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A material that conducts electricity. Conductors include all metals. Their opposites, nonconductors, are referred to as dielectric materials, such as air or glass. Generally, conductors are opaque and dielectrics transparent. Some materials, such as certain types of plastics that could be considered as dielectrics, yet appear opaque, do so because structurally they are compound materials containing suspensions of conducting materials. This material classification is important when a shader uses a physically based illumination model.
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