Bump mapping uses the intensity values (aka the brightness
values) of an image or procedural map to simulate bumpiness on the surface of the model,
without changing the actual topology of the model itself. You can create some surface texture
with a bump map; however, you will not be able to create extreme depth in the model.
For that, you may want to model the surface depth manually or use displacement mapping
instead. To add a bump map to the tire, follow these steps:
1. In the Material Editor, you should have the Wheel Black material selected and the
Maps rollout open from the previous step.
2. Click the None button next to the bump map. In the Material/Map browser, choose
Noise.
Noise is a map of color patterns that is generated procedurally in three dimensions so you
don??™t have to fuss with mapping coordinates. (Mapping coordinates specify the location of
an image on your object, as discussed later in the chapter.)
Figure 7.75
The wheel on the
left has a mapped
reflection, and the
wheel on the right
has a raytraced
reflection.
342 ?– chapter 7: Materials and Mapping
3. When you place the noise map in the bump map slot, you will automatically be taken
to the Parameters for the Noise Map in the Material Editor (shown here).
Pages:
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434