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#### Radial

The `radial` pattern is a radial blend that wraps around the +y-axis. The color for value 0.0 starts at the +x-direction and wraps the color map around from east to west with 0.25 in the -z-direction, 0.5 in -x, 0.75 at +z and back to 1.0 at +x. Typically the pattern is used with a `frequency` modifier to create multiple bands that radiate from the y-axis. For example:

      pigement {

        radial color_map{[0.5 Black][0.5 White]}

        frequency 10

      }

creates 10 white bands and 10 black bands radiating from the y axis.

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