Loading Textures from AssetBundle

Question

I am currently working on a Vuforia AR Project. I am working on a part where I have an assetbundle containing png textures. There are around 177 textures. I want to download them and make them play in a sequence on a plane. This is my code for the downloading and playing part:

 public class TextureLoadScript : MonoBehaviour
 {
     Texture2D[] tex = new Texture2D[177];
 
     Material GoMaterial;
 
     int frameCounter = 0;
 
     public TrackableBehaviour trackableBehaviour;
 
     public string imageSequenceName="ImageSequenceName_";
 
     public string FolderName="Resources/ImageSequence";
 
     public int numOfFrames;
 
     AssetBundle bundle;
 
     bool playing;
 
     bool isLoading;
 
     void Awake()
     {
         this.GoMaterial = this.renderer.material;
 
     }
     // Use this for initialization
     void Start () 
     {
         if (trackableBehaviour) {
             trackableBehaviour.RegisterTrackableEventHandler (this);
         }
         tex[0] = (Texture2D)bundle.Load(FolderName+imageSequenceName+"00000",typeof(Texture2D));
     }
     // Update is called once per frame
     void Update () 
     {
         if(isLoading)
         {
             StartCoroutine("Download");
         }
         if(playing)
         {
             StartCoroutine("Play",0.0588f);
             GoMaterial.mainTexture = tex[frameCounter];
         }
     }
     IEnumerator Download()
     {
 
         string url = "mteam@mobilesandbox.cloudapp.net/IntroScene_android_android.unity3d";
         WWW download = WWW.LoadFromCacheOrDownload(url,1);
         yield return download;
         if(download.error!=null)
         {
             Debug.LogError(download.error);
             
         }
         bundle=download.assetBundle;
         Debug.Log ("Bundle Loaded Successfully"+bundle.name);
         isLoading = true;
     }

     IEnumerator Play(float delay)
     {
         yield return new WaitForSeconds(delay);
          if(frameCounter<numOfFrames-1)
         {
             ++frameCounter;
 
             tex[frameCounter] = (Texture2D)bundle.Load(FolderName+imageSequenceName+frameCounter.ToString("D5"),typeof(Texture2D));
         } 
         else
         {
             playing = false;
         }
     }

During runtime it shows object reference not set to the instance of an object. I can see I am close enough. But I am not able to proceed further. Kindly help me on this

Answer 1

This code has some logic errors:

in Start you're accessing "bundle" but it isn't initialized yet, since you're initializing it in Download
numOfFrames is never assigned, so it'll be ever 0
I think bundle.Load accepts only the name of the resource, not a path

Here is how I would do:

 using UnityEngine;
 using System.Collections;
 using System.Collections.Generic;
 
 public class TextureLoadScript : MonoBehaviour {
 
     Material GoMaterial;
     public TrackableBehaviour trackableBehaviour;
     public string imageSequenceName="ImageSequenceName_";
     AssetBundle bundle;
     bool playing;
     bool isLoading;
     
     void Start () 
     {
         if (trackableBehaviour) {
             trackableBehaviour.RegisterTrackableEventHandler (this);
         }
         GoMaterial = renderer.material;
         isLoading = true;
         StartCoroutine(Download());
         StartCoroutine(Play(0.0588f));
     }
 
     IEnumerator Download()
     {
         
         string url = "mteam@mobilesandbox.cloudapp.net/IntroScene_android_android.unity3d";
         WWW download = WWW.LoadFromCacheOrDownload(url,1);
         yield return download;
         if (!string.IsNullOrEmpty(download.error))
         {
             Debug.LogError(download.error);
         }
         else
         {
             bundle = download.assetBundle;
             Debug.Log ("Bundle Loaded Successfully" + bundle.name);
         }
         isLoading = false;
     }
     
     IEnumerator Play(float delay)
     {
         while (isLoading)
             yield return null;
         playing = true;
         if (bundle != null)
         {
             List<Texture2D> textures = new List<Texture2D>((Texture2D[])bundle.LoadAll(typeof(Texture2D)));
             for (int frameCounter = 0; frameCounter < textures.Count; ++frameCounter) {
                 Texture2D tex = textures.Find(t => t.name.Equals(imageSequenceName + frameCounter.ToString("D5")));
                 if (tex != null)
                     GoMaterial.mainTexture = tex;
                 yield return new WaitForSeconds(delay);
             }
         }
         playing = false;
     }
 }

Loading Textures from AssetBundle

1 Reply

Your answer

Follow this Question

Related Questions