Combine Array of Sprite objects into One Sprite - Unity

Question

I have an array of Sprite objects in Unity. Their size vary depending on the image loaded. I want to combine them side by side like a tiled map into one image. I want them to be

Answer 1

There is PackTextures method in Texture2D class, but since it makes your atlas square you can't make a line of sprites, so there is another way to do it by reading pixels of images and setting them to new image,it's really expensive to do in runtime but gives you the result.

// Your textures to combine
// !! After importing as sprite change to advance mode and enable read and write property !!
public Sprite[] textures;

public Texture2D atlas;    // Just to see on editor nothing to add from editor
public Material testMaterial;
public SpriteRenderer testSpriteRenderer;

int textureWidthCounter = 0;
int width,height;
private void Start () {
    width = 0;
    height = 0;

    foreach(var  t in textures) {
        width += t.texture.width;
        
        if (t.texture.height > height)
            height = t.texture.height;
    }
    
    atlas = new Texture2D(width,height, TextureFormat.RGBA32,false);
    
    for (int i = 0; i < textures.Length; i++)
    {
        int y = 0;

        while (y < atlas.height) {
            int x = 0;

            while (x < textures[i].texture.width ) {
                if (y < textures[i].texture.height) 
                     atlas.SetPixel(x + textureWidthCounter, y, textures[i].texture.GetPixel(x, y));  // Fill your texture
                else atlas.SetPixel(x + textureWidthCounter, y,new Color(0f,0f,0f,0f));  // Add transparency
                x++;
            }
            y++;
        }
        atlas.Apply();
        textureWidthCounter +=  textures[i].texture.width;
    }
    
    // For normal renderers
    if (testMaterial != null)
        testMaterial.mainTexture = atlas;

    // for sprite renderer just make  a sprite from texture
    var s = Sprite.Create(atlas, new Rect(0f, 0f, atlas.width, atlas.height), new Vector2(0.5f, 0.5f));
    testSpriteRenderer.sprite = s;

    // add your polygon collider
    testSpriteRenderer.gameObject.AddComponent();
}