NOISE_GRAD2D

THE BOX'S MAIN HELP:

This function generates two-dimensional noise.
U and V are the scalar seeds for the noise function.
GU and GV will contain the gradient of the computed texture at U,V.
The return value is a scalar which lies in the range [0,1].

U (input):

This must be a scalar.  
These are the seeds for the noise function.

V (input):

This must be a scalar.  
These are the seeds for the noise function.

GU (output):

This scalar contains the gradient of the computed texture at U.

GV (output):

This scalar contains the gradient of the computed texture at V.

OUT (output):

This function generates two-dimensional noise.
The return value is a scalar which lies in the range [0,1].

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