Copyright Goodheart-Willcox Co., Inc. 272 AutoCAD and Its Applications—Advanced Boxes, wedges, and pyramids have square base grips at the corners that allow the size of the base to be changed. See Figure 11-1. The object dynamically changes in the viewport as you select and move the grip or after you type the new coordi- nate location for the grip and press [Enter]. If ortho is off, the length and width can be changed at the same time by dragging the grip, except in the case of a pyramid. The triangular parameter grips on the base allow the length or width to be changed. The height can be changed using the top parameter grip. Each object has one parameter grip for changing the height of the apex and one for changing the height of the plane on which the base sits. A pyramid also has a parameter grip at the apex for changing the radius of the top. Cylinders, cones, and spheres have four parameter grips for changing the radius of the base, or the cross section in the case of a sphere. See Figure 11-2. Cylinders and cones also have parameter grips for changing the height of the apex and the height of the plane on which the base sits. Additionally, a cone has a parameter grip at the apex for changing the radius of the top. A torus has a parameter grip located at the center of the tube. See Figure 11-3. This grip is used to change the radius of the torus. Parameter grips at each quadrant of the tube are used to change the radius of the tube. Figure 11-1. Boxes, wedges, and pyramids have square base grips at the corners of the base, a parameter grip at the center of the base or bottom edge, and parameter grips on the sides of the base and center of the top face, edge, or vertex. Figure 11-2. Cylinders, cones, and spheres have four parameter grips for changing their radius. Cylinders and cones have parameter grips for changing their height. Cones also have a parameter grip for changing the radius of the top. Figure 11-3. A torus has a parameter grip located at the center of the tube for changing the radius of the torus. There are also parameter grips for changing the radius of the tube.