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You can apply matte/shadow materials to objects to make portions of the model invisible. This lets any objects behind the object or in the background show through. This material is also helpful for compositing 3D objects into a photographic background. Objects with matte/shadow materials applied can also cast and receive shadows. The effect of these materials is visible only when the object is rendered.
You can apply a matte/shadow material by clicking the Type button and selecting Matte/Shadow from the Material/Map Browser. Matte/shadow materials include only a single rollout: the Matte/Shadow Basic Parameters.