Chapter 19 Advanced Rendering 517 Copyright Goodheart-Willcox Co., Inc. Current Preset and Preset Information The Current Preset: drop-down list in the Render Presets Manager palette is used to select one of the six standard render presets or a custom render preset. Picking the Create Copy button next to the drop-down list creates a custom preset, as discussed later in this chapter. The entries in the Name: and Description: text boxes in the Preset Info area corre- spond to the currently selected preset in the Current Preset: drop-down list. These entries are read-only when a standard preset is selected. The Name: and Description: text box entries can be edited when creating or editing a custom preset. Render Duration Settings The settings in the Render Duration area allow you to control the duration of the rendering in three different ways. The current setting in this area corresponds to the currently selected preset in the Current Preset: drop-down list. If you select a different radio button when a standard preset is current, a custom preset is created. Creating a custom preset is discussed later in this chapter. The Until Satisfactory setting is used to render without a predefi ned number of processing levels or set time limit. With this setting, you can simply observe the rendering and then cancel when it reaches a point where the quality is good enough. Picking the Cancel Rendering button at the top of the Render window ends processing and allows you to save the image to fi le. The Render By Level: setting is used to set the number of levels that you want AutoCAD to process. Enter a value in the text box or use the slider to set the value. The Render By Time: setting is used to specify the amount of time the rendering takes to complete. Enter the number of minutes in the text box or use the up and down arrows to set the value. Render Accuracy Settings The settings in the Lights and Materials area are used to specify the quality of the rendering based on a specifi c lighting model. The current Render Accuracy: setting corresponds to the currently selected preset in the Current Preset: drop-down list. If you select a different radio button when a standard preset is current, a custom preset is created. Creating a custom preset is discussed in the next section. The Low setting uses the simplifi ed lighting model. This produces quick results but is not very realistic. Refl ections and refractions are limited and global illumination is inactive. Global illumination is discussed later in this chapter. The Draft setting uses the basic lighting model. Global illumination is active and refl ections and refractions are more realistic. Using this setting may be good enough for some situations. The High setting uses the advanced lighting model. This takes longer to complete, but produces the most realistic results. Global illumination is active and refl ections and refractions are calculated at a high level. Creating a Custom Render Preset Custom render presets are created in the Render Presets Manager palette. The six standard presets can be used as a starting point when creating a custom render preset. Set the appropriate preset current and then pick the Create Copy button next to the Current Preset: drop-down list. The name of the new preset appears in the Current Preset: drop-down list in the format Name-Copy n with n representing an incremental number. Use the Name: and Description: text boxes to change the default name and description. Then, adjust the rendering settings as desired. The new custom render preset is available in the Current Preset: drop-down list and in the Render Presets drop-down list in the Render panel on the Visualize tab of the ribbon.