Copyright Goodheart-Willcox Co., Inc. Chapter 18 Lighting 503 In the Image position: drop-down list, pick how the image is applied to the view- port. The Center option centers the image in the view without changing its aspect ratio or scale. The Stretch option centers the image and stretches or shrinks it to fi ll the entire view. This is one way to plot an image fi le from AutoCAD. The Tile option keeps the image at its original size and shape, but moves it to the upper-left corner and dupli- cates it, if needed, to fi ll the view. After the image is positioned, use the sliders to adjust it further. The sliders are disabled if Stretch is selected in the Image position: drop-down list. The slider function is based on which radio button is picked above the image: • Offset. The sliders move the image in the X or Y direction. • Scale. The sliders scale the image in the X or Y direction. This may distort the image if it is scaled too much in one direction. To prevent distortion, check the Maintain aspect ratio when scaling check box at the bottom of the dialog box. The Reset button is located at the bottom-right corner of the preview pane. Picking this button returns the scale and offset settings to their original values. Once the image is adjusted, pick the OK button to close the Adjust Background Image dialog box. Then, pick the OK button to close the Background dialog box. Sun and Sky If you select Sun & Sky in the Type: drop-down list in the Background dialog box, the Adjust Sun & Sky Background dialog box is displayed. AutoCAD uses the settings in this dialog box to simulate the sun in the sky. This dialog box has a preview tile at the top and the General, Sky Properties, Horizon, Sun disk appearance, Sun Angle Calculator, and Geographic Location categories. The settings in these categories were discussed earlier in the Sun Properties Palette section in this chapter. Once the sky is set, pick the OK button to close the Adjust Sun & Sky Background dialog box. Changing the Background of an Existing View If you need to change the background of an existing named view, open the View Manager dialog box. Select the view name in the Views tree on the left-hand side of the dialog box. Then, in the General category in the middle of the dialog box, select the Background override property. See Figure 18-24. Next, pick the drop-down list for the property and make a selection. Picking None sets the background to the VIEW Ribbon Visualize Named Views View Manager Type VIEW V Select the view Pick to change the background Figure 18-24. Changing the background of an existing, named view.