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                                               28
      CHAPTER 1                                                               Introduction



      A color plate section provides illustrations of some of PDF’s color-related fea-
      tures. References in the text of the form “see Plate 1” refer to the contents of this
      section.

      The book concludes with a Bibliography and an Index.


 1.2 Introduction to PDF 1.7 Features

      Several features have been introduced or modified in PDF 1.7. The following is a
      list of the most significant additions, along with references to the primary sec-
      tions where those additions are discussed:


1.2.1 Presentation of 3D Artwork

      PDF 1.7 introduces new features that increase the control the PDF viewing appli-
      cation has over the appearance and behavior of 3D artwork:
      • More control over the appearance of 3D artwork, without having to change the
        original artwork and without the use of embedded JavaScript. Specific views of
        3D artwork can specify how that artwork should be rendered, colored, lit, and
        cross-sectioned. They can also specify which nodes (three-dimensional areas)
        of 3D artwork should be included in a view, where those nodes should be
        placed in the view, and whether they should be transparent. These features can
        expose areas of geometry that would otherwise be difficult to view.
      • The ability to place markup annotations on specific views of 3D artwork. This
        ensures that markups applied to 3D artwork can later be shown properly with
        respect to both the artwork as a whole and individual elements within the art-
        work. Markup annotations applied to 3D artwork provide a means of ensuring
        the artwork has not changed since the markup annotation was applied.
      • Control over the user interfaces and toolbars presented on activation of 3D art-
        work.
      • Control over the timeframe, repetition, and style of play of keyframe anima-
        tions. The styles of play are linear repetition (as in a walking character) and a
        cosine-based repetition (as in an exploding-contracting image).

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