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  • [Unity3D]Creating Spine SkeletonAnimation using C#script

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I want to create a Spine SkeletonAnimation that uses C#script using Unity3D like this:

public void CreateCharacter()
        {
                SkeletonAnimation playerAnim;
                SkeletonDataAsset playerData;
                AtlasAsset atlasdata;
                string name = "01_01_ani";

            atlasdata = ScriptableObject.CreateInstance<AtlasAsset> ();
            playerData = ScriptableObject.CreateInstance<SkeletonDataAsset> ();
            atlasdata.atlasFile = (TextAsset)Resources.Load (name + ".atlas");
            Material[] materials = new Material[1];
            materials [0] = new Material (Shader.Find ("Transparent/Diffuse"));
            Texture aa = (Texture)Resources.Load (name);
            materials [0].mainTexture = aa;
            
            atlasdata.materials = materials;
            
            playerData.atlasAsset = atlasdata;
            playerData.skeletonJSON = (TextAsset)Resources.Load (name + ".json");

            GameObject player = new GameObject();
            player.transform.localPosition = Vector3.zero;
            player.transform.localScale = new Vector3 (1f, 1f, 1f);

            playerAnim = (SkeletonAnimation)player.AddComponent ("SkeletonAnimation");
            playerAnim.skeletonDataAsset = playerData;
            playerAnim.calculateNormals = true;
            playerAnim.AnimationName = "running";
            playerAnim.loop = true;
    }

But It brought on an error like this:

"Missing SkeletonData asset."
"NullReferenceException: Object reference not set to an instance of an object"
"ArgumentException: Getting control 1's position in a group with only 1 controls when doing Repaint
Aborting"

I would like to find out what the problem with this such method and would like to know how to create a Spine Skeleton Animation using C#script from Unity3D?
Is there any other way(other than the method I used)to create a Spine Skeleton Animation using C#script from Unity3D?

Thanks in advance.

Are you new to using Unity?
I'm guessing you came from a much lower-level framework before.
Unity was designed for productivity and setting basic things up is usually done less in code and more in the editor interface. (ie, all instantiation stuff is taken care of by virtue of how runtimes/plugins were coded to work with Unity, working with how Unity automatically sets up a scene or instantiates pre-set-up hierarchies of objects called "prefabs".)

In any case, you should check the Spine examples and the video.
Read the readme here:
https://github.com/EsotericSoftware/spi ... pine-unity

As Pharan mentioned, I don't know this is a standard thing to do in Unity, but maybe when you add the SkeletonAnimation component it calls Reset and you get the "Missing SkeletonData asset" error. Maybe you can create and configure the SkeletonAnimation, then add it. But a prefab is probably better.

I guess, in theory, something like this is useful for automating things and not cluttering up the project folder with material, SkeletonData and Atlas assets.

Just to humor/explore the use case.

I got this:

Missing SkeletonData asset.
UnityEngine.Debug:LogError(Object, Object)
SkeletonRenderer:Reset() (at Assets/Spine/SkeletonRenderer.cs:81)
SkeletonAnimation:Reset() (at Assets/Spine/SkeletonAnimation.cs:65)
SkeletonRenderer:Awake() (at Assets/Spine/SkeletonRenderer.cs:99)
UnityEngine.GameObject:AddComponent()
SpineAssembler:GenerateCharacter() (at Assets/SpineAssembler.cs:33)
SpineAssembler:Start() (at Assets/SpineAssembler.cs:13)

and then this:

NullReferenceException: Object reference not set to an instance of an object
SkeletonDataAsset.GetSkeletonData (Boolean quiet) (at Assets/Spine/SkeletonDataAsset.cs:87)
SkeletonRenderer.Reset () (at Assets/Spine/SkeletonRenderer.cs:84)
SkeletonAnimation.Reset () (at Assets/Spine/SkeletonAnimation.cs:65)
SpineAssembler.GenerateCharacter () (at Assets/SpineAssembler.cs:36)
SpineAssembler.Start () (at Assets/SpineAssembler.cs:14)

Looks like it just has a few issues. Some seem easier to address than others.
I'm not sure why after this whole process, the mesh isn't generated until I click on the new object in the inspector. (at which point, it throws some inspector-related errors.)
I think these are the same three errors OP got.

Here's the SpineAssembler class I made but it's not working yet.

using UnityEngine;
using System.Collections;

public class SpineAssembler : MonoBehaviour {

   // INSPECTOR ASSIGNED STUFF FOR TESTING
   public Texture textureAsset;
   public TextAsset atlasFile;
   public TextAsset jsonFile;

   GameObject characterObject;
   SkeletonAnimation skeletonAnimation;

   void Start ()
   {
      GenerateCharacter();
   }

   void GenerateCharacter ()
   {
      var atlasAsset = ScriptableObject.CreateInstance<AtlasAsset>();
      atlasAsset.atlasFile = atlasFile;

  var atlasMaterial = new Material(Shader.Find("Spine/Skeleton"));
  atlasMaterial.mainTexture = textureAsset;

  atlasAsset.materials = new[] { atlasMaterial };

  var skeletonDataAsset = ScriptableObject.CreateInstance<SkeletonDataAsset>();
  skeletonDataAsset.atlasAsset = atlasAsset;
  skeletonDataAsset.skeletonJSON = jsonFile;
  skeletonDataAsset.scale = 0.01f;

  characterObject = new GameObject("0 THINGY");

  skeletonAnimation = characterObject.AddComponent<SkeletonAnimation>();
  skeletonAnimation.skeletonDataAsset = skeletonDataAsset;
  skeletonAnimation.Reset();

  skeletonAnimation.state.SetAnimation(0, "walk_0", true);
   }
}
6 days later

Just posting to say that I'm trying to get this working myself! I have an entirely script-based Unity Framework that I've built up over the years (I don't like the way scenes and prefabs work as they are extremely hard to merge if you're working on a team, and they are generally impossible to port to other frameworks which I often have to do when I'm done prototyping in Unity).

That said! I'm kinda close. I'm getting the same error you are at this point and am working on a clean patch to the spine-unity classes to get it cleaned up. Should have something tonight!

Also, as for why I'd want to do things this way, I have a ton of characters in this game with minor randomized variations. To do that I need to switch what textures and anims they point to dynamically, and ideally I'd have everything working entirely in script so I can set breakpoints and actually see what's going wrong with dudes. Anyway!

Mine was missing the Skeleton data as well today . Unity and 2d tool kit, I just keep doing , it over and over, and it worked, its acting very buggy. I was unsure if its SPine or Unity, because Unity 4.3.4 has been a bit buggy . So as I said I keep trying and it worked. Sadly I have a few more to do, so I'm afraid its going to do it again for the rest, it took me over 4 hours to get it working.

3 years later

Hey guys,

Any progress on this yet?

I have a project with dozens of skeletons per character (top down 4 sided game), and whenever I am in need of updating skeletons it is quite the hazzle to manually replace the skeletons of the prefabs.

I could save a ton of time by creating the skeleton animator from script and assign it to a root game object instead of creating a prefab manually each time. 🙁