Unity3d 4.3 get sprite from atlas

Archived Forums Questions & Answers
1

Hello, i have atlas (many sprites have one packing tag), how i can get list of all sprites, or get one sprite by name?
I don’t believe that only way is Load from resources (Resources.Load)

How are the sprites packed? I'm assuming you have a text file that is defining your sprites. If not, then you can define and name your sprites with the built in [Sprite Editor][1]. [1]: http://docs.unity3d.com/Documentation/Manual/SpriteEditor.html

 –

Otherwise, you will have to use a library or script a way to parse your definition file and build the sprites based on that.

 –

no, i just set packing tag on all sprites http://gyazo.com/763b09cb50e38bb49c91d2d3f621b18d.png I realized this tag is needed to sprites united in atlases, and I think there should be a mechanism for obtaining sprites from atlases. I do bubble shooter, and have many colored balls sprites (with different pictures on it), i make enum BallColor { red, blue ... e.t.c.} and when i set enum on prefab - blue, i want to load sprite equals blueball, and i think that load it from resources very stupid... For example in 2d toolkit i can load sprite by name from atlas.

 –

You have sprite mode set to Single, you have to change it. Then, an edit button will appear and clicking it will open the [Sprite Editor][1] where you can define and name your sprites. [1]: http://docs.unity3d.com/Documentation/Manual/SpriteEditor.html

 –

Are you using Unity's built in Sprite Packer?

 –

4 Answers

4
3

You can’t access the sprites directly from a Texture2d set up as a sprite atlas.

You can however access them from the texture’s asset. The texture is the main asset and all sprites are sub assets.

This should work:
Let me know if there are any errors.

void doSomethingWithAtlasSprites(Texture2D atlas)
{
  String atlasPath;
  Object[] atlasAssets;

  atlasPath = AssetDatabase.GetAssetPath(atlas);
  atlasAssets = AssetDatabase.LoadAllAssetsAtPath(atlasPath);

  foreach(Object asset in atlasAssets)
  {
    if(AssetDatabase.IsSubAsset(asset))
    {
      //asset is a sprite.....
      //do something
      //add it to a list maybe
    }
  }
}
5

It is a part of my working code. Hope it helps.

public Texture2D spritesheetTexture = null;
private Sprite[] spritesArray = null;
//===============================================================================
private void LoadSpritesFromSpritesheet ()
{
if (this.spritesheetTexture == null) return;

if (this.spritesArray != null) this.spritesArray = null;

UnityEngine.Object[] spritesAsObjects = AssetDatabase.LoadAllAssetRepresentationsAtPath (AssetDatabase.GetAssetPath (this.spritesheetTexture));

if (spritesAsObjects == null) return;

this.spritesArray = new Sprite[spritesAsObjects.Length];

for (int i = 0; i < spritesAsObjects.Length; i++)
{
this.spritesArray _= spritesAsObjects *as Sprite;*_

}
}
//===============================================================================
* public Sprite GetSpriteByName (string spriteName, Sprite[] spriteArray)*
{
for (int i = 0; i < spriteArray.Length; i++)
{
if (spriteArray*.name.Equals (spriteName))*
{
return spriteArray*;*
}
}

return null;
}

I don't know is it correct and efficient way, but it works:) Unity Editor only. Use Resources.LoadAll instead if deploying for example on a device.

 –
2

I’m also looking for a way to get the material from a Sprite reference but the best I’ve been able to come up with right now is to have a SpriteRenderer from that packing tag present in your scene and then getting the sharedMaterial from that SpriteRenderer at runtime.

4

Use Unity’s built in Sprite Packer， how to load atlas?