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In complicated scenes, displaying only specified colors can produce a poor result, because adjacent shapes that have the same colors blend together, making it difficult for viewers to discern what the scene represents. Imagine a cube where sides all have the same color displayed on a two-dimensional surface. The sides would blend so that one couldn't tell where one side ended and the next began. To help solve such problems, one can improve the realism of Direct3D scenes by using a lighting model and materials, letting Direct3D change the colors of objects depending on their relative orientation to light sources and the viewing position.
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