TrailTravelTile

using UnityEngine;
using System.Collections;
using System.Collections.Generic;

public class TrailTravelTile : MonoBehaviour {
    public int materialIndex = 0;
    public Vector2 unitTiling = new Vector2( 1.0f, 1.0f );

    float uvOffset = 0.0f;

    public bool randomStartU = false;

    public List<string> textureList = new List<string>();


    Vector3 lastWorldPosition;
    float distanceTravelled;

    Material material;

    // Use this for initialization
    void OnEnable () {
        lastWorldPosition = transform.position;
        distanceTravelled = 0;
        if(randomStartU)
        {
            uvOffset = Random.Range(0.0f,1.0f);
        }

        if (GetComponent<Renderer>() == null)
        {
            Debug.LogError("Failed to get renderer on: " + gameObject, gameObject);
            enabled = false;
            return;
        }
        material = (GetComponent<Renderer>().materials != null && GetComponent<Renderer>().materials.Length > materialIndex) ? GetComponent<Renderer>().materials[materialIndex] : null;
        if (!material)
        {
            Debug.LogError("Failed to get Material: " + gameObject, gameObject);
            enabled = false;
            return;
        }
    }

    // Update is called once per frame
    void LateUpdate () {
        if(transform.position != lastWorldPosition){
            Vector3 distanceRef = lastWorldPosition - transform.position;

            distanceTravelled += Mathf.Abs(Vector3.Magnitude(distanceRef));

            if (GetComponent<Renderer>() && GetComponent<Renderer>().enabled && material)
            {
                Vector2 xyScale = new Vector2(distanceTravelled * unitTiling.x, unitTiling.y);
                Vector2 xyOffset = new Vector2((1-(xyScale.x - Mathf.Floor (xyScale.x))) + uvOffset, 0); // make it stretch from opposite side of trail. Also randomize offset U

                for (int i = 0; i < textureList.Count; i++){
                    material.SetTextureScale(textureList[i], xyScale);
                    material.SetTextureOffset(textureList[i], xyOffset);
                }
            }
            lastWorldPosition = transform.position;
        }
    }
}