PNOISE2D

THE BOX'S MAIN HELP:
This function generates 2 dimensional periodic noise.
The return value will be float, point or color depending on the cast,
whose component(s) lie in the range [0,1].

U (input):
This must be a varying float. The default is u.
These are the seeds for the noise function.

V (input):
This must be a varying float.  The default is v.
These are the seeds for the noise function.

PU (input):
This must be an integer. This is the period for the first seed.

PV (input):
This must be an integer. This is the period for the second seed.

OUT (output):
This function generates 2 dimensional periodic noise.
The return value will be float, point or color depending on the cast,
whose component(s) lie in the range [0,1].

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