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Bounding Regions

Before we start using these new features, though, you must understand a concept that's common to all of them—bounding regions. A bounding region is a volume of space that contains objects that are affected by a particular background, light, sound, or fog. By associating each of these "environmental" nodes with a bounding region, we can easily limit the range of their effect on the scene.

To see why this is important, consider the following hypothetical example. You've built a small virtual house, three stories high with a number of rooms. Your living room is well lit, with a number of floor lamps and an overhead light. The basement, immediately below it, is quiet and dark, lit by a single candle. The television is on in the living room, while upstairs a small portable radio is playing. The kitchen is full of smoke from a roast that's burning in the oven.


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