ARCore – not changing alpha on material after changing BlendMode through code.

Anyone got any ideas why in ARCore I’m not seeing a smooth fade of the material after I change the material blend mode? I’ve tested the following code and in the editor/Game mode it’s working fine. Also the fade routine is working fine in ARCore if I set the material blend mode to “standard>fade” (or transparent) in the Material Inspector, then the routine works fine and I get a nice fade in ARCore and the editor.

However, I need to switch modes on the fly as I have multiple items to fade out and I can’t get Unity to play well with them (z-sorting issues). So the best logic I can find is to change the blend mode whilst fading in/out, then set to “Standard > Opaque” once done. BUT…. This does not appear to be working in ARCore. I see the modes are changing, as you can see z-buffering sorting issues come and go as it switches between modes, but the fading is no longer happening.

Any ideas?

Thanks in advance for any help

 void Start()
     {
         myRenderer = GetComponent<Renderer>();
         solidColor = myRenderer.material.color;
         fadedColor = new Color(solidColor.r, solidColor.g, solidColor.b, 0f);
       //  myRenderer.material.renderQueue = 4001;
         Debug.Log(myRenderer.material.renderQueue);
         material = myRenderer.material;
     }
     public void startFading()
     {
        // go = true;
         Debug.Log("startFading - bb-working");
         if (!fading)
         {
             StartCoroutine(Fade());
         }
 
     }
 
     IEnumerator Fade()
     {
 
         material.SetFloat("_Mode", 2);
         material.SetInt("_SrcBlend", (int)UnityEngine.Rendering.BlendMode.One);
         material.SetInt("_DstBlend", (int)UnityEngine.Rendering.BlendMode.OneMinusSrcAlpha);
         material.SetInt("_ZWrite", 0);
         material.DisableKeyword("_ALPHATEST_ON");
         material.DisableKeyword("_ALPHABLEND_ON");
         material.EnableKeyword("_ALPHAPREMULTIPLY_ON");
         material.renderQueue = 3000;
 
         Debug.Log("coruntine started for skin");
         fading = true;
         Color fromColor = faded ? fadedColor : solidColor;
         Color toColor = faded ? solidColor : fadedColor;
         for (var t = 0f; t < fadeTime; t += Time.deltaTime)
         {
             Debug.Log("fading skin");
             //currentColor = Color.Lerp(fromColor, toColor, t / fadeTime);
             myRenderer.material.color = Color.Lerp(fromColor, toColor, t / fadeTime);
             yield return null;
         }
         if (toColor == solidColor)
         {
             material.SetFloat("_Mode", 0);
             material.SetInt("_SrcBlend", (int)UnityEngine.Rendering.BlendMode.One);
             material.SetInt("_DstBlend", (int)UnityEngine.Rendering.BlendMode.Zero);
             material.SetInt("_ZWrite", 1);
             material.DisableKeyword("_ALPHATEST_ON");
             material.DisableKeyword("_ALPHABLEND_ON");
             material.DisableKeyword("_ALPHAPREMULTIPLY_ON");
             material.renderQueue = -1;
         }
 
         fading = false;
         faded = !faded;
     }