DUDV

THE BOX'S MAIN HELP:

This vector represents the rate of change in the surface 
with respect to u and v.  A vector is returned only for free-form 
surface objects, for polygonal objects the vector is null.

du (output):

This vector represents the rate of change in the surface 
with respect to u.  A vector is returned only for free-form 
surface objects, for polygonal objects the vector is null.

dv (output):

This vector represents the rate of change in the surface 
with respect to v.  A vector is returned only for free-form 
surface objects, for polygonal objects the vector is null.

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