static public List <UnityEngine.Vector3> ListFromVtArray(VtVec3fArray input)
        {
            var output = UsdIo.ArrayAllocator.Malloc <UnityEngine.Vector3>(input.size());

            unsafe
            {
                fixed(UnityEngine.Vector3 *p = output)
                {
                    input.CopyToArray((IntPtr)p);
                }
            }
            return(output.ToList());
        }
 static public void FromVtArray(VtVec3fArray input, ref UnityEngine.Vector3[] output)
 {
     if (output.Length != input.size())
     {
         output = UsdIo.ArrayAllocator.Malloc <UnityEngine.Vector3>(input.size());
     }
     unsafe
     {
         fixed(UnityEngine.Vector3 *p = output)
         {
             input.CopyToArray((IntPtr)p);
         }
     }
 }