title: draw transparent 3d cube model in arcore android
body: <p>i have create cube using shapefactor in arcore android but it is not transparent. How can can i make model transparent so in which it is placed It shows the background view. I have found only below method for create 3d cube model </p>
  
  <pre><code>MaterialFactory.makeTransparentWithColor(this,new Color(248,248,248))
                  .thenAccept(
                          material -&gt; {
                            ShapeFactory.makeCube(vector3, Vector3.zero(), material);
  
                          });
  </code></pre>
  
  <p>PLease help for making cube semi transparent so i can background view will be shown.</p>