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publishing interactive 3D in pdf files: see supplementary file 2 of
Barnes et al 2013 PloS One
D.G. Barnes et al 2013 Embedding and Publishing Interactive,
3-Dimensional, Scientific Figures in Portable Document Format (PDF)
Files. PlOS One
http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0069446#s5