TextureSlicer.cs

using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using Unity.VisualScripting;
using UnityEditor;
using UnityEngine;

public class TextureSlicer : MonoBehaviour
{
    public Texture2D inputTexture;
    public GameObject sphere;
    private Texture2D[,] sliced;
    private float elapsedTime = 0.0f;
    private int tileCounter = 0;

    void SplitTexture(Texture2D texture, int width, int height, out Texture2D[,] theSlicedTexture)
    {
        int xTiles = texture.width / width;
        int yTiles = texture.height / height;

        theSlicedTexture = new Texture2D[xTiles, yTiles];

        for (int y = 0; y < yTiles; y++)
        {
            for (int x = 0; x < xTiles; x++)
            {
                Color[] pixels = texture.GetPixels(x * width, y * height, width, height);
                theSlicedTexture[x, y] = new Texture2D(width, height);
                theSlicedTexture[x, y].SetPixels(pixels);
                theSlicedTexture[x, y].Apply();
            }
        }
    }

    // Start is called before the first frame update
    void Start()
    {
        Debug.Log("slicing");

        SplitTexture(inputTexture, 8192, 8192, out sliced);

        string path = "Assets/sliced0.asset";
        AssetDatabase.CreateAsset(sliced[0,0], path);
        AssetDatabase.SaveAssets();

        Debug.Log("done");
    }

    // Update is called once per frame
    void Update()
    {
        elapsedTime += Time.deltaTime;

        if(elapsedTime > 1.0f)
        {
            int hozTileCount = sliced.GetLength(0);
            int verTileCount = sliced.GetLength(1);

            int x = tileCounter % hozTileCount;
            int y = tileCounter / hozTileCount;

            sphere.GetComponent<Renderer>().material.mainTexture = sliced[x, y];

            tileCounter += 1;

            if (tileCounter == hozTileCount * verTileCount) tileCounter = 0;

            elapsedTime = 0.0f;
        }
    }
}