Unity绘制Png图片

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

public class DrawBlockMeshTexture : MonoBehaviour {

    // Use this for initialization
    void Start () {
        int size = ;
        Texture2D colorTxt = new Texture2D(* size, * size);
        //colorTxt.filterMode = FilterMode.Point;
        for (int i = ; i != colorTxt.height; i++)
        {
            int lat = i / size;
            // 纬线圈lat上对应的方块个数
            int blockNumAtLatitude = Mathf.CeilToInt( * Mathf.Cos((lat-) * Mathf.Deg2Rad));
            if (blockNumAtLatitude == )
                continue;
            // 每一个小块对应的像素跨度
            int pixPerBlock = colorTxt.width / blockNumAtLatitude;
            for (int j = ; j != colorTxt.width; j++)
            {
                if (j % pixPerBlock == )
                    colorTxt.SetPixel(j, i, Color.green);
                if (i % size == )
                    colorTxt.SetPixel(j, i, Color.red);
            }
        }
        colorTxt.Apply();
        byte[] bytes = colorTxt.EncodeToPNG();
        File.WriteAllBytes(Application.dataPath + "/BlockMeshTexture.png", bytes);
    }

    // Update is called once per frame
    void Update () {

    }
}