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I have a PDF file with a 3D object and when I display the file inAcrobat Reader 7.0 the "Model Tree" is not being displayed.
User needs to have at a minimum Acrobat Reader or Acrobat Professional7.0.7 in order to be able to see the "Model Tree". Attached is asnapshot of this being detailed in the Acrobat Professional 8.0 helpfile.