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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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