Adjust car UV map from atlas based on ID

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

public class AdjustUV : MonoBehaviour {

    public Vector2 tiles = Vector2.one;
    public int index = -1;
    public bool adjusted;

    void Awake() {
        index = -1;
        adjusted = false;
    }

    void Update() {
        if (!adjusted) {
            Adjust();
            adjusted = true;
        }

    }

    void Adjust () {

        if (index == -1)
        {
            Car car = GetComponent<Car>();
            if (car != null)
            {
                index = car.id;
            }
        }

        int tileX = (index % (int)tiles.x);
        int tileY = Mathf.FloorToInt(index / tiles.x);
        float shiftX = (1 / tiles.x) * tileX;
        float shiftY = (1 / tiles.y) * tileY;

        Vector2 shift = new Vector2( shiftX, shiftY );

        var meshes = new List<Mesh>();

        foreach (Transform t in GetComponentsInChildren<Transform>())
        {
            MeshFilter mf = t.GetComponent<MeshFilter>();
            if (mf != null)
            {
                Vector2[] uv = mf.mesh.uv;
                for (int n=0; n<uv.Length; ++n)
                {
                    uv[n] += shift;
                }
                mf.sharedMesh.uv = uv;
                meshes.Add(mf.sharedMesh);
            }
        }
    }

}