Hi,

I just made it work. I needed to make the direction vector relative to the NPC's own orientation and I removed the Util.ProjectOntoPlane() function and it is working pretty well. If you are creating a planet like game, and you are using Rune's locomotion system, this will make your NPC's follow your character around the planet.

Just to clear things out, you don't need to use locomotion (I'm not using locomotion for my NPC's, just for the player). For the NPC's I'm using Rune's PhysicsCharacterMotor.cs (which uses the CharacterMotor.cs). The NPC's also have a CapsuleCollider, a RigidBody, the FollowerController I created based on Rune's Follower script and one extra script to call the Follow() and the Stop() methods of the FollowerController script.

Hope is helpful for other people.

using UnityEngine;
using System.Collections;

public class FollowController : MonoBehaviour 
{
    private CharacterMotor motor;

    // Follow settings
    public float desiredDistance;
    public float walkMultiplier = 0.5f;

    // Use this for initialization
    void Start () {
        motor = GetComponent(typeof(CharacterMotor)) as CharacterMotor;
        if (motor==null) 
            Debug.Log("Follow Controller: Motor is null!!");    
    }

    // Moves the character according to the received target.
    public void Follow (Transform target) 
    {
        // get direction to target
        Vector3 targetVector = target.position-transform.position;
        float speed = (targetVector.magnitude-desiredDistance)*2;

        Vector3 directionVector = targetVector.normalized * speed;

        // Make direction vector relative to character's own orientation
        directionVector = Quaternion.Inverse (transform.rotation) * directionVector;

        motor.desiredMovementDirection = directionVector;
        motor.desiredFacingDirection = targetVector;
    }

    public void Stop ()
    {
        motor.desiredMovementDirection = Vector3.zero;  
    }

}