Project: Refining the Materials
Thus far, you've created custom color, transparency, reflectivity, and incandescence bitmaps for the majority of surfaces in the ambulance scene. Although this has provided a suitable render, you can continue to refine the various materials. In particular, the addition of bump maps and specular maps will increase the realism. In addition, you can add greater variation to the surfaces by duplicating materials and adjusting the attributes of the duplicates.
Adding Bump Maps
Bump maps can add missing roughness to a surface. Whereas displacement maps displace the positions of surface vertices, bump maps simply perturb surface normals at the point of render. This makes bump maps very efficient. Hence, you can add bump ...