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#### Spherical

The `spherical` pattern creates a one unit radius sphere along the Y axis. It is computed by:

value = 1.0-min(1, sqrt(X^2 + Y^2 + Z^2))

It starts at 1.0 at the origin and increases to a max value of 0.0 as it approaches a distance of 1 unit from the origin in any direction. It remains at 0.0 for all areas beyond that distance. This pattern was originally created for use with `halo` or `media` but it may be used anywhere any pattern may be used.

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