Basic Shapes, ContinuedSpheresSpheres are round. The distance from the center of the sphere to any edge ofthe sphere is known as the radius. The radii of spheres extend equally in alldirections from the center. A sphere appears round regardless of viewpointor perspective. Shading on spheres is soft and gradual with no abrupt planescreating sharp contrasts. Changing the length of the radii creates ellipses.Use ellipses to define the depth of spheres.Figure 3-12 shows the dimensions of a sphere.Figure 3-12.—Radii.Figure 3-13 shows how ellipses define the depth of a sphere.Figure 3-13.—Ellipsesdefine the depth of a sphere.Continued on next page3-13
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