DPDTIME

THE BOX'S MAIN HELP:

dPdtime is the vector indicating how the surface point P is 
changing over time, as indicated by motion blur in the scene. 
This is similar to how dPdu and dPdv give the rate of change 
in P over u and v, respectively.

DPDT (output):

dPdtime is the vector indicating how the surface point P is 
changing over time, as indicated by motion blur in the scene. 
This is similar to how dPdu and dPdv give the rate of change 
in P over u and v, respectively.

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