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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