this.followTarget, fSpeed: this.followSpeed);
     }
 
     void Follow (Transform target, float fSpeed = 1)
     {
         // There are more elegant and modular ways to do this, but it sounded like
         // you needed a very simple example to get started.
         //
         // First, we'll deter$$anonymous$$e how much we should 
         // be moving.  Vector3.$$anonymous$$oveTowards() will give 
         // you a vector in the direction we want and 
         // then set that vector's magnitude to whatever 
         // we supply for the 3rd parameter.  In this case, 
         // we're calling this every frame, so we want 
         // to move a certain amount of units each second.  
         // We accomplish this by multiplying that distance 
         // by the change in time.
         //
         Vector3 newPosition = Vector3.$$anonymous$$oveTowards(this.transform.position, target.position, fSpeed * Time.deltaTime);
 
         // If you wanted to update the animations, you might do so here.  
         // Animation control schemes vary from project to project, 
         // so your own code will differ from someone else's.
         //
         /* Animation stuff here */
     
         // Lastly, assign the values we calculated above
         this.transform.position = newPosition;
         this.transform.LookAt (target.position, this.transform.up);
     }
 }
 

I'm not familiar with that specific controller, but this is your assignment. I was hesitant to even post that much, but the desperation egged me beyond typical scaffolding territory.

These forums are not a place where you should look for homework problems to be magically solved. You have nearly all of the work done for you, with the remaining problem being syncing an animation to this.

Hint: magnitude comes into play.