Copyright Goodheart-Willcox Co., Inc. 460 AutoCAD and Its Applications—Advanced Maps Maps As discussed in previous sections, images and textures may be applied to mate- rials to enhance the color, glossiness, refl ectivity, transparency, translucency, cutouts, self illumination, and bumpiness. The applied image or texture is called a map. A material that has a map applied to at least one of its properties is called a mapped material. An image or texture applied to a material property may be 2D or 3D. A 2D texture, also called a texture map, is really just an image that is stretched over the surfaces of the object. It may be thought of as a fi xed set of pixels, kind of like a mosaic pattern, applied to the object’s surfaces. A 3D texture, sometimes referred to as a procedural map, is mathematically generated based on the colors that you select. This texture extends through the object, similar to textures in the “real world.” For example, if you attach AutoCAD’s wood map (3D texture) to a material property and assign the material to an object with a cutout, the grain in the cutout will match the grain on the exterior. An image (2D texture) applied to this same object will “reapply” itself to the cutout surface, not necessarily matching the pattern on the adjacent surfaces. There are nine types of maps in AutoCAD that can be applied to material proper- ties. The image, checker, gradient, and tiles maps are 2D texture maps. The marble, noise, speckle, waves, and wood maps are 3D texture maps. Each map has unique settings, as discussed in the next sections. PROFESSIONAL TIP PROFESSIONAL TIP The term map may be applied to the type of texture or the property to which the texture is applied. For example, a checker map may be used as a bump map. Checker is the type of map and bump is the property to which the texture is applied. A B Figure 17-22. The effect of a bump map. A—This image will be used as the bump map. B—When applied to the material, the bump map simulates an embossed stamp on the metal case. A full-color image is provided on the companion website. www.g-wlearning.com/CAD/