title: Aframe and AR.js does not show my .gltf model
body: <p>i am new about aframe and arjs, i would to show my own gltf models over an hiro path, i write this code:</p>
  <pre><code>&lt;!-- include A-Frame obviously --&gt;
  &lt;script src=&quot;https://aframe.io/releases/0.6.0/aframe.min.js&quot;&gt;&lt;/script&gt;
  &lt;!-- include ar.js for A-Frame --&gt;
  &lt;script src=&quot;https://jeromeetienne.github.io/AR.js/aframe/build/aframe-ar.js&quot;&gt;&lt;/script&gt;
  
  &lt;body style='margin : 0px; overflow: hidden;'&gt;
    &lt;a-scene embedded arjs&gt;
      &lt;!-- define your gltf asset --&gt;
      &lt;!--This is for add a text--&gt;
      &lt;a-text value=&quot;Hello, World!&quot;&gt;&lt;/a-text&gt;
      &lt;a-assets&gt;
        &lt;a-asset-item id=&quot;tree&quot; src=&quot;models/gltf/manovella.gltf&quot;&gt;&lt;/a-asset-item&gt;
      &lt;/a-assets&gt;
      &lt;a-entity gltf-model=&quot;##tree&quot;&gt;&lt;/a-entity&gt;
      &lt;!-- define a camera which will move according to the marker position --&gt;
      &lt;a-marker-camera preset='hiro'&gt;&lt;/a-marker-camera&gt;
    &lt;/a-scene&gt;
  &lt;/body&gt;
  </code></pre>
  <p>when i run my code and lace an hiro marker from of the cam i just see &quot;Hello world!&quot; text and not my own model, i check browser console error but i don't gen anything.</p>
  <p>Someone can help me about? Where i was wrong for load my own model?</p>
  <p>so many thanks in advance</p>