Sprite Merger in Unity

SpriteMerger.cs

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


// Merge multiple Sprites as one sprite
public static class SpriteMerger {
    public static Sprite MergeSprite(Sprite[] sprites) {
        // 스프라이트 중 가장 큰 크기의 것으로 지정되야함
        int width = 0;
        int height = 0;


        foreach (var sprite in sprites)
        {
            width = Mathf.Max(width, sprite.texture.width);
            height = Mathf.Max(height, sprite.texture.height);
        }

        Texture2D mergedTexture = new Texture2D(width, height);
        // mergedTexture.alphaIsTransparency = true;

        for (int i = 0; i < width; i++)
        {
            for (int j = 0; j < height; j++)
            {
                mergedTexture.SetPixel(i, j, Color.clear);
            }
        }

        // overdrawn by last one
        foreach (var sprite in sprites)
        {
            for (int y = 0; y < sprite.texture.height; y++)
            {
                for (int x = 0; x < sprite.texture.width; x++)
                {
                    Color extractedPixel = sprite.texture.GetPixel(x, y);

                    Color replacedColor = mergedTexture.GetPixel(x, y);

                    replacedColor = (1.0f - extractedPixel.a) * replacedColor + extractedPixel.a * extractedPixel;

                    mergedTexture.SetPixel(x, y, replacedColor);
                }
            }

            mergedTexture.Apply();
        }


        Sprite mergedSprite = Sprite.Create(mergedTexture, new Rect(0, 0, width, height), new Vector2(0.5f, 0.5f));

        return mergedSprite;
    }
}