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The rendering methods you’ve learned so far can be of enormous help in your design effort. Simply being able to see how the sun affects your design can be of enormous help in selling your ideas or helping get plans through a tough planning board review. But the look of the building is still somewhat cartoohish. You can further enhance the rendering by adding materials to the objects in your

Let’s suppose you want a granite-like finish to appear on the Facade model. You will also want the building next to the Facade model to appear as a glass tower. The first step to adding materials is to acquire the materials from AutoCAD’s materials library.

1. Choose View» Render» Materials or clickMaterials on the Render toolbar.

The Materials dialog box appears ..

2. Click the Materials Library button in the middle of the dialog box. The Materials Library dialog box appears.

3.In the Library List box, find and select Granite Pebbles so it is highlighted. This is the material you will assign to the facade.
4. Click the Preview button in the middle of the dialog box. A view of the material appears on a sphere giving you an idea of what the material looks like.
5. Click the Import button. Notice that Granite Pebbles now appears in the Materials List box to the left. This list box shows the materials you’ve transferred to your drawing.
6. Now locate Glass in the Library List to the right and select it. Click the Preview button again to see what it looks like. Notice that the preview shows a transparent sphere showing some reflected light. You may notice a textured effect caused by the low color resolution of the display.

7. Click the Import button again to make Glass available in the drawing then click OK to exit the Materials Library dialog box.

Once you’ve acquired the materials, you will have to assign them to objects in your drawing.
1. In the Materials dialog box highlight the Granite Pebbles item shown it the list to the left and then click the Attach-e button in the right half of the dialog box. The dialog box temporarily disappears, allowing you to select the objects you want to appear as Granite Pebbles.
2. Click the Facade model, including the steps, columns, and arched entrance and then press -1. After a moment the Materials dialog box appears again.
3. Click Glass on the Materials list box.
4. This time you’ll assign a material based on its . Click the By Layer button to the right of the dialog box. The Attach by Layer dialog box appears

5.Shift+click Glass and Dk glass from the Select Layer list to the right and then click the Attach button. Notice that the word glass now appears next to the layer names you selected indicating that the Glass material is now associated with those layers.
6.Click OK to exit the Attach by Layer dialog box; then click OK again to exit the Materials dialog box.
7.Now render your model. You may want to take a break at this point as the rendering will take a few minutes. When AutoCAD is done your rendering will look like Figure 17.7.

Adjusting the Materials’ Appearance

The Facade model looks more like it has an Army camouflage paint job instead of a granite finish. Also the glass of the office tower is a bit too transparent. Fortunately you can make several adjustments to the materials. You will want to reduce the scale of the granite pebbles’ material so it is in line with the scale of the model. You will
also want to darken the glass material so it looks more like the tinted glass used in modem office buildings. You’ll start with the granite pebbles.

1. Choose View> Render> Materials.
2. In the Materials dialog box select Granite Pebbles from the Materials list and then click the Modify button. The Modify Granite Material dialog box appears.

3. Click the Scale radio button in the Attributes button group in the left-hand  side of the dialog box.
4. Change the Value input box near the top of the dialog box from .398 to .010.
This reduces the scale of the material.
5. Click OK to return to the Materials dialog box.

The Modify Granite Material dialog box offers a variety of options that let you control reflectivity roughness color transparency and of course scale. The Help button in the Modify Granite Material dialog box provides a brief description of these options. As you’ll see when you continue with the next exercise not all materials have the same options.

1. Select Glass from the Materials list and then click the Modify button again. The Modify Material dialog box appears.

Notice that this dialog box offers a slightly different set of Attributes optionS than those offered in the Modify Granite Material dialog box you edited in the previous exercise.

2.Select the Transparency radio button in the Attributes button group and then adjust the Value option downward to .55. This has the effect of darkening the glass.
3.Select the Color Pattem radio button then in the Color button group adjust the Red value to 69 the Green value to 60 and the Blue to .58. This gives the glass a bronze tint.
4.Select Cube from the drop-down list just befow the Preview button and then click the Preview button to get a preview of the color settings.
5.Click OK in both the Modify Standard Material and Materials dialog boxes to exit them.
6.Render the view with the new material settings. After a few minutes your view will look something like Figure 17.8.

There are four basic types of materials: Standard, Marble, Granite, and Wood. Each type has its own set of characteristics that you can adjust. You can even create new materials based on one of the four primary types of materials. Now let’s continue by making another adjustment to the material settings.

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