This recipe will show you how to paint a Bump map onto your model. Bump maps can be used to create smaller details that don't call for a normal map. This type of map uses a black and white image where darker values represent surfaces that are farther away, and lighter values represent surfaces that are raised up, relative to the other values.
First off, you will want to import the Rock.obj
file present in the code files of this book. This is the model that we will be using to demonstrate this technique. If you are planning on using your own model for this recipe, then make sure you have your UVs laid out nicely, or you may have stretching and/or resolution inconsistencies. Please note that I used the default Mudbox cube to create this rock, so the UVs are not the best on this model, but do the trick for our purposes.