Help with atlas.packtextures

Hello, today I'm trying to create a sprite solution and it seems I get the concept. But no matter what I try I can't get the sprite to be applied to the object's material.

SpriteAtlasHandler:

 using UnityEngine;
 using System.Collections;
 
 public class SpriteAtlasHandler : MonoBehaviour {
     
     public Texture2D[] atlasTextures;
     
     public Rect[] rects;
     
     // Use this for initialization
     void Start () {
         Texture2D atlas = new Texture2D(1024, 1024);
         rects = atlas.PackTextures(atlasTextures, 2, 1024);
     }
     
     // Update is called once per frame
     void Update () {
     
     }
     
     public void SetUV(int rectNum, bool Mirroed, Mesh mesh, int Direct, Texture texture){
         Vector2[] newUV = new Vector2[mesh.uv.Length];
         
         Vector2 start = new Vector2(rects[rectNum].x, rects[rectNum].y);
         Vector2 size = new Vector2(rects[rectNum].width, rects[rectNum].height);
         
         newUV[0] = start + size;
         newUV[1] = start + Vector2.right * size.x;
         newUV[2] = start + Vector2.up * size.y;
         newUV[3] = start;
         
         mesh.uv = newUV;
         
         texture = atlasTextures[0];
     }
 }

SpriteHandler:

 using UnityEngine;
 using System.Collections;
 
 public class SpriteHandler : MonoBehaviour {
     
     public SpriteAtlasHandler atlasHandler;
     public Mesh thisMesh;
     
     // Use this for initialization
     void Start () {
     }
     
     // Update is called once per frame
     void Update () {
         atlasHandler.SetUV(0, false, thisMesh, 0, renderer.material.mainTexture);
     }
 }