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                                                  819
       SECTION 9.5                                                                     3D Artwork



       SCHEME          DESCRIPTION

       CAD             Three grey infinite lights and one light attached to the camera, no
                       ambient term
                         Light 1       Color: < 0.72, 0.72, 0.81 > Direction: < 0.0, 0.0, 0.0 >
                         Light 2       Color: < 0.2, 0.2, 0.2 >     Direction: < -2.0, -1.5, -0.5 >
                         Light 3       Color: < 0.32, 0.32, 0.32 > Direction: < 2.0, 1.1, -2.5 >
                         Light 4       Color: < 0.36, 0.36, 0.36 > Direction: < 0.04, 0.01, 2.0 >

       Headlamp        Single infinite light attached to the camera, low ambient term
                          Light 1        Color: < 0.8, 0.8, 0.9 >  Direction: < 0.0, 0.0, 0.0 >
                          Ambient        Color: < 0.1, 0.1, 0.1 >

       Note: If a lighting scheme style is encountered other than those described in Table
       9.45, the lighting scheme dictionary containing that entry should be ignored. This
       allows future documents using new lighting schemes to behave consistently with fu-
       ture documents using new 3D view constructs. That is, the expected behavior is for
       the viewer application to ignore unrecognized lighting styles and 3D view con-
       structs.


       3D Cross Section Dictionaries

       A 3D cross section dictionary (PDF 1.7) specifies how a portion of the 3D artwork
       is clipped for the purpose of showing artwork cross sections. The SA entry of a
       3D view can specify multiple 3D cross section dictionaries.

       Cross sections enable viewer applications to display otherwise hidden parts of the
       artwork. They also allow users to comment on cross sections, using markup an-
       notations. For example, markup annotations can be used apply markup annota-
       tions to a cross section or to measure distances in a cross section. If multiple cross
       sections are specified for a view, the markup annotations in the view apply to all
       cross sections in the view.

       Table 9.46 shows the entries in a 3D cross section dictionary.

                        TABLE 9.46 Entries in a 3D cross section dictionary
KEY    TYPE          VALUE

Type   name          (Optional) The type of PDF object that this dictionary describes; if present, must be
                     3DCrossSection for a 3D cross section dictionary.

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