This function generates 3 dimensional 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 noise function.

This must be an integer. The default is 1.0.
This is the time interval for the noise function.

This function generates 4 dimensional 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].