Reference:Discontinuous Patterns
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Some patterns are discontinuous, meaning their slope is infinite. These patterns are not suitable for use as object normals. These patterns work best with textures and media:
Note: The cells
and crackle
patterns are mixed cases in that they are discontinuous at their respective boundaries. However, there is no limit to the different number of values, in the range of 0 to 1, that they can generate. When using the solid
keyword with the crackle
pattern it becomes discontinuous. The pavement
and tiling
patterns are also discontinuous at their respective boundaries, while other portions ramp.