Copyright Goodheart-Willcox Co., Inc. Chapter 17 Materials in AutoCAD 475 PROFESSIONAL TIP PROFESSIONAL TIP If you are using a refl ectivity, self illumination, or bump map and need to adjust it at the object level, you cannot see the effects of the mapping change in the viewport. Apply the same map as a color map. Also, set the visual style to display materials and textures. Then, adjust the object mapping as needed. The edits are dynamically displayed in the viewport. When the image is in the correct location, remove the color map from the material. Exercise 17-6 www.g-wlearning.com/CAD/ Complete the exercise on the companion website. Chapter Review Answer the following questions using the information in this chapter. 1. Define material. 2. Define materials library. 3. What is the Favorites section of the Library area of the materials browser used for? 4. Describe how to attach a material using the materials browser. 5. How can materials be attached to layers? 6. By default, which material is attached to newly created objects? 7. Which material is used as the base material for creating new materials? 8. Name the 13 shapes that can be used to display the material in the preview in the materials editor. 9. How do you know if a material in the materials browser is being used in the drawing? 10. How can the name of an existing material be changed? 11. Name the 14 basic material types. 12. When creating a material to look like plastic, what is the benefit of using the plastic material type instead of starting from scratch using the generic material? 13. In the Reflectivity category of the generic material, there are Direct and Oblique properties. What are these used for? 14. An image mapped to a material property will normally repeat itself to cover the entire object. What is this called and how do you turn it off? 15. When a cutout map is applied to a material, what are the different effects produced by black and white areas in the image? 16. How much illumination does a self illuminated material add to a scene? 17. How is a marble material created? 18. Explain how black and white areas of a map applied to the Transparency property affect the transparency of a material. 19. Explain what the nodes in the ramp of a gradient map are for. 20. Name the four types of mapping available for adjusting texture maps at the object level.