Otherwise, the accumulation of files into larger worlds would produce unscalable results (as each added world produces global effects on all other worlds).
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For example, light sources have the potential of global effect since light energy theoretically does not dissipate to zero.
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And, if the earth file contains 100 city files each containing 100 lights each affecting all objects in the world, the lighting calculations would quickly become intractable.
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Therefore, in order to prevent global effects, light source objects are scoped by either a maximum radius or by location within the file.
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