Page 239 - Enhancing CAD Drawings with Photoshop
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4386.book  Page 223  Monday, November 15, 2004  3:27 PM
                                                                               RENDERING IN AUTODESK VIZ  223



                          Omni lights illuminate in all directions, and two are used for basic or ambient light in the
                          scene. These are set to render with a multiplier of 0.5 (each at half of normal intensity) so as not
                          to wash out the scene with too much illumination. Because the omnis simulate ambient light,
                          they are not set to cast shadows. One omni light source is below the ground plane; this acts as
                          a backlight to round out illumination on the building.

                          A direct light is positioned in relation to the building as if it were the sun in the midafternoon.
                          You will be using the direct light to cast shadows on the building later in this section.

                    NOTE    If you are interested in making a more accurate lighting simulation, use the Sunlight system
                       instead of a direct light in VIZ. The Sunlight system is an accurate sun-angle calculator that takes
                       geographic location and time into account to locate the light source.
                          A single camera is also provided in the scene to get you started framing your composition. The
                          building model itself is composed of several objects. To investigate this, look at objects by name:
                       3. Open the Select Objects dialog box (press H), as shown in Figure 7.2. All the objects in the scene
                          are shown, including the lights and the camera. To display a listing of the geometrical objects
                          only, click the None button in the List Types group, and then check Geometry to display this
                          category in the list box.

                  Figure 7.2
                  Geometrical objects in
                  the scene

















                       4. Click the first item in the list, in this case Framing, and then click the Select button to close the
                          Select Objects dialog box. Right-click in the viewport, and choose Hide Unselected from the
                          display quad.
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