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The images shown in the 3D display are rendered using OpenGL, therefore the quality and speed of the rendered scenes in the 3D display is dependent on the graphics card in the computer running the application. Computers with graphics cards that do not support OpenGL acceleration will still be able to display images, but the quality and speed with which the images are displayed may be markedly reduced. To help alleviate situations like this, multiple ``levels of detail" are supported ranging from ``Fastest" to ``Best" which adjust the quality of the rendered scenes accordingly. For most computers purchased within the past year, ``Best" level of detail should be appropriate.
In addition to the ``level of detail", the scene can be further adjusted by modifying a few select OpenGL parameters such as the background color as well as the lighting and material models. All of these parameters can be adjusted in the Preferences (see chapter 12). The ``level of detail" can also be changed by selecting the desired option in the ``Render Quality" pulldown menu in the Display section in the Graphics page of the Style Window (see figure 5.1).
Beneath the above mentioned pulldown menu, is the Projector Mode check box which toggles whether or not the 3D display should be drawn on a light background using the light background color palette. For more information on color palettes see section 5.7.3. The default is to draw on a dark (black) background using the dark background color palette. The Projector Mode is particularly useful when the application is being viewed from an LCD projector. The default light and dark color palettes can be adjusted in the Preferences (see chapter 12).
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