Rendering and Materials - AutoCAD 2011 and AutoCAD LT 2011: No Experience Required - page 939

FiGuRE 17.30 View of the cabin using the Realistic visual style

Adding texture

The exterior walls of the cabin consist of flat surfaces, and there are no features
that would cause shadows to be cast. The Bump Map option adds apparent tex-
ture by adding shadows where they would appear if the surfaces had texture. In
the Maps rollout, you can see that only the Diffuse Map option is checked, mean-
ing that no map is used to define the opacity and bump features of the material.
Opacity maps and bump maps don't use any of the color information from an
image map, but this doesn't mean that color maps can't be used—only that the
grayscale equivalent of the colors will be interpreted by AutoCAD.

1. Open the Materials Editor palette once again by locating the Shakes
Weathered material in the Materials Browser palette.

2. Select the check box next to the Bump group heading in the Materials
Browser.

3. In the Bump area, click the Select Image button to open the Select
Image File dialog box. It should open to the C:\Program Files\Common
Files\Autodesk Shared\Materials2011\assetlibrary_base.fbm\3\
Mats folder; if not, navigate there.

the Thermal -
Moisture.Shakes
.Weathered.jpg
image is also included
in the Chapter 17
download.

4. Select the Thermal - Moisture.Shakes.Weathered.jpg file, the
same file used as the diffuse map, and then click Open.

5. Move the Bump Amount slider to 10 (see Figure 17.31).
Figure 17.32 shows the cabin rendered with the new material
parameters.

O