This function generates 4 dimensional periodic noise.
The return value will be float, point, vector, normal or color 
depending on the cast, whose component(s) lie in the range [0,1].

This must be a varying point, vector or normal.
The default is the surface point, P.
This is the seed for the pnoise function.

This must be an integer. The default is 1.
This is the time interval for the seed of the pnoise function.

This must be a point, vector or normal which lies on the 
integer lattice. (i.e. all components must be integers)
This is the period for the function. The default is point(1,1,1).

This must be an integer. The default is 1.
This is the time interval for the period of the pnoise function.

This function generates 4 dimensional periodic noise.
The return value will be float, point, vector, normal or color 
depending on the cast, whose component(s) lie in the range [0,1].