title: How to create a USDZ file?
body: <p>I tried to look at the main documentation at <a href="http://graphics.pixar.com/usd/docs/index.html" rel="noreferrer">http://graphics.pixar.com/usd/docs/index.html</a> and <a href="http://graphics.pixar.com/usd/docs/Usdz-File-Format-Specification.html" rel="noreferrer">http://graphics.pixar.com/usd/docs/Usdz-File-Format-Specification.html</a> but could not find the details to create a <code>usdz</code> file. </p>
  
  <p>I can get some sample USD files from <a href="http://graphics.pixar.com/usd/downloads.html" rel="noreferrer">http://graphics.pixar.com/usd/downloads.html</a> </p>
  
  <p>How can we create one?</p>