using Aspose.ThreeD;

var scene = Scene.FromFile("$inputFile");
string text = null;
try
{
  scene.RootNode.Accept((Node node) =>
  {
    var mesh = node.GetEntity<Mesh>();
    if (mesh != null)
    {
         text = Watermark.DecodeWatermark(mesh, "1234");
         if (text != null)
            return false;
    }
    return true;
  });
}
catch (UnauthorizedAccessException)
{
    return "Password error";
}
return text; 
                                    

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