bumps pattern was originally designed only to be used as
a normal pattern. It uses a very smooth, random noise function that creates
the look of rolling hills when scaled large or a bumpy orange peel when
scaled small. Usually the bumps are about 1 unit apart.
When used as a normal pattern, this pattern uses a specialized normal
perturbation function. This means that the pattern cannot be used with
slope_map or wave type modifiers in a
When used as a pigment pattern or texture pattern, the
pattern is identical to
spotted and is
similar to normal bumps but is not identical as are most normals when
compared to pigments.
Note: The appearance of the bumps pattern depends on the noise generator used.
The default type is 2. This may be changed using the
noise_generator keyword. See the section Pattern Modifiers: noise_generator.