Page 239 - Enhancing CAD Drawings with Photoshop
P. 239
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.