Reference:Wrinkles Pattern

The wrinkles pattern was originally designed only to be used as a normal pattern. It uses a 1/f noise pattern similar to granite but the features in wrinkles are sharper. The pattern can be used to simulate wrinkled cellophane or foil. It also makes an excellent stucco texture.

When used as a normal pattern, this pattern uses a specialized normal perturbation function. This means that the pattern cannot be used with normal_map, slope_map or wave type modifiers in a normal statement.

When used as a pigment pattern or texture pattern, the wrinkles pattern is similar to normal wrinkles but is not identical as are most normals when compared to pigments.

Note: The appearance of the wrinkles 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.