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                                                  811
   SECTION 9.5                                                                                3D Artwork




               FOV circle




                                                           Z axis projected onto near plane




FIGURE 9.6 Objects projected onto the near clipping plane, as seen from the position of the camera


   The PS entry specifies the diameter that this circle will have when the graphics
   projected onto the near plane are rendered in the annotation’s 3D view box (see
   Figure 9.7). Although the diameter of the circle determines the scaling factor,
   graphics outside the circle are also displayed, providing they fit within the view
   box, as seen in the figure.

   Figure 9.8 shows the entire 3D annotation. In this case, the 3D view box is smaller
   than the annotation’s rectangle, which also contains 2D content outside the 3D
   view box.


                      3D Annotation’s 3DB box




                                                Z axis projected onto near plane,
                                                aligned with center of 3DB box,
                                                scaled to fit the width of the 3DB box


      FIGURE 9.7 Positioning and scaling the near plane onto the annotation’s 3D view box

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