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Other examples of discrete material variation include brick and mortar walls or wood framing with insulation, which can be procedurally generated to fill a layer covering a CAD model of a building.
A second type of material variation is used to describe finer detail, more homogeneous variation in material such as concrete or wood grain. These details are probably too small relative to the model to be represented with separate volumetric elements, but can be effectively represented with a solid texture.
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