PNOISE3D

THE BOX'S MAIN HELP:
This function generates 3 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].

PP (input):
This must be a varying point. The default is the surface point, P.
This is the seed for the pnoise function.

IP (input):
This must be a point which lies on the interger lattice. 
(i.e. all components must be intergers)
This is the period for the function. The default is point(1,1,1).

OUT (output):
This function generates 3 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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