Question by menguzat · Jun 05, 2020 at 12:08 PM · scripting problem texture webgl

Cannot change material texture with script in WebGL build (but I can in the editor/game)

I'm building a project for WebGL in unity, using universal rendering pipeline.

The scene is simple: just a cube. I assigned an URP/Lit material to the cube, and assigned a default basemap to the texture.

This renders fine in WebGL.

The problem begins when I try to fetch a texture from an URL. I have a text field in the HTML that embeds the player and I use this function to send a message to unity:

function loadit() { var url=document.getElementById('url').value; unityInstance.SendMessage('Cube','LoadTheTexture',url); }

This actually calls the following function in unity:

public async Task LoadTheTexture(string url) { _texture = await GetRemoteTexture( url );

 _texture.wrapMode=TextureWrapMode.Clamp;
 Renderer rend = GetComponent<Renderer>();
 rend.sharedMaterial.SetTexture("_BaseMap",  _texture);
 return _texture;

}

I know that it works because it fetches the texture (GetRemoteTexture is a function that uses UnityWebRequestTexture.GetTexture, which works.

The console logs

     "[CachedXMLHttpRequest] 'http://xxxxxxx/DSF0374-copy-scaled.jpg' downloaded successfully (743969 bytes) and stored in indexedDB cache".
 However, nothing changes.

In the editor/game everything works fine - it fetches and replaces the texture of the material.

But in the WebGL build, nothing changes - the default texture remains.

Any idea what might be the cause?

GetRemoteTexture function:

    public static async Task<Texture> GetRemoteTexture ( string url )
     {
         using( UnityWebRequest www = UnityWebRequestTexture.GetTexture( url ) )
         {
             //begin requenst:
             var asyncOp = www.SendWebRequest();
     
             //await until it's done: 
             while( asyncOp.isDone==false )
             {
                 await Task.Delay( 1000/30 );//30 hertz
             }
     
             //read results:
             if( www.isNetworkError || www.isHttpError )
             {
                 //log error:
                 #if DEBUG
                 Debug.Log( $"{ www.error }, URL:{ www.url }" );
                 #endif
     
                 //nothing to return on error:
                 return null;
             }
             else
             {
                 //return valid results:
                 return DownloadHandlerTexture.GetContent( www );
             }
         }

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