FaceSecondDerivatives Properties
| Name | Return Type | Description |
|---|---|---|
| IsValidObject | Boolean | Specifies whether the .NET object represents a valid Revit entity. |
| MixedDerivative | XYZ | The mixed derivative. |
| UUDerivative | XYZ | The second derivative with respect to U. |
| VVDerivative | XYZ | The second derivative with respect to V. |