Calculates the second order derivatives at the given parameter values on the surface.
| Name | Type | Description |
| Params | Double | Input/output array of Doubles that specifies the parameters. |
| UUPartials | Double | Output Double array that returns the second U partial derivatives. |
| UVPartials | Double | Output Double array that returns the second mixed UV partial derivatives. |
| VVPartials | Double | Output Double array that returns the second V partial derivatives. |